How to Check if a String only Contains Alphanumeric Characters in Python

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In this lesson we're going to talk about that how to check if a string only contains alphanumeric characters by using isalnum() method in Python programming language.
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Hello

I would like to know how to search text file for example...
but i would like to know how to search for a string which is 5 character long and alphanumeric and all the letters must be in uppercase.
I have been trying to figure this out for so long, in Pascal, i feel useless.
I was told to try Python because it is more easier.
For me my basic knowledge at my age, and i still cant even do it.
Do you think you can help me please?

CollosalTrollge
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Can u find even mumber only from alphanumeric and print those number

mangalpardeshi