call python function

[python1980]

I created a .py file, the code is a function that simply calculates v*p

def amount(v,p):
    amt=v*p
    return amt

now i saved it as calc_val.py , i am using windows 7, so from dos prompt i go to the path where i saved the file

and did this

python calc_val.py, i got back the dos prompt, question is, is this function "saved" somewhere ? like how functions are saved in oracle ? and if so how can i see it ?

and, from dos prompt, can i pass in the arguments to a python function ? if not, then does that mean the only way i can create a python function with arguments is to get into python using ide and can't use a .py file ?

how can i call above function from dos prompt ,

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I got it, i learnt how to import the .py file, and then call the function by using the file_name.function_name(arguments)

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however, the question still is, is this function saved somewhere ? if not, i have to import the file name everytime i use it ?