Question

I am trying to call a function defined in a class from main..how can I do that?

class file_process:
    def findb(self, id):
    ....  

def main():
  id = sys.argv[2]
 file_process.findb(id)//how to call findb function from main,this is giving an error

Answer 1

Since finddb is a method, you need to call it on an instance of file_process:

file_process().finddb(id)

I strongly urge you to study up on Python and classes, I can recommend the Python tutorial, before you continue.