List comprehension, string operation; danger of NoneType assignment.

months.py

# Stephanie M. Davis. 8-1-2018 in Washington D.C. for NASA showcase event
# Just practicing list comprehensions. In the process, I FINALLY learned the futuility of assigning a NoneType method to a variable
# Build a list of the 12 months and build a new list of those months beginning with the letter 'A'

months = ['January','February','March','April','May','June','July','August','September','October','November','December']
a_months = [month for month in months if month.starswith('A')]

# just for laughs apply reverse method to a_months and assign to variable none_type and see what happens

none_type = a_months.reverse()
none_type