python3.7如何调试

__author__ = 'lxm'

#!/usr/bin/python

 import thread

 import time

 # Define a function for the thread

 def print_time( threadName, delay):   

    count = 0  

    while count <  5:      

    count += 1       

    print "%s: %s" % ( threadName, time.ctime(time.time()) )

def check_sum(threadName,valueA,valueB):   

    print "to calculate the sum of two number her"   

    result=sum(valueA,valueB)   

    print "the result is" ,result;

 def sum(valueA,valueB):  

    if valueA >0 and valueB>0:       

    return valueA+valueB

def readFile(threadName, filename):  

    file = open(filename)   

    for line in file.xreadlines():       

    print line

try:   

    thread.start_new_thread( print_time, ("Thread-1", 2, ) )  

    thread.start_new_thread( check_sum, ("Thread-2", 4,5, ) )   

    thread.start_new_thread( readFile, ("Thread-3","test.txt",))

except:   

    print "Error: unable to start thread"

 while 1:

 #   print "end"  

    pass