将hexdigest()的结果与字符串进行比较 [英] Compare result from hexdigest() to a string

问题描述

我有一个生成的MD5-hash，我想将其与字符串中的另一个MD5-hash进行比较.即使在打印时它们看起来一样，下面的语句也是假的.

I've got a generated MD5-hash, which I would like to compare to another MD5-hash from a string. The statement below is false, even though they look the same when you print them and should be true.

hashlib.md5("foo").hexdigest() == "acbd18db4cc2f85cedef654fccc4a4d8"

Google告诉我，我应该对hexdigest()中的结果进行编码，因为它不会返回字符串.但是，下面的代码似乎也不起作用.

Google told me that I should encode the result from hexdigest(), since it doesn't return a string. However, the code below doesn't seem to work either.

hashlib.md5("foo").hexdigest().encode("utf-8") == "foo".encode("utf-8")

推荐答案

Python 2.7，.hexdigest()确实返回了str

Python 2.7, .hexdigest() does return a str

>>> hashlib.md5("foo").hexdigest() == "acbd18db4cc2f85cedef654fccc4a4d8"
True
>>> type(hashlib.md5("foo").hexdigest())
<type 'str'>

Python 3.1

Python 3.1

.md5()不采用unicode("foo"是unicode)，因此需要将其编码为字节流.

.md5() doesn't take a unicode (which "foo" is), so that needs to be encoded to a byte stream.

>>> hashlib.md5("foo").hexdigest()
Traceback (most recent call last):
  File "<pyshell#1>", line 1, in <module>
    hashlib.md5("foo").hexdigest()
TypeError: Unicode-objects must be encoded before hashing

>>> hashlib.md5("foo".encode("utf8")).hexdigest()
'acbd18db4cc2f85cedef654fccc4a4d8'

>>> hashlib.md5("foo".encode("utf8")).hexdigest() == 'acbd18db4cc2f85cedef654fccc4a4d8'
True

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