diff --git a/DataStructure/queue.py b/DataStructure/queue.py
index def1c7f..014f1a0 100644
--- a/DataStructure/queue.py
+++ b/DataStructure/queue.py
@@ -1,19 +1,19 @@
 #function to add element at the end of list
-def add_element(stack,x):
-    stack.append(x)
+def add_element(queue,x):
+    queue.append(x)
 #function to remove last element from list    
-def delete_element(stack):
-    n = len(stack)
+def delete_element(queue):
+    n = len(queue)
     if(n<=0):
         print("Queue empty....Deletion not possible")
     else:
-        del(stack[0])
+        del(queue[0])
 
-#function to display stack entry
-def display(stack):
-    if len(stack)<=0:
+#function to display queue entry
+def display(queue):
+    if len(queue)<=0:
         print("Queue empty...........Nothing to display")
-    for i in stack:
+    for i in queue:
         print(i,end=" ")
 #main program starts from here 
 x=[]
diff --git a/ModuleExamples/createModule.py b/ModuleExamples/createModule.py
new file mode 100644
index 0000000..5733b43
--- /dev/null
+++ b/ModuleExamples/createModule.py
@@ -0,0 +1,23 @@
+def hello():
+    for x in range(10):
+        print('hello', x, end =" ")
+
+def sum_digit(n):
+    sum1 = 0
+    while n!=0:
+        sum1 += n%10
+        n = n//10
+    return sum1
+
+def simple_interest(p,r,t):
+    return p*r*t/100
+
+def area_triangle(base,height):
+    return base*height
+
+def isPrime(n):
+    found =0
+    for x in range(2,(n//2)+1):
+        if n%x==0:
+            found=1
+    return found
\ No newline at end of file
diff --git a/ModuleExamples/module_call.py b/ModuleExamples/module_call.py
new file mode 100644
index 0000000..6868849
--- /dev/null
+++ b/ModuleExamples/module_call.py
@@ -0,0 +1,8 @@
+from createModule import isPrime
+
+
+result = isPrime(11)
+if result ==0:
+    print('Prime Number')
+else:
+    print('Not a prime Number')
\ No newline at end of file
diff --git a/assignment_generator.py b/assignment_generator.py
index 45b3799..6a46122 100644
--- a/assignment_generator.py
+++ b/assignment_generator.py
@@ -1,3 +1,4 @@
+
 import random
 
 unique=[]
@@ -40,4 +41,4 @@
         if(counter>=6):
             break
         
-    print(string)
\ No newline at end of file
+    print(string)
diff --git a/delete_record.py b/delete_record.py
new file mode 100644
index 0000000..497c4af
--- /dev/null
+++ b/delete_record.py
@@ -0,0 +1,29 @@
+import csv
+name = input('Name to delete :')
+# this is comment
+# hello rakesh this is comment
+""" this is multi line commnet"""
+
+records=[]
+found =0
+file = open("student.csv","r")
+reader = csv.DictReader(file)
+for record in reader:
+    record = dict(record)
+    if(record['name']!=name):
+        records.append(dict(record)) 
+    else:
+        found =1
+file.close()
+# Remove the old file and create a new csv file
+headers=['rollno','name','stream','fees']
+file = open("student.csv","w")
+writer = csv.DictWriter(file,fieldnames =headers, lineterminator ='\n') 
+writer.writeheader()
+writer.writerows(records)
+file.close()
+
+if(found==0):
+    print(name, " does not exists")
+else:
+    print(name," deleted successfully")
diff --git a/fileHandling/Create_binary_file.py b/fileHandling/Create_binary_file.py
index 3b23355..b9419b4 100644
--- a/fileHandling/Create_binary_file.py
+++ b/fileHandling/Create_binary_file.py
@@ -3,16 +3,16 @@
 #   Compiled on     : 27-Nov-2019
 
 import pickle
-list = []
+list1 = []
 while True:
     roll = input("Enter student Roll No:")
     sname = input("Enter student Name :")
     student = {"roll": roll, "name": sname}
-    list.append(student)
+    list1.append(student)
     choice = input("Want to add more record(y/n) :")
     if(choice == 'n'):
         break
 
 file = open("student.dat", "wb")
-pickle.dump(list, file)
+pickle.dump(list1, file)
 file.close()
diff --git a/fileHandling/Update_binary_file_record.py b/fileHandling/Update_binary_file_record.py
index 5d9893d..d235d19 100644
--- a/fileHandling/Update_binary_file_record.py
+++ b/fileHandling/Update_binary_file_record.py
@@ -4,8 +4,7 @@
 
 import pickle
 
-name = input('Enter name that you want to update in binary file :')
-
+name = input('Name to update :')
 file = open("student.dat", "rb+")
 list = pickle.load(file)
 
diff --git a/fileHandling/binary_files/create_bn.py b/fileHandling/binary_files/create_bn.py
new file mode 100644
index 0000000..3ee7385
--- /dev/null
+++ b/fileHandling/binary_files/create_bn.py
@@ -0,0 +1,13 @@
+import pickle
+rec=[]
+while True:
+    roll= int(input('Enter Name :'))
+    name=input('Enter your Name : ')
+    record = [roll, name]
+    rec.append(record)
+    choice=input('Add More(Y/N ) ? ')
+    if choice.upper() == 'N':
+         break
+f = open("student", "wb")
+pickle.dump(rec, f)
+f.close()
diff --git a/fileHandling/csv Files/AddRecord.py b/fileHandling/csv Files/AddRecord.py
new file mode 100644
index 0000000..0940960
--- /dev/null
+++ b/fileHandling/csv Files/AddRecord.py	
@@ -0,0 +1,15 @@
+import csv
+
+rollno= int(input('Roll No :'))
+name  = input('Name :')
+stream = input('Stream :')
+fees =  int(input('Fees :'))
+
+records = [rollno,name,stream,fees]
+
+f = open("student.csv", "a")
+csvwriter = csv.writer(f, lineterminator='\n')
+# csvwriter.writerow(header)
+csvwriter.writerow(records)
+f.close()
+print("Record added ...")
diff --git a/fileHandling/csv Files/deleteRecord_readerWriter.py b/fileHandling/csv Files/deleteRecord_readerWriter.py
new file mode 100644
index 0000000..3332767
--- /dev/null
+++ b/fileHandling/csv Files/deleteRecord_readerWriter.py	
@@ -0,0 +1,24 @@
+# program to update a record in csv file
+import csv
+name = input('Name to Delete :')
+records = []
+found = 0
+file = open("student.csv", "r")
+reader = csv.reader(file)
+for record in reader:
+    if(record[1]!= name):
+        records.append(record)
+        found = 1
+    
+file.close()
+
+# Remove the old file and create a new csv file
+file = open("student.csv", "w")
+writer = csv.writer(file,lineterminator='\n')
+writer.writerows(records)
+file.close()
+
+if(found == 0):
+    print(name, " does not exists")
+else:
+    print(name, " deleted successfully")
diff --git a/fileHandling/csv Files/read_file.py b/fileHandling/csv Files/read_file.py
new file mode 100644
index 0000000..e69de29
diff --git a/fileHandling/csv Files/readcsvFile.py b/fileHandling/csv Files/readcsvFile.py
new file mode 100644
index 0000000..fc08f76
--- /dev/null
+++ b/fileHandling/csv Files/readcsvFile.py	
@@ -0,0 +1,6 @@
+import csv
+f = open(r"C:\Users\rakesh\Desktop\student.csv", "r")
+data = csv.reader(f)
+for record in data:
+    print(record)
+f.close()
diff --git a/fileHandling/csv Files/readcsvUsingDictReader.py b/fileHandling/csv Files/readcsvUsingDictReader.py
new file mode 100644
index 0000000..83b0f46
--- /dev/null
+++ b/fileHandling/csv Files/readcsvUsingDictReader.py	
@@ -0,0 +1,6 @@
+import csv
+f = open(r"C:\Users\rakesh\Desktop\student.csv", "r")
+data = csv.DictReader(f)
+for record in data:
+    print(dict(record))
+f.close()
diff --git a/fileHandling/csv Files/search_record.py b/fileHandling/csv Files/search_record.py
new file mode 100644
index 0000000..5ea0b55
--- /dev/null
+++ b/fileHandling/csv Files/search_record.py	
@@ -0,0 +1,15 @@
+import csv
+name = input('Name to Search :')
+
+file = open('student.csv','r')
+reader = csv.DictReader(file)
+found =0
+for x in reader:
+    x = dict(x)
+    if(x['name']==name):
+        print(name,' found in CSV file..')
+        found =1
+file.close()
+
+if(found == 0):
+    print(name, ' not found....')
\ No newline at end of file
diff --git a/fileHandling/csv Files/search_record_reader.py b/fileHandling/csv Files/search_record_reader.py
new file mode 100644
index 0000000..4cfc91a
--- /dev/null
+++ b/fileHandling/csv Files/search_record_reader.py	
@@ -0,0 +1,14 @@
+import csv
+name = input('Name to Search :')
+
+file = open('student.csv', 'r')
+reader =csv.reader(file)
+found = 0
+for x in reader:
+    if(x[1] == name):
+        print(name, ' found in CSV file..')
+        found = 1
+file.close()
+
+if(found == 0):
+    print(name, ' not found....')
diff --git a/fileHandling/csv Files/tempCodeRunnerFile.py b/fileHandling/csv Files/tempCodeRunnerFile.py
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/fileHandling/csv Files/tempCodeRunnerFile.py	
@@ -0,0 +1 @@
+
diff --git a/fileHandling/csv Files/updateCSV.py b/fileHandling/csv Files/updateCSV.py
new file mode 100644
index 0000000..c34da99
--- /dev/null
+++ b/fileHandling/csv Files/updateCSV.py	
@@ -0,0 +1,31 @@
+# program to update a record in csv file
+import csv
+name = input('Name to Update :')
+records = []
+found = 0
+file = open("student.csv", "r")
+reader = csv.DictReader(file)
+for record in reader:
+    record = dict(record)
+    if(record['name'] == name):
+        record = dict(record)
+        record['name'] =input('New Name:')
+        records.append(record)
+        found=1
+    else:
+        records.append(dict(record))
+file.close()
+
+# Remove the old file and create a new csv file
+pr
+headers = ['rollno', 'name', 'stream', 'fees']
+file = open("student.csv", "w")
+writer = csv.DictWriter(file, fieldnames=headers, lineterminator='\n')
+writer.writeheader()
+writer.writerows(records)
+file.close()
+
+if(found == 0):
+    print(name, " does not exists")
+else:
+    print(name, " updated successfully")
diff --git a/fileHandling/csv Files/writeCSVFile.py b/fileHandling/csv Files/writeCSVFile.py
new file mode 100644
index 0000000..b390e3e
--- /dev/null
+++ b/fileHandling/csv Files/writeCSVFile.py	
@@ -0,0 +1,15 @@
+import csv
+records =[ 
+    ["ID", "name", "Price", "Qty"],
+          ["102","LG Monitor","6500","20"],
+          ["103","KeyBoard","1350","156"],
+          ["105","Hp Mouse","650","120"],
+          ["106","Speaker","1670","136"]
+]
+
+f = open("stock.csv","w")
+csvwriter = csv.writer(f,lineterminator="\n")
+# csvwriter.writerow(header)
+csvwriter.writerows(records)
+f.close()
+print("Check your file now....")
diff --git a/fileHandling/csv Files/writeCsvDictWriter.py b/fileHandling/csv Files/writeCsvDictWriter.py
new file mode 100644
index 0000000..99cfb7d
--- /dev/null
+++ b/fileHandling/csv Files/writeCsvDictWriter.py	
@@ -0,0 +1,15 @@
+import csv
+headers =['rollno','name','stream','fees']
+records = [
+    {'fees': 2356,'rollno': 12, 'name': 'surendra', 'stream': 'Humanities', },
+    {'rollno': 13, 'stream': 'Humanities', 'fees': 2356,'name': 'Ashok', },
+    {'rollno':15,'name':'Nipun','stream':'Humanities','fees':2356},
+    {'rollno': 22, 'name': 'Ayush Negi', 'fees': 2356,'stream': 'Science', },
+]
+
+f = open("student.csv", "w")
+writer = csv.DictWriter(f, fieldnames = headers, lineterminator='\n')
+writer.writeheader()
+writer.writerows(records)
+f.close()
+print("Check your file now....")
diff --git a/fileHandling/csvReader.py b/fileHandling/csvReader.py
index a20fa03..273db00 100644
--- a/fileHandling/csvReader.py
+++ b/fileHandling/csvReader.py
@@ -1,3 +1,5 @@
+
+
 import csv
 import xlwt
 from tabulate import tabulate
diff --git a/fileHandling/read_binary_file.py b/fileHandling/read_binary_file.py
index 4faf422..becf9fc 100644
--- a/fileHandling/read_binary_file.py
+++ b/fileHandling/read_binary_file.py
@@ -6,5 +6,6 @@
 
 file = open("student.dat", "rb")
 list = pickle.load(file)
-print(list)
+for x in list:
+    print(x['roll'],x['name'])
 file.close()
diff --git a/fileHandling/search_in_binary_file.py b/fileHandling/search_in_binary_file.py
index b6139f1..cef43b9 100644
--- a/fileHandling/search_in_binary_file.py
+++ b/fileHandling/search_in_binary_file.py
@@ -3,15 +3,13 @@
 #   Compiled on     : 8-July-2018
 
 import pickle
-
-name = input('Enter name that you want to search in binary file :')
-
+name = input('Name  to search :')
 file = open("student.dat", "rb")
-list = pickle.load(file)
+list1 = pickle.load(file)
 file.close()
 
 found = 0
-for x in list:
+for x in list1:
     if name in x['name']:
         found = 1
 print("Found in binary file" if found == 1 else "Not found")
diff --git a/matplotlib/bar_Graph.py b/matplotlib/bar_Graph.py
index 6851d0b..a61f819 100644
--- a/matplotlib/bar_Graph.py
+++ b/matplotlib/bar_Graph.py
@@ -1,11 +1,12 @@
 # program to print bar graph on the screen
 # made by        : rakesh kumar
 
+import numpy as np
 import matplotlib.pyplot as plt
-x = ['Delhi', 'Banglore', 'Chennai', 'Pune']
-y = [250, 300, 260, 400]
+city = ['Delhi', 'Banglore', 'Chennai', 'Pune']
+sales = [250, 300, 260, 400]
 plt.xlabel('City')
 plt.ylabel('Sales in Million')
 plt.title('Sales Recorded in Major Cities')
-plt.bar(x, y)
+plt.bar(city, sales)
 plt.show()
diff --git a/matplotlib/box_plot1.py b/matplotlib/box_plot1.py
new file mode 100644
index 0000000..0b80b7d
--- /dev/null
+++ b/matplotlib/box_plot1.py
@@ -0,0 +1,5 @@
+import matplotlib.pyplot as plt
+x = [1, 3, 4, 7, 8, 8, 9]
+plt.boxplot(x)
+plt.grid()
+plt.show()
diff --git a/matplotlib/box_plot2.py b/matplotlib/box_plot2.py
new file mode 100644
index 0000000..cba19fc
--- /dev/null
+++ b/matplotlib/box_plot2.py
@@ -0,0 +1,7 @@
+import matplotlib.pyplot as plt
+list1 = [10, 33, 43, 74, 84, 8, 9,35,63,5,3,67,8,78,35,2,57,7,78,34,67,34]
+list2 = [23,3,5,67,67,78,98,90,100,12,45,67,89,45,56,78,9,23,69,56,23,5]
+plt.boxplot([list1,list2],labels=['Girls','Boys'])
+plt.grid()
+plt.legend()
+plt.show()
diff --git a/matplotlib/boxplot.py b/matplotlib/boxplot.py
new file mode 100644
index 0000000..3c85a31
--- /dev/null
+++ b/matplotlib/boxplot.py
@@ -0,0 +1,8 @@
+import matplotlib.pyplot as plt
+import numpy as np
+import numpy as np
+x = np.arange(1,100)
+y = np.arange(101,200)
+z=  np.arange(201,250)
+plt.boxplot([x,y,z])
+plt.show()
\ No newline at end of file
diff --git a/matplotlib/frequency_polygon.py b/matplotlib/frequency_polygon.py
index d820b59..7ddb20b 100644
--- a/matplotlib/frequency_polygon.py
+++ b/matplotlib/frequency_polygon.py
@@ -1 +1,22 @@
 import matplotlib.pyplot as plt
+<<<<<<< HEAD
+=======
+from numpy import linspace,pi,sin,cos,tan
+
+#multiple figures
+data=[1,2,3,4,5,
+      10,11,12,14,15,18,16,14,13,12,19,20,16,14,19,
+      22, 21, 22, 23, 24, 25, 23, 26, 28, 26,27,25,28,29,30, 
+      32,33,37,38,38,39,34,36,
+      42,43,45,46,48,46,49,50,43,42,44,45,47,49,50,49,48,42,46,41,45,46,48,45,44,
+      51,52,54,55,53,58,57,59,60,52,51,54,53
+      ]
+frequency = [5,15,18,8,25,13]
+x = [5,15,25.5,35.5,45.5,55.5]
+
+
+plt.figure(1)
+plt.hist(data,bins=[0,10,20,30,40,50,60],color="green")
+plt.scatter(frequency,x)
+plt.show()
+>>>>>>> da25a2a32ac30d0980ed6d1d3ad58008d8ff0b21
diff --git a/matplotlib/histogram.py b/matplotlib/histogram.py
new file mode 100644
index 0000000..4f78063
--- /dev/null
+++ b/matplotlib/histogram.py
@@ -0,0 +1,11 @@
+import matplotlib.pyplot as plt
+sugar_men = [121,153,243,33,95,138,339,150,252,156,143,118]
+sugar_women = [67,101,120,135,180,125,68,95,92,102,47,78,135,225]
+sugar_child =[120,89,123,145,100,89,135,120,102,125,123,170,180]
+plt.hist([sugar_men, sugar_women,sugar_child], bins=[100, 130, 150, 200],
+         rwidth=0.80, color=['green', 'orange','purple'], label=['Men', 'Women', 'children'])
+plt.legend()
+plt.xlabel('Sugar Readings')
+plt.ylabel('No of Patient')
+plt.title('Sugar Patient Stats')
+plt.show()
diff --git a/matplotlib/histogram1.py b/matplotlib/histogram1.py
new file mode 100644
index 0000000..86b0bfb
--- /dev/null
+++ b/matplotlib/histogram1.py
@@ -0,0 +1,4 @@
+import matplotlib.pyplot as plt
+x=[12, 15, 23, 33, 35, 38, 39, 50, 52, 56, 43, 18]
+plt.hist(x, bins=[10, 20, 30, 40, 50, 60],color="red",rwidth=0.80)
+plt.show()
\ No newline at end of file
diff --git a/matplotlib/line_graph.py b/matplotlib/line_graph.py
index fc06b90..786ce57 100644
--- a/matplotlib/line_graph.py
+++ b/matplotlib/line_graph.py
@@ -1,12 +1,13 @@
-# program to print scatter graph on the screen
+# program to print line graph on the screen
 # made by        : rakesh kumar
 
 import matplotlib.pyplot as plt
 import numpy as np
-x = ['Delhi', 'Banglore', 'Chennai', 'Pune']
-y = [250, 300, 260, 400]
-plt.xlabel('City')
-plt.ylabel('Sales in Million')
-plt.title('Sales Recorded in Major Cities')
+x = ['week-1', 'week-2', 'week-3', 'week-4',"Week-6","Week-6","week-7","week-8"]
+y = [1250, 1300, 1260, 1400,2420,3180,6550,1220]   
 plt.plot(x, y)
+plt.xlabel('Week wise Sales')
+plt.ylabel('No of Unit Sold')
+plt.title('Sales of Electronics in Deepawali')
+plt.grid()
 plt.show()
diff --git a/matplotlib/multiple_bar2.py b/matplotlib/multiple_bar2.py
new file mode 100644
index 0000000..ce4185f
--- /dev/null
+++ b/matplotlib/multiple_bar2.py
@@ -0,0 +1,16 @@
+import matplotlib.pyplot as plt
+import numpy as np
+
+girls =(79,67,82)
+boys = (89,78,56)
+y_pos = np.arange(3)
+
+width=0.30
+
+plt.bar(width+y_pos,girls,width,color='r',label="Girls")
+plt.bar(2*width+y_pos,boys,width,color='green',label="boys")
+
+plt.xlabel('Students')
+plt.ylabel('Marks')
+plt.legend()
+plt.show()
diff --git a/matplotlib/multiple_barGraph.py b/matplotlib/multiple_barGraph.py
new file mode 100644
index 0000000..597b72f
--- /dev/null
+++ b/matplotlib/multiple_barGraph.py
@@ -0,0 +1,28 @@
+import matplotlib.pyplot as plt
+import numpy as np
+
+names = ["Arushi","Pratham","Mannat"]
+marks1 = (82, 80, 63)
+marks2 = (98,  73,  30)
+marks3  =(78,87,45)
+marks4  =(99,92,90)
+final = (99,67,78)
+
+x = np.arange(len(marks1))
+width = 0.15
+
+fig, axes = plt.subplots(ncols=1, nrows=1)
+
+axes.bar(x, marks1, width, align='edge',color="orange", label="UT-1")
+axes.bar(x+width, marks2, width, align='edge', color='purple', label="UT-2")
+axes.bar(x+2*width, marks3, width, align='edge', color='green', label="Half Yearly")
+axes.bar(x+3*width, marks4, width, align='edge', color='red', label="PreBoard")
+axes.bar(x+4*width, final, width, align='edge', color='blue', label="Final")
+
+axes.set_xticks(x)
+axes.set_xticklabels(names)
+plt.xlabel('Student Names')
+plt.ylabel('Marks Obtained')
+plt.title('Student Performance')
+plt.legend()
+plt.show()
\ No newline at end of file
diff --git a/matplotlib/multiple_graph.py b/matplotlib/multiple_graph.py
new file mode 100644
index 0000000..eeb81cb
--- /dev/null
+++ b/matplotlib/multiple_graph.py
@@ -0,0 +1,14 @@
+import matplotlib.pyplot as plt
+plt.figure(1)                # the first figure
+plt.subplot(211)             # the first subplot in the first figure
+plt.plot([1, 2, 3])
+plt.subplot(212)             # the second subplot in the first figure
+plt.plot([4, 5, 6])
+plt.figure(2)                # a second figure
+plt.plot([4, 5, 6])            # creates a subplot(111) by default
+plt.figure(1)                # figure 1 current; subplot(212) still current
+plt.subplot(211)             # make subplot(211) in figure1 current
+plt.title('Easy as 1,2,3')   # subplot 211 title
+plt.subplot(212)
+plt.title('second plot title')
+plt.show()
\ No newline at end of file
diff --git a/matplotlib/multiple_line.py b/matplotlib/multiple_line.py
new file mode 100644
index 0000000..e543ecb
--- /dev/null
+++ b/matplotlib/multiple_line.py
@@ -0,0 +1,17 @@
+import matplotlib.pyplot as plt
+
+names =("rakesh","mannat","pratham","pushkar")
+mark1 =(56,78,56,34)
+mark2 =(78,58,45,89)
+mark3= (90,78,89,56)
+
+plt.plot(names,mark1,label="UT-1")
+plt.plot(names,mark2,label="UT-2")
+plt.plot(names,mark3,label="UT-3")
+
+plt.grid(True)
+plt.xlabel('Names')
+plt.ylabel('Marks')
+plt.title('Student Performance')
+plt.legend()
+plt.show()
diff --git a/matplotlib/scatter_graph.py b/matplotlib/scatter_graph.py
index 3c85a31..28e60bb 100644
--- a/matplotlib/scatter_graph.py
+++ b/matplotlib/scatter_graph.py
@@ -1,8 +1,7 @@
 import matplotlib.pyplot as plt
-import numpy as np
-import numpy as np
-x = np.arange(1,100)
-y = np.arange(101,200)
-z=  np.arange(201,250)
-plt.boxplot([x,y,z])
+x = [5, 7, 8, 7, 2, 17, 2, 9, 4, 11, 12, 9, 6]
+y = [99, 86, 87, 88, 111, 86, 103, 87, 94, 78, 77, 85, 86]
+
+plt.scatter(x,y)
+plt.grid()
 plt.show()
\ No newline at end of file
diff --git a/matplotlib/scatter_graph_random_dots.py b/matplotlib/scatter_graph_random_dots.py
new file mode 100644
index 0000000..3bfce11
--- /dev/null
+++ b/matplotlib/scatter_graph_random_dots.py
@@ -0,0 +1,8 @@
+import numpy
+import matplotlib.pyplot as plt
+
+x = numpy.random.normal(5.0, 1.0, 1000)
+y = numpy.random.normal(10.0, 2.0, 1000)
+
+plt.scatter(x, y)
+plt.show()
diff --git a/matplotlib/simpleplt.py b/matplotlib/simpleplt.py
index 9cfe747..3099d40 100644
--- a/matplotlib/simpleplt.py
+++ b/matplotlib/simpleplt.py
@@ -1,3 +1,12 @@
 import matplotlib.pyplot as plt
+<<<<<<< HEAD
 plt
 plt.show()
+=======
+import numpy as np
+x = np.linspace(0,2.0*np.pi,101)
+# print(x)
+y = np.sin(x)
+plt.plot(x,y,color="red",linestyle="--",linewidth="5")
+plt.show()
+>>>>>>> da25a2a32ac30d0980ed6d1d3ad58008d8ff0b21
diff --git a/matplotlib/stacked_bar_graph.py b/matplotlib/stacked_bar_graph.py
new file mode 100644
index 0000000..64b2039
--- /dev/null
+++ b/matplotlib/stacked_bar_graph.py
@@ -0,0 +1,21 @@
+import numpy as np
+import matplotlib.pyplot as plt
+
+
+N = 5
+menMeans = (20, 35, 30, 35, 27)
+womenMeans = (25, 32, 34, 20, 25)
+menStd = (2, 3, 4, 1, 2)
+womenStd = (3, 5, 2, 3, 3)
+ind = np.arange(N)              # the x locations for the groups
+width = 0.35                    # the width of the bars: can also be len(x) sequence
+
+p1 = plt.bar(ind, menMeans, width, yerr=menStd)
+p2 = plt.bar(ind, womenMeans, width,bottom=menMeans, yerr=womenStd)
+
+plt.ylabel('Scores')
+plt.title('Scores by group and gender')
+plt.xticks(ind, ('G1', 'G2', 'G3', 'G4', 'G5'))
+plt.yticks(np.arange(0, 81, 10))
+plt.legend((p1[0], p2[0]), ('Men', 'Women'))
+plt.show()
\ No newline at end of file
diff --git a/matplotlib/tempCodeRunnerFile.py b/matplotlib/tempCodeRunnerFile.py
index 99c9799..bd57c8a 100644
--- a/matplotlib/tempCodeRunnerFile.py
+++ b/matplotlib/tempCodeRunnerFile.py
@@ -1 +1,4 @@
-,autopct='%1.2f'
\ No newline at end of file
+import matplotlib.pyplot as plt
+x=[12, 15, 23, 33, 35, 38, 39, 50, 52, 56, 43, 18]
+plt.hist(x, bins=[10, 20, 30, 40, 50, 60],rwidth=0.80)
+plt.show()
\ No newline at end of file
diff --git a/pandas/dataFrames/tempCodeRunnerFile.py b/pandas/dataFrames/tempCodeRunnerFile.py
new file mode 100644
index 0000000..4671fa3
--- /dev/null
+++ b/pandas/dataFrames/tempCodeRunnerFile.py
@@ -0,0 +1 @@
+marks = pd.Series({'rakesh':56,'anuj':89,'Bhumi':90,'Jagdev':80})
\ No newline at end of file
diff --git a/pandas/seletion_slicing.py b/pandas/seletion_slicing.py
new file mode 100644
index 0000000..242316a
--- /dev/null
+++ b/pandas/seletion_slicing.py
@@ -0,0 +1,8 @@
+import pandas as pd
+import numpy as np
+
+s = pd.Series(np.arange(2,20,2))
+print(s[2])    # show value at index 2
+print(s[1:])   # display all element from 1 index onward
+print(s[:4])   # display values present at index 0,1,2,3
+print(s[1::2]) # display value present at index 1,3,5,7
\ No newline at end of file
diff --git a/pandas/series1.py b/pandas/series1.py
new file mode 100644
index 0000000..a0a0b17
--- /dev/null
+++ b/pandas/series1.py
@@ -0,0 +1,6 @@
+import pandas as pd
+import numpy as np
+
+#blank series
+s = pd.Series()
+print(s)
diff --git a/pandas/series10.py b/pandas/series10.py
new file mode 100644
index 0000000..95a931b
--- /dev/null
+++ b/pandas/series10.py
@@ -0,0 +1,6 @@
+
+# series with string and index also in string
+import pandas as pd
+s = pd.Series('Welcome to DAV Chander Nagar', index=[
+              'rakesh', 'arushi', 'mannat', 'vinay', 'pratham'])
+print(s)
diff --git a/pandas/series11.py b/pandas/series11.py
new file mode 100644
index 0000000..4d3f0d9
--- /dev/null
+++ b/pandas/series11.py
@@ -0,0 +1,4 @@
+# series with range and for loop
+import pandas as pd
+s = pd.Series(range(5), index=[x for x in 'abcde'])
+print(s)
diff --git a/pandas/series12.py b/pandas/series12.py
new file mode 100644
index 0000000..1764a64
--- /dev/null
+++ b/pandas/series12.py
@@ -0,0 +1,6 @@
+# series with two different lists
+import pandas as pd
+names = ['rakesh', 'vishank', 'nikunj', 'unnati', 'vipul']
+city = ['GZB', 'Delhi', 'Meerut', 'Pune', 'Panji']
+s = pd.Series(names, index=city)
+print(s)
\ No newline at end of file
diff --git a/pandas/series13.py b/pandas/series13.py
new file mode 100644
index 0000000..92de67a
--- /dev/null
+++ b/pandas/series13.py
@@ -0,0 +1,6 @@
+
+#series with Nan values of numpy
+import pandas as pd
+import numpy as np
+s = pd.Series([10, 20, 30, np.NaN, -34.5, 6])
+print(s)
diff --git a/pandas/series14.py b/pandas/series14.py
new file mode 100644
index 0000000..e23beb9
--- /dev/null
+++ b/pandas/series14.py
@@ -0,0 +1,6 @@
+#series from a python Dictionary
+import pandas as pd
+dict1 = {'name': 'rakesh', 'roll': 20, 'city': 'Gzb',
+         'age': 40, 'profession': 'Teaching'}
+s = pd.Series(dict1)
+print(s)
diff --git a/pandas/series15.py b/pandas/series15.py
new file mode 100644
index 0000000..10a82e1
--- /dev/null
+++ b/pandas/series15.py
@@ -0,0 +1,6 @@
+# series using a mathematical expression
+import pandas as pd
+import numpy as np
+data = np.arange(10, 15)
+s = pd.Series(data**2, index=data)
+print(s)
diff --git a/pandas/series2.py b/pandas/series2.py
new file mode 100644
index 0000000..1139ddc
--- /dev/null
+++ b/pandas/series2.py
@@ -0,0 +1,6 @@
+import pandas as pd
+import numpy as np
+
+#series with numbers
+s = pd.Series([10, 20, 30, 40, 50])
+print(s)
diff --git a/pandas/series3.py b/pandas/series3.py
new file mode 100644
index 0000000..e9c75d5
--- /dev/null
+++ b/pandas/series3.py
@@ -0,0 +1,3 @@
+import pandas as pd
+s = pd.Series([10, 20, 30, 40, 50], index=[1, 2, 3, 4, 5])
+print(s)
diff --git a/pandas/series4.py b/pandas/series4.py
new file mode 100644
index 0000000..283b5d8
--- /dev/null
+++ b/pandas/series4.py
@@ -0,0 +1,4 @@
+#series with numbers and char index
+import pandas as pd
+s = pd.Series([10, 20, 30, 40, 50], index=['a', 'b', 'c', 'd', 'e'])
+print(s)
diff --git a/pandas/series5.py b/pandas/series5.py
new file mode 100644
index 0000000..4bc99cb
--- /dev/null
+++ b/pandas/series5.py
@@ -0,0 +1,4 @@
+#series with constant values
+import pandas as pd
+s = pd.Series(55, index=[1, 2, 3, 4, 5, 6])
+print(s)
diff --git a/pandas/series6.py b/pandas/series6.py
new file mode 100644
index 0000000..c9bd67b
--- /dev/null
+++ b/pandas/series6.py
@@ -0,0 +1,4 @@
+#series with constant and python function
+import pandas as pd
+s = pd.Series(34, index=range(100))
+print(s)
diff --git a/pandas/series7.py b/pandas/series7.py
new file mode 100644
index 0000000..f54e390
--- /dev/null
+++ b/pandas/series7.py
@@ -0,0 +1,4 @@
+# series with python function
+import pandas as pd
+s = pd.Series(range(2, 89))
+print(s)
diff --git a/pandas/series8.py b/pandas/series8.py
new file mode 100644
index 0000000..8d254ee
--- /dev/null
+++ b/pandas/series8.py
@@ -0,0 +1,4 @@
+# series with float values
+import pandas as pd
+s=pd.Series([10, 20, 30, 40.5, 50])
+print(s)
diff --git a/pandas/series9.py b/pandas/series9.py
new file mode 100644
index 0000000..886ab28
--- /dev/null
+++ b/pandas/series9.py
@@ -0,0 +1,4 @@
+# series with string type values
+import pandas as pd
+s = pd.Series('Welcome to DAV Chander Nagar', index=[1, 2, 3, 4, 5, 6])
+print(s)
diff --git a/pandas/series_methods.py b/pandas/series_methods.py
new file mode 100644
index 0000000..7e95ee7
--- /dev/null
+++ b/pandas/series_methods.py
@@ -0,0 +1,17 @@
+import pandas as pd
+marks=[]
+for i in range(5):
+    n = int(input("Marks :"))
+    marks.append(n)
+
+s = pd.Series(marks)
+#print(s)
+print(s.sort_values(ascending=True)) # False for Descending
+lar = s.max()
+low = s.min()
+summ = s.sum()
+noe = len(s)
+print('Maximum values :', lar)
+print('Minimum values :', low)
+print('Sum of values :', summ)
+print('Average value ', summ/noe)
\ No newline at end of file
diff --git a/pandas/series_object.py b/pandas/series_object.py
index 61ff187..2d61d00 100644
--- a/pandas/series_object.py
+++ b/pandas/series_object.py
@@ -9,8 +9,6 @@
 #   series.hasnans      - return true if there are any Nan value
 #   series.empty        - return true if series object is empty
 
-
-
 import pandas as pd
 
 s= pd.Series(range(3,30,3))
diff --git a/pandas/series_slicing2.py b/pandas/series_slicing2.py
new file mode 100644
index 0000000..3c30bee
--- /dev/null
+++ b/pandas/series_slicing2.py
@@ -0,0 +1,8 @@
+import pandas as pd
+import numpy as np
+
+s = pd.Series(np.arange(2, 20, 2),index=[x for x in "abcdefghi"])
+print(s[2])    # show value at index 2
+print(s[1:])   # display all element from 1 index onward
+print(s[:4])   # display values present at index 0,1,2,3
+print(s[1::2])  # display value present at index 1,3,5,7
diff --git a/pandas/tempCodeRunnerFile.py b/pandas/tempCodeRunnerFile.py
new file mode 100644
index 0000000..e8a486f
--- /dev/null
+++ b/pandas/tempCodeRunnerFile.py
@@ -0,0 +1,13 @@
+# retirve values from pandas series using head() and tail() function
+
+import pandas as pd
+s= pd.Series(range(1,1000,5))
+#print top 5 entries of the series
+print(s.head())
+#print top 2 entries of the series
+print(s.head(2))
+
+#print last 5 entries of the series
+print(s.tail())
+# print last 2 entries of the series
+print(s.tail(2))
\ No newline at end of file
diff --git a/pandas/vector_operation_series.py b/pandas/vector_operation_series.py
index 8089557..27485e3 100644
--- a/pandas/vector_operation_series.py
+++ b/pandas/vector_operation_series.py
@@ -1,6 +1,6 @@
 import pandas as pd
-s = pd.Series(range(2,40))
-print("Print True if Values Greater than 12 else faslse")
+s = pd.Series(range(2,20))
+print("Print True if Values Greater than 12 else false")
 print(s>12)
 
 print("Print values greater than 12")
diff --git a/stock.csv b/stock.csv
new file mode 100644
index 0000000..2db755a
--- /dev/null
+++ b/stock.csv
@@ -0,0 +1,5 @@
+ID,name,Price,Qty
+102,LG Monitor,6500,20
+103,KeyBoard,1350,156
+105,Hp Mouse,650,120
+106,Speaker,1670,136
diff --git a/student.csv b/student.csv
new file mode 100644
index 0000000..277c95e
--- /dev/null
+++ b/student.csv
@@ -0,0 +1,5 @@
+rollno,name,stream,fees
+12,surendra,Humanities,2356
+13,Ashok Goyal,Humanities,2356
+15,Nipun,Humanities,2356
+22,Ayush Negi,Science,2356
\ No newline at end of file
diff --git a/student.dat b/student.dat
index ce6b3f1..e69de29 100644
Binary files a/student.dat and b/student.dat differ
diff --git a/tempCodeRunnerFile.py b/tempCodeRunnerFile.py
index 92b2adf..d27822c 100644
--- a/tempCodeRunnerFile.py
+++ b/tempCodeRunnerFile.py
@@ -1 +1,2 @@
-target_list
\ No newline at end of file
+file = open("student.dat","w")
+writer = csv.DictWriter(file,fieldnames ="", lineterminator ='\n')
\ No newline at end of file
diff --git a/update_readerWriter.py b/update_readerWriter.py
new file mode 100644
index 0000000..aa3ac5c
--- /dev/null
+++ b/update_readerWriter.py
@@ -0,0 +1,28 @@
+# program to update a record in csv file
+import csv
+name = input('Name to Update :')
+records = []
+found = 0
+file = open("student.csv", "r")
+reader = csv.reader(file)
+for record in reader:
+    if(record[1] == name):
+        record[1] = input('New Name:')
+        records.append(record)
+        found = 1
+    else:
+        records.append(record)
+file.close()
+
+# Remove the old file and create a new csv file
+headers = ['rollno', 'name', 'stream', 'fees']
+file = open("student.csv", "w")
+writer = csv.writer(file, lineterminator='\n')
+writer.writerow(headers)
+writer.writerows(records)
+file.close()
+
+if(found == 0):
+    print(name, " does not exists")
+else:
+    print(name, " updated successfully")