name ' ' is not defined error

[nonzzo]

it won't print my str please help it has worked before but just now it won't work

[ichabod801]

Copy and paste your code using python tags, and put the full text of the error message in output tags.

[nonzzo]

import math

while True:  
    try:
        tal = int(input("tal?: "))
    except ValueError:
        print("kun tal")
    n = tal
    for p in range(2,n):
        moudu = n%p
        prime = "det er et primtal"
        if moudu == 0:
            prime = "det er ikke et primtal"
            break
    ianden = tal*tal
    print (prime)
    print ("² = ", ianden)
    print ("kvadratrod =", math.sqrt(tal))
    
    input('Press enter to continue: ')

Output:
Exception has occurred: NameError
name 'prime' is not defined
  File "C:\Users\nonoe\OneDrive\Skrivebord\info om tal 0.1.py", line 20, in <module>
    print (prime)

[ichabod801]

The variable prime only gets defined if a value greater than 2 is entered. If you enter 1 on the first try, the loop on line 9 never executes, and prime never gets defined. Note that if you enter 1 on the second try, it uses the value of prime from the previous try. You need to set a value to prime before that loop.

[nonzzo]

thank you very much.
this really helped my day :)