a question about this python script! -

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if __name__=="__main__":     fname= raw_input("please enter file:")     mtrue=1     salaries=''     salarieslist={}     employeesdept=''     employeesdeptlist={}     try:         f1=open(fname)     except:         mtrue=0         print 'the %s not exist!'%fname     if mtrue==1:         ss=[]            x in f1.readlines():             if 'salaries' in x:                 salaries=x.strip()             elif 'employees' in x:                 employeesdept=x.strip()         f1.close()         if salaries , employeesdept:             salaries=salaries.split('-')[1].strip().split(' ')             d in salaries:                 s=d.strip().split(':')                 salarieslist[s[0]]=s[1]             employeesdept=employeesdept.split('-')[1].strip().split(' ')             d in employeesdept:                 s=d.strip().split(':')                 employeesdeptlist[s[0]]=s[1]             print "1) average salary in company: %s "%salarieslist['avg']                         print "2) maximum , minimum salaries in company: maximum:%s,minimum:%s "%(salarieslist['max'],salarieslist['min'])             print "3) how many employees there in each department :it:%s, development:%s, administration:%s"%(                 employeesdeptlist['it'],employeesdeptlist['development'],employeesdeptlist['administration'])           else:             print 'the %s data err!'%fname

when enter filename, didn't continue, why? if enter file named company.txt, show file not exist. why?

i can give hints can resolve problem better

create function , call in main e.g. 

if __name__=="__main__":     main()

don't put whole block under if mtrue==1: instead return function on error e.g.

def main():     fname= raw_input("please enter file:")     try:         f1=open(fname)     except:         print 'the %s not exist!'%fname         return      ... # main code here

never catch exceptions , instead catch specific exception e.g. ioerror

try:    f1 = open(fname): except ioerror,e:   print 'the %s not exist!'%fname

otherwise catching exception may catch syntax error or mis-spelled names etc

print exception getting, may not file not found, may don't have read permission or that

and problem that, file may not exist, try input full path


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