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#1
March 1st, 2009, 04:38 AM
 Sohvkhan
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Join Date: Feb 2009
Posts: 4
Time spent in forums: 26 m 19 sec
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How do you repeat or loop a python program?

Here is some code I have been working on for an assignment, basically it finds prime numbers in between two variables-in any case, I have been trouble figuring out a way to restart the program based on user input. Basically the user inputs y to restart and n to quit. Unfortunately, the code I have been coming up with so far is not working-thoughts?

Code:
```from math import *
def isPrime(n):
if n%2==0 and n!=2:return False

k = n**0.5 ;  m = ceil(k)
if k==m:return False

for i in xrange(3,int(m),2):
if n%i==0:return False

return True

if __name__=='__main__':
s = input('Enter Start: ')
e = input('Enter End:   ')
s|=1                               #if s%2==0:s+=1
list = [x for x in range(s,e,2) if isPrime(x)]
print "list of prime numbers", list
print "type y/n to go again or not"
cont_flag = True
while cont_flag:
isPrime(x)
dummy = raw_input('again (y/n): ').lower()
if dummy != 'y':
cont_flag = False```

#2
March 1st, 2009, 01:02 PM
 vodolan
Registered User

Join Date: Feb 2009
Posts: 18
Time spent in forums: 6 h 17 m 13 sec
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Try it this way:

Code:
```if __name__=='__main__':
cont_flag = True
while cont_flag:
s = input('Enter Start: ')
e = input('Enter End:   ')
s|=1                               #if s%2==0:s+=1
list = [x for x in range(s,e,2) if isPrime(x)]
print "list of prime numbers", list
print "type y/n to go again or not"
dummy = raw_input('again (y/n): ').lower()
if dummy != 'y':
cont_flag = False```

Quote:
 Originally Posted by Sohvkhan Here is some code I have been working on for an assignment, basically it finds prime numbers in between two variables-in any case, I have been trouble figuring out a way to restart the program based on user input. Basically the user inputs y to restart and n to quit. Unfortunately, the code I have been coming up with so far is not working-thoughts? Code: ```from math import * def isPrime(n): if n%2==0 and n!=2:return False k = n**0.5 ; m = ceil(k) if k==m:return False for i in xrange(3,int(m),2): if n%i==0:return False return True if __name__=='__main__': s = input('Enter Start: ') e = input('Enter End: ') s|=1 #if s%2==0:s+=1 list = [x for x in range(s,e,2) if isPrime(x)] print "list of prime numbers", list print "type y/n to go again or not" cont_flag = True while cont_flag: isPrime(x) dummy = raw_input('again (y/n): ').lower() if dummy != 'y': cont_flag = False```

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