python如何写for循环

for <variable> in <sequence>:

    <statements>

else:

    <statements>

>>>languages = ["C", "C++", "Perl", "Python"]

>>> for x in languages:

...     print (x)

...

C

C++

Perl

Python

>>>

sites = ["Baidu", "Google","Runoob","Taobao"]

for site in sites:

    if site == "Runoob":

        print("菜鸟教程!")

        break

    print("循环数据 " + site)

else:

    print("没有循环数据!")

print("完成循环!")

循环数据 Baidu

循环数据 Google

菜鸟教程!

完成循环!