str.replace adding back slash

I have this interactive session:

>>> str = '192.168.1.1'
>>> str = str.replace('.','\.')
>>> str
'192\\.168\\.1\\.1'

I want the out put to be: 192\.168\.1\.1 instead of 192\\.168开发者_如何学C\\.1\\.1

How can I achieve this? Why is it behaving this way?

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Use print str instead of str:

>> str = '192.168.1.1'
>>> str = str.replace('.','\.')
>>> str
'192\\.168\\.1\\.1'
>>> print str
192\.168\.1\.1

Your string is the one you expect it to be, but when you just dump the object, python is showing it to you in a form you could use to assign to another string - that means escaping the \ characters.

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The string is exactly what it should be. The extra slashes are only in the display, not in the actual string.

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\ is an escape character, so \ is required to add \ to the string by hiding its escape character nature.

If you use "print" before your string name, you'll see how it appears rather than what it actually contains.