Problem with simple while loop in python (indentation)

Question

while 1 == 1:                          line(1)
    x = 1                              line(2)
    print(x)                           line(3)
        x = x + 10                     line(4)

I started using python today and I learned that it doesn't use brackets {} like java to close a loop, but it uses indentation for it.

The code above runs only if I delete line(4). How should I modify the code so it runs with the last line? I used the the formatting from netbeans and still doesn't run.

How indentation works in python? I find it very weird that it doesn't use brackets.

Answer 1

just compare syntax difference below between javascript and python.

javascript:

function foo() {
    for (var i=0; i<10; i++) {
        console.log(i);
    }
}

python

def foo():
    for i in range(10):
        print i

In your case

your code

while 1 == 1:                          
    x = 1                           
    print(x)                           
        x = x + 10  

equivalent javascript code

while(1==1){
var x=1;
console.log(x) {  
     x = x + 10 ;
     }
}

which doesn't make sense. It should be

while(1==1){
var x=1;
console.log(x);
x = x + 10 
}

equivalent python code

while 1 == 1:                          
    x = 1                           
    print(x)                           
    x = x + 10

I just tried to correct your indentation problem but actually above code is invalid if you are looking for increment because x=1 assignment is inside loop which mean print(x) always prints 1

Corrected Code

x = 1 
while 1 == 1:
    print(x)
    x = x + 10