Python求和随机整数

Question

#Use main and a void function named randnums.
#randnums takes no arguments and return none.
#The randnums function generates 6 random integers between 1 and 9.
#The total should be printed on a new line.
#Main should call the randnums function.

import random
total=0

def main():
    randnums()

def randnums():
    for nums in range(6):
        nums=random.randrange(1,10)
        total=total+nums
        print(nums,end=' ')
    print("\nThe total is:",total)

main()

I keep getting:

local variable 'total' referenced before assignment

Or when total=nums it only shows the last int generated.

Can someone please explain to a beginner what I'm doing wrong?

Answer 1

When you assign to a variable inside a function, Python interprets it as local variable to that function. So when you do -

total=total+nums

You are actually trying to access the local variable total before defining it.

Based on your program, does not look like you need total to be a global variable, you can simply define it as 0 at the start of randnums() . Example -

def randnums():
    total = 0
    for nums in range(6):

Answer 2

You are facing problem because of variable scope.

total=total+nums

Notice that line, in your local scope, total doesn't exist but you are trying to get it's value and then add some num with it, which is the cause of your error.

If you really want to use it, use it like below:

global total
total=total+nums

So, that it recognises the global total variable.