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?
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.
ints are always less than strs
TypeError)You're needlessly checking var twice, and you're trying to compare int and str (because raw_input returns a string), which doesn't work right. Try this:
var=0
while True:
var=int(raw_input('Enter the block number '))
if (var >=1 and var<=100):
print '\nBlock Number : ',var
break
else:
print 'ERROR!!! Enter again.'
You should convert your string to int.
var=0
while (var <1 or var>100):
# I changed here
var=int(raw_input('Enter the block number '))
if (var >=1 and var<=100):
print '\nBlock Number : ',var
else:
print 'ERROR!!! Enter again.'
You're running into an issue that strings (as returned by raw_input) are always greater than integers:
>>> "25" > 100
True
You need to convert your input to an integer first:
var = int(raw_input("Enter the block number "))
Of course, you'll want to be resilient in the face of bad input, so you'll probably want to wrap the whole thing in a try block.
hello you need to enter "break" and also var should be an integer, see below
while True:
var=int(raw_input('Enter the block number '))
if (var >=1 and var<=100):
print '\nBlock Number : ',var
break
else:
print 'ERROR!!! Enter again.'
continue
hope this helps
