文档测试嵌套文档字符串

Question

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() 

而且让我们将它保存为foo.py.当我运行：

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. 

试过缩进的文档字符串（>>> A =“”“...‘’”都检查过了缩进 - 4个空格每个缩进。），改变了单引号双引号（>>> a =“”“....”“”），错误是不同的，doctest不会成功。目前唯一的工作是将所有行连接到极长的字符串，并用'\ r \ n'分隔。

我想念什么？

Answer 1

我认为你需要把一些点有

>>> a = """This is a test string line 1 
... This is a test string line 2 
... This is a test string line 3"""