how to reading binary data...

[Sandeep Avinash Gohad]

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Hello

I opened any particular file with the 'rb' mode that is read binary mode. so python will treat the data as a raw data. now i want to read first 4 bytes only then i will convert the first 4 bytes into long datatype and then again read 4 bytes and will do the same.
But how to set & move the pointer using loop?
also how to convert into long?

Regards
Sandeep