假设我有以下代码：
def foo(s):
"""A dummy function foo. For example:
>>> a = '''This is a test string line 1
This is a test string line 2
This is a test string line 3'''
>>> foo(a)
This is a test string line 1
This is a test string line 2
This is a test string line 3
>>>
"""
print s
if __name__ == '__main__':
import doctest
doctest.testmod()
我们将其保存为 foo.py。当我跑步时：
C:\Python27>python.exe foo.py
**********************************************************************
File "foo.py", line 5, in __main__.foo
Failed example:
a = '''This is a test string line 1
Exception raised:
Traceback (most recent call last):
File "C:\Python27\lib\doctest.py", line 1254, in __run
compileflags, 1) in test.globs
File "<doctest __main__.foo[0]>", line 1
a = '''This is a test string line 1
^
SyntaxError: EOF while scanning triple-quoted string literal
**********************************************************************
File "foo.py", line 8, in __main__.foo
Failed example:
foo(a)
Exception raised:
Traceback (most recent call last):
File "C:\Python27\lib\doctest.py", line 1254, in __run
compileflags, 1) in test.globs
File "<doctest __main__.foo[1]>", line 1, in <module>
foo(a)
NameError: name 'a' is not defined
**********************************************************************
1 items had failures:
2 of 2 in __main__.foo
***Test Failed*** 2 failures.
已尝试缩进文档字符串（>>> a = '''...'''。已检查所有缩进 - 每个缩进 4 个空格）并将单引号更改为双引号（>>> a = """.. ..""")，错误是不同的，文档测试不会成功。目前唯一可行的方法是将所有行连接到一个极长的字符串并用 '\r\n' 分隔。
我错过了什么吗？
我认为你需要在那里放一些点
>>> a = """This is a test string line 1
... This is a test string line 2
... This is a test string line 3"""
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