如果变量具有特定值，如何执行代码？

Question

I have a problem with my code. The language is python. I am trying to use an if statement to execute some code if a variable has a certain value.

op = 5

if(op = 5):
    print("op is 5!")

Every time I run this program, it gives me a syntax error. I have tried doing this instead;

op = 5

if op = 5:
    print("op is 5!")

But it still gives me the error. I am asking this question because I am doing a calculator project and need this.

Answer 1

= is the assignment operator. You're looking for the equality check operator, == :

if op == 5:
    print("op is 5!")

Answer 2

You misspelled the equality check operator.

The equality check operator is == . You put the assignment operator, which is this: = .

The following code will return a SyntaxError :

foo = input('Enter the value of foo: ')
if foo = '5':
    print('foo is equal to 5!')
else:
    print('foo is not equal to 5!')

But this won't:

foo = input('Enter the value of foo: ')
if foo == '5':
    print('foo is equal to 5!')
else:
    print('foo is not equal to 5!')

You just need to change the operator in the if statement to == .

Answer 3

For comparison we used double equal sign ==

Not single

if op == 5:
    print("op is 5!")