python：TypeError：无法将str写入文本流
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python: TypeError: can't write str to text stream
提问by Jason S
I must be doing something obviously wrong here. But what is it, and how do I fix?
我一定在这里做错了什么。但它是什么，我该如何解决？
Python 2.6.5 (r265:79096, Mar 19 2010, 21:48:26) [MSC v.1500 32 bit (Intel)] on
win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import io
>>> f1 = io.open('test.txt','w')
>>> f1.write('bingo')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "c:\appl\python.6.5\lib\io.py", line 1500, in write
s.__class__.__name__)
TypeError: can't write str to text stream
edit: In my real application, I won't have a constant string, I'll have a regular string... if unicode is the issue, how do I convert to what io.open requires?
编辑：在我的实际应用程序中，我不会有一个常量字符串，我会有一个常规字符串......如果问题是 unicode，我如何转换为 io.open 需要的内容？
采纳答案by Edward Loper
The iomodule is a fairly new python module (introduced in Python 2.6) that makes working with unicode files easier. Its documentation is at: http://docs.python.org/library/io.html
该io模块是一个相当新的 Python 模块（在 Python 2.6 中引入），可以更轻松地处理 unicode 文件。其文档位于：http: //docs.python.org/library/io.html
If you just want to be writing bytes (Python 2's "str" type) as opposed to text (Python 2's "unicode" type), then I would recommend you either skip the iomodule, and just use the builtin "open" function, which gives a file object that deals with bytes:
如果您只想写入字节（Python 2 的“str”类型）而不是文本（Python 2 的“unicode”类型），那么我建议您跳过该io模块，只使用内置的“open”函数，它给出一个处理字节的文件对象：
>>> f1 = open('test.txt','w')
Or, use 'b' in the mode string to open the file in binary mode:
或者，在模式字符串中使用 'b' 以二进制模式打开文件：
>>> f1 = io.open('test.txt','wb')
Read the docs for the io module for more details: http://docs.python.org/library/io.html
阅读 io 模块的文档以获取更多详细信息：http: //docs.python.org/library/io.html
回答by mbm
f = open("test.txt", "w")
f.write('bingo')
f.close()
equivalently,
等效地，
with open("test.txt", "w") as f:
f.write('bingo')
and the termination of the block closes the file for you.
并且块的终止会为您关闭文件。
回答by mipadi
Have you tried writing a Unicode string, instead of just a str? I.e.,
您是否尝试过编写 Unicode 字符串，而不仅仅是str? IE，
fq.write(u"bingo")
I'm on Mac OS X, but when I tried to write a str, I got the error
我在 Mac OS X 上，但是当我尝试编写一个 时str，出现错误
TypeError: must be unicode, not str
类型错误：必须是 unicode，而不是 str
Writing a Unicode string worked, though.
不过，编写一个 Unicode 字符串是可行的。
回答by Lennart Regebro
The io module differs from the old open in that it will make a big difference between binary and text files. If you open a file in text mode, reading will return Unicode text objects (called unicodein Python 2 and strin Python 3) and writing requires that you give it unicode objects as well.
io 模块与旧的 open 不同，它将在二进制文件和文本文件之间产生很大的不同。如果您以文本模式打开文件，读取将返回 Unicode 文本对象（unicode在 Python 2 和strPython 3 中调用），而写入也要求您为其提供 unicode 对象。
If you open in binary mode, you will get 8-bit sequential data back, and that's what you need to write. In Python 2 you use strfor this, in Python 3 bytes.
如果以二进制模式打开，将返回 8 位顺序数据，这就是您需要编写的内容。在 Python 2 中，您str用于此目的，在 Python 3 中bytes。
You are using Python 2, and trying to write str to a file opened in text mode. That won't work. Use Unicode.
您正在使用 Python 2，并尝试将 str 写入以文本模式打开的文件。那行不通。使用 Unicode。
