问Python编程帮助

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#!/usr/bin/env python
import math



def primeTest(isPrime):
print('    {0}=testnum'.format(testnum))
if testnum%2 == 0 and testnum != 2: #if divisible by 2 and not 2
    isPrime = False
    print('{0} a'.format(isPrime))
    print('a')  
else:
    numroot = round(math.sqrt(testnum))
    i = 2
    while i <= numroot:
        if testnum%i == 0:
            isPrime = False
        i+=1
    print('b')


global testnum
global isPrime
testnum=2
numPrimesSoFar=0
reqPrimes=int(input('How many primes would you like? \n'))
while numPrimesSoFar < reqPrimes:   
isPrime=True
primeTest(isPrime)
print(isPrime)
if isPrime:
    print('    {0}'.format(isPrime))
    print('    {0}'.format(testnum))
    numPrimesSoFar+=1
testnum+=1

    How many primes would you like? 
4
    2=testnum
b
True
    True
    2
    3=testnum
b
True
    True
    3
    4=testnum
False a
a
True
    True
    4
    5=testnum
b
True
    True
    5