#!/usr/bin/env python
# getting user input
height = int(raw_input("height: "))
while (height < 0 or height > 23):
height = int(raw_input("height: "))
# building the "pyramid"
spaceCount = height
hashCount = 1
for i in range(height):
assert height != 0
hashCount += 1
spaceCount -= 1
print " " * spaceCount,
print "#" * hashCount
The code should keep prompting user if input is not an integer. But how?
You need to catch the exception.
height = 24
while (height < 0 or height > 23):
try:
height = int(raw_input("heightL "))
except ValueError:
print "Height needs to be an integer. Try again."
You can read the input in an endless loop, waiting until the user enters a valid integer. For example:
while True:
try:
val = int(raw_input("Enter an integer:"))
except ValueError:
print "I said an integer"
else:
# ValueError was not thrown, which means the user entered a valid integer
break
