if 语句

if condition:
    ...
elif condition:
    ...
else:
    ...

while 语句

while condition:
    ...
else:
    ...

for 循环

for i in range ( 1 , 5 ):
    print (i)
else :
    print ( 'The for loop is over' )

break 语句

终止循环

continue 语句

跳过本次循环