from multiprocess import Pool


def fun(x):
    return fun1(x)

def fun1(x):
    return x**2

pool = Pool(4)

pool.map(fun,[1,2,3,4])


output:

NameError: name 'fun1' is not defined

from multiprocess import Pool
def fun(x):
    print fun1(x)

def fun1(x):
    return x**2

if __name__ == '__main__':
    pool = Pool(4)
    pool.map(fun,[1,2,3,4])