如何使用Python流对象？
我有一个函数，它接受一个打开的文件对象 file 并向其中写入数据，如下所示：
def Write(self, file):
file.write("Data")
现在我想测试该函数，我认为使用某种流来做到这一点会很巧妙没有将数据写入文件。除了 StringIO 类。然而，在Python2.7中，此类在write函数中需要一个unicode字符串。 (file.write(u"Data")) 因此我无法使用 StringIO 类测试我的 Write 函数。
在我的解决方法中，我创建了一个小虚拟类
class MyStream(object):
S = property(lambda self: self._S)
def __init__(self):
self._S = ""
def write(self, s):
self._S += s
，现在可以使用它成功测试我的 Write 函数。
我的问题：
是否有一个本机 python 类可以执行相同的操作？
提前感谢您的任何建议
问候沃尔坦
I have a function that takes an opened file object file and writes data to it like so:
def Write(self, file):
file.write("Data")
Now I would like to test that function and I thought it would be neat to do that with some kind of stream that is not writing data to a file. I could not find a Python2.7 class that does the job except the StringIO class. However, in Python2.7 this class expects a unicode string in the write function. (file.write(u"Data")) So I cannot test my Write function with the StringIO class.
In my workaround I created a little dummy class
class MyStream(object):
S = property(lambda self: self._S)
def __init__(self):
self._S = ""
def write(self, s):
self._S += s
with which I can now successfully test my Write function.
My question:
Is there a native python class that does the same trick?
Thx in advance for any suggestions
Regards Woltan
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正如 io 的文档所述：
即，如果您使用向后移植的 Python 3 IO 库，则必须使用 unicode。但是，原始的 StringIO 类（考虑字节（Python 2 字符串）文本并接受它们）仍然存在于 Python 2.7 中，只是不在向后移植的 io 中。相反，它有自己的模块，也称为 StringIO。
As the documentation of
iostates:I.e. if you use the backported Python 3 IO library, you have to use unicode. However, the original
StringIOclass - which considers bytes (Python 2 strings) text and accepts them - still exists in Python 2.7, it's just not in the backportedio. Instead, it has its own module, also calledStringIO.