Python素数循环

Question

When running this code, I keep having an error. I would like to know what is wrong. The code has to be able to read words and integers and repeat the prompt(Please enter an integer >= 2: ') until it is greater or equal to 2. Thanks in advance.

def prime_number():

    prime_num = input('Please enter an integer >= 2: ')

    while not(prime_num.isdigit() and int(prime_num)<1):

        prime_num = input('Please enter an integer >= 2: ')

    for i in range(2,int(prime_num)+1):
        for x in range(2,i):
            if i%x == 0:
                break
        else:
            print (i)

Answer 1

1. As mentioned by @rpattiso, you are not invoking the method and
2. You while condition is buggy

This should work:

def prime_number():
    prime_num = input('Please enter an integer >= 2: ')

    while not (prime_num.isdigit() and not int(prime_num)<1):
        prime_num = input('Please enter an integer >= 2: ')

    for i in range(2,int(prime_num)+1):
        for x in range(2,i):
            if i%x == 0:
                break
        else:
            print (i)
prime_number()

Answer 2

You need to enter the function. This is typically done in python with:

def prime_number():
    prime_num = input('Please enter an integer >= 2: ')    
    while not(prime_num.isdigit() and int(prime_num)<1):    
        prime_num = input('Please enter an integer >= 2: ')

    for i in range(2,int(prime_num)+1):
        for x in range(2,i):
            if i%x == 0:
                break
        else:
            print (i)


if __name__ == "__main__":
    prime_number()        

Just some advice in general. I would separate the input logic from the prime number calculation logic.