AttributeError：…对象没有属性'update'

Question

我有以下代码从URL列表下载HTML内容。 每当我运行它时，我都会收到一条错误消息，指出“追踪（最近一次通话过去）：

 File "*******", line 16, in <module>
    **hashMessage = computeMD5(url)**

  File "*******", line 13, in computeMD5
    **m.update(message)**

*AttributeError: 'builtin_function_or_method' object has no attribute 'update'*

这是代码：

    import hashlib
    from hashlib import md5
    import os

    fh = open("****.txt", 'r')

    for line in fh:
         url = line
         url = url.replace('\n', '')

         def computeMD5(message):
            m = hashlib.md5
            m.update(message)
            return m.hexdigest()

        hashMessage = computeMD5(url)
        print hashMessage

        os.system(" wget -O /desktop/Html" + hashMessage + ".txt " + url)

我怎样才能解决这个问题？

Answer 1

您试图在函数而不是对象上调用方法。 而是调用：

import hashlib
from hashlib import md5
import os

fh = open("****.txt", 'r')

for line in fh:
     url = line
     url = url.replace('\n', '')

     def computeMD5(message):
        m = hashlib.md5()  # instead of m = hashlib.md5
        m.update(message)
        return m.hexdigest()

    hashMessage = computeMD5(url)
    print hashMessage

    os.system(" wget -O /desktop/Html" + hashMessage + ".txt " + url)