Creating a file with $SIZE

[k.i.n.g.]

I think I am not clear with my question, I am sorry. Here goes the
exact requirement.

We use dd command in Linux to create a file with of required size. In
similar way, on windows I would like to use python to take the size of
the file( 50MB, 1GB ) as input from user and create a uncompressed
file of the size given by the user.

ex: If user input is 50M, script should create 50Mb of blank or empty
file

Thank you