Question

Below is a piece of code from Python which has been bothering me for a while.

var=0
while (var <1 or var>100):
    var=raw_input('Enter the block number ')
    if (var >=1 and var<=100):
        print '\nBlock Number : ',var 
    else:
        print 'ERROR!!! Enter again.'

The problem is that the while loop iterates continuously without breaking. Can anyone help me how to break the loop.

Is there any way to implement a do..while in Python?

Answer 1

The problem is that raw_input returns a string. You’re comparing a string with an integer which you can do in python 2.x (In python 3, this sort of comparison raises a TypeError), but the result is apparently always False. To make this work you probably want something like var=int(raw_input('Enter the block number'))

From the documentation:

objects of different types always compare unequal, and are ordered consistently but arbitrarily.