define a main()

[buran]

something like this

def foo():
    print('this is output from function foo')

def bar():
    print('this is output from function bar')

def main(): # this function can be names as you want
    foo() # call function foo
    bar() # call function bar

if __name__ == '__main__':
    main()

def foo():
    print('this is output from function foo')

def bar():
    print('this is output from function bar')

if __name__ == '__main__':
    foo()
    bar()

note the line if __name__ == '__main__':
it allows to import your module in other modules, but if executed as a python file what is in the body will be executed, e.g. call to main or call of foo and bar in the second example.