Python: Some Keywords

KEYWORD	DESCRIPTION	EXAMPLE
and	Logical and.	True and False == False
as	Part of the with-as statement.	with X as Y: pass
assert	Assert (ensure) that something is true.	assert False, "Error!"
break	Stop this loop right now.	while True: break
class	Define a class.	class Person(object)
continue	Don't process more of the loop, do it again.	while True: continue
def	Define a function.	def X(): pass
del	Delete from dictionary.	del X[Y]
elif	Else if condition.	if: X; elif: Y; else: J
else	Else condition.	if: X; elif: Y; else: J
except	If an exception happens, do this.	except ValueError, e: print e
exec	Run a string as Python.	exec 'print "hello"'
finally	Exceptions or not, finally do this no matter what.	finally: pass
for	Loop over a collection of things.	for X in Y: pass
from	Importing specific parts of a module.	import X from Y
global	Declare that you want a global variable.	global X
if	If condition.	if: X; elif: Y; else: J
import	Import a module into this one to use.	import os
in	Part of for-loops. Also a test of X in Y.	for X in Y: pass also 1 in [1] == True
is	Like == to test equality.	1 is 1 == True
lambda	Create a short anonymous function.	s = lambda y: y ** y; s(3)
not	Logical not.	not True == False
or	Logical or.	True or False == True
pass	This block is empty.	def empty(): pass
print	Print this string.	print 'this string'
raise	Raise an exception when things go wrong.	raise ValueError("No")
return	Exit the function with a return value.	def X(): return Y
try	Try this block, and if exception, go to except.	try: pass
while	While loop.	while X: pass
with	With an expression as a variable do.	with X as Y: pass
yield	Pause here and return to caller.	def X(): yield Y; X().next()