Learn Python the Hard Way, Exercise 22: What Do You Know So Far?

print	outputs results of expressions
python	run script using python
#	comment out part of a script
+	addition, or concatenate
–	subtraction
/	division
*	multiplication
%	modulo operator
>	greater than
<	less than
>=	greater than or equal to
<=	less than or equal to
=	equals, names things
%d	decimal
%r	string
%s	string
/n	newline
/t	tab
\	escape
\\	escape
“””	string, as many lines of text as you want
”’	string, as many lines of text as you want
raw_input	read a string from input
pydoc	python documentation
open	open a file
file	open or create a file
os	operating system
sys	built-in module
import	find/initialize a module
argv	The list of command line arguments passed to a Python script.
read	read a file’s contents
close	close a file
readline	Read one entire line from the file.
truncate	Empties the file
write	writes stuff to file
exists	Return True if path refers to an existing path. Returns False for broken symbolic links.
def	start a function
*args	pass an argument list, like argvs for functions
seek	set a file’s position
+=	delimiter, variable equals itself plus one
return	You can return anything that you can put to the right of an =

Megan Taylor