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Appendix B. Python cheat sheet

Variable names

• Case-sensitive
• Can’t start with a number
• Can’t be a Python keyword
• OK—name, my_name, my_1st_name, name2
• Not OK—13_numbers, print

Strings

Description	Operator	Example	Output
Equality	==	'me' == 'ME' 'you' == 'you'	False True
Inequality	!=	'me' != 'ME' 'you' != 'you'	True False
Less than	<	'A' < 'a' 'b' < 'a'	True False
Less than or equal	<=	'Z' <= 'a' 'a' <= 'a'	True True
Greater than	>	'a' > 'B' 'a' > 'z'	True False
Greater than or equal	>=	'a' >= 'a' 'a' >= 'z'	True False
Contains	in	'Go' in 'Gopher' 'py' in 'PYTHON'	True False
Length	len	len('program') len('')	7 0

String indexing for s = "Python Cheat Sheet"

Indexing/slicing	Result
s[0]	'P' ...