Combined Example

import sys

while True:

# output to stdout:

print("Yet another iteration ...")

try:

# reading from sys.stdin (stop with Ctrl-D):

number = input("Enter a number: ")

except EOFError:

print("\nciao")

break

else:

number = int(number)

if number == 0:

#Python2: print >> sys.stderr, "0 has no inverse"

print("0 has no inverse", file=sys.stderr)

else:

print("inverse of %d is %f" % (number, 1.0/number))