Add line breaks to increase code readability

[sen1]

Capstone/musclehub.py

Lines 125 to 135 in 808f4ed

	df = sql_query(''' SELECT
	visits.first_name, visits.last_name, visits.gender, visits.email, visits.visit_date,
	fitness_tests.fitness_test_date, applications.application_date, purchases.purchase_date
	FROM visits
	LEFT JOIN fitness_tests
	ON visits.first_name = fitness_tests.first_name AND visits.last_name = fitness_tests.last_name AND visits.email = fitness_tests.email
	LEFT JOIN applications
	ON visits.first_name = applications.first_name AND visits.last_name = applications.last_name AND visits.email = applications.email
	LEFT JOIN purchases
	ON visits.first_name = purchases.first_name AND visits.last_name = purchases.last_name AND visits.email = purchases.email
	WHERE visits.visit_date >= '7-1-17'

Great job here. However, I would add line breaks to increase code readability. We did not follow code styling very closely in this course. However, it is very important. I would do:

df = sql_query('''
SELECT visits.first_name,
       visits.last_name,
       visits.visit_date,
       fitness_tests.fitness_test_date,
       applications.application_date,
       purchases.purchase_date
FROM visits
LEFT JOIN fitness_tests
    ON fitness_tests.first_name = visits.first_name
    AND fitness_tests.last_name = visits.last_name
    AND fitness_tests.email = visits.email
LEFT JOIN applications
    ON applications.first_name = visits.first_name
    AND applications.last_name = visits.last_name
    AND applications.email = visits.email
LEFT JOIN purchases
    ON purchases.first_name = visits.first_name
    AND purchases.last_name = visits.last_name
    AND purchases.email = visits.email
WHERE visits.visit_date >= '7-1-17'
''')

The PEP8 guide for the maximum length of a code line:
https://www.python.org/dev/peps/pep-0008/#maximum-line-length