In Python, is there an option to create a custom string class, that could be created by typing something like:
a = b"some string"
a.someCustomMethod()
Just like python has its u"" and r"" strings?
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thefourtheye
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Yotam Vaknin
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What are you hoping to accomplish this way? – Karl Knechtel Jan 23 '14 at 09:02
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1possible duplicate of [Add custom method to string object](http://stackoverflow.com/questions/4699179/add-custom-method-to-string-object) – ndpu Jan 23 '14 at 09:06
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I'm trying to make using my type of string VERY easy for the users of my library. – Yotam Vaknin Jan 23 '14 at 10:08
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First I thought this was about [`typing.NewType`](https://docs.python.org/3/library/typing.html#newtype), but actually it seems to be about basic OOP in python. – Martin Thoma Jun 22 '20 at 20:31
1 Answers
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It's straightforward to write your own string class, but you can't get the construction syntax you want. The closest you can get is
a = MyString("some string")
where MyString is your custom class. I suppose you can alias b = MyString if you want.
Also, note that b"some string" is already the bytestring literal syntax. In Python 2, it just makes a regular string. In Python 3, it makes a bytes object, since regular strings are unicode in Python 3.
user2357112
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1Note that you can subclass `str` or `UserString` to create `MyString` and gain all the properties you'd expect from a normal string in addition to your new property. See http://docs.python.org/2.7/library/userdict.html?#module-UserString and http://stackoverflow.com/a/4699190/1970751 – Cilyan Jan 23 '14 at 09:43