文档测试doctest

def compare(x,y):
"""
>>> compare(5,4)
1
>>> compare (7,7)
0
>>> compare (2,3)
-1
"""
if x>y:
	return 1
elif x==y:
	return 0
else :
	return -1
if __name__=='__main__':
	import doctest
	doctest.testmod()
这样运行python compare.py -v就会输出
Trying:
compare(5,4)
Expecting:
1
ok
Trying:
compare (7,7)
Expecting:
0
ok
Trying:
compare(2,3)
Expecting:
-1
ok
1 items had no tests:
__main__
1 items passed all tests:
3 tests in __main__.compare
3 tests in 2 items.
3 passed and 0 failed.
Test passed.


总结：运行的是注释里面的内容（ """  """），如果错误就会报错

只会在命令行模式下面执行