错误：无法分配给函数调用

Question

I am trying to make a simple calculator for addition, and am experiencing a problem.

print('welcome to calculator')      # Print opening message
print(' ')  #Spacer
int(sum1) = input('number') # Get input for first number, this variable later becomes the sum : ERROR: Can't assign to function call
int(add1) = input('number') # Get input for second number : Assumed error for this line as well
sum1 = sum1 + add1      # Add the variables together to get the sum
print(str(sum1))    # Change the sum to a string and print it
loop = 1    # Set loop to True
while loop == 1:    # Continue the program until user inputs add1 as '0'
    int(add1) = input('number')     # Get value for add1
    if add1 == 0:   # Stop the program when add1 is equal to 0
        loop = 0    # Set loop to false
        break
    sum1 = sum1 + add1  # Add the variables together to get the new sum
    print(str(sum1))    # Change the sum to a string and print it
print('done!')  # Print ending message

The error here is on the third line (And I assume the fourth would have the error too). I originally just had

sum1 = input('number')

but the variable sum1 was being treated as a string, so in line 5 when the variables sum1 and add1 were to be added, it would add the strings to the ends of each other. (Example: 15 + 10 = 1510)

Am I doing something wrong when I'm converting the variable to an integer, or is this the wrong way to get past the issue?

Answer 1

You are trying to assign to the result of an int() function call:

int(sum1) = input('number')

Everything on the left-hand side of the = sign should be a target to store the result produced by the right-hand side, and you are asking Python to store something in int(sum1) .

If you wanted to convert the result of the input() call to an integer, you'll need to apply it to the return value of the input() call, not the variable in which you are storing that result:

sum1 = int(input('number'))

The same applies to both add1 cases in your code; use:

add1 = int(input('number'))

Now the right-hand side expression produces an integer result, to be stored in sum1 and add1 respectively.

Answer 2

The statement int(sum1) = input('number') is invalid and should be sum1 = int(input('number')) in the second case you're casting the input into an int - which is what you want. In the first case you're trying to cast a function - what Python is complaining about.

Also this should be changed everywhere in your code !

Answer 3

您必须将其转换为整数，这是正确的方法。

x = int(input("something"))