Python 3 - TypeError:需要一个类似字节的对象，而不是“str" [英] Python 3 - TypeError: a bytes-like object is required, not 'str'

问题描述

我正在学习 Udacity 的课程，但在尝试确定此站点的结果返回 true 还是 false 时遇到了一些问题.我用下面的代码得到了 TypeError.

I'm working on a lesson from Udacity and am having some issue trying to find out if the result from this site returns true or false. I get the TypeError with the code below.

   from urllib.request import urlopen
    #check text for curse words  
    def check_profanity():
        f = urlopen("http://www.wdylike.appspot.com/?q=shit")
        output = f.read()
        f.close()
        print(output)
        if "b'true'" in output:
            print("There is a profane word in the document")

    check_profanity()

输出打印 b'true' 并且我不确定那个 'b' 是从哪里来的.

The output prints b'true' and I'm not really sure where that 'b' is coming from.

推荐答案

在 python 3 中，字符串默认为 unicode.b'true' 中的 b 表示该字符串是字节字符串而不是 unicode.如果你不想要，你可以这样做:

In python 3 strings are by default unicode. The b in b'true' means that the string is a byte string and not unicode. If you don't want that you can do:

 from urllib.request import urlopen
 #check text for curse words  
 def check_profanity():
    with urlopen("http://www.wdylike.appspot.com/?q=shit") as f:
        output = f.read().decode('utf-8')
        if output:
            if "true" in output:
                print("There is a profane word in the document")

check_profanity()

使用 with 将自动关闭 urlopen 连接.

Using with will close the urlopen connection automatically.

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