snippets.md

Python

some basic commands

exit REPL cmd D

basics

'this is a string'
"this is a string"
'this is not"
"first" "second"
>>> "firstsecond"

"""this is
   a multiline string
>>> this is \na multiline string

a = c
print(a)

1 + 7
>>>8

path = r'C:\path'

type(a)
>>> <type 'string'>

\n is a new line, ' escaping a quote r'' is a raw string

while

C = 5
while C != 0:
    print(c)
    c -=1

^c terminates loops

if

if "eggs":
 print("true")
elif "bacon":
 print("smoked")
else:
 print("false")

elif is python for else if, obviously

lists

[1, 9, 8]

a = ["apple", "pear", "lemon"]
a(3);

a.append("melon")
list("characters")

dict

d = {'alice':'878-8728-922'}

maps keys to values (assoc array) might not be stored in the same order, entered.

for loop

cities = ["London","New York","Pittsburgh","Barcelona"]
for city in cities:
 print(city)

setting up default python on mac os

Below command shows how it should be done:

ln -s -f /usr/local/bin/python3.7 /usr/local/bin/python

Close the current terminal session or keep it that way and instead open a new terminal window (not tab). Run this:

python --version