print 1/0

try:
    print 1/0
except ZeroDivisionError:
    print 'Error trying to divide by zero.'

import traceback

# Try to get a file name
try:
    fn = raw_input('Nome do arquivo: ').strip()

    # Numbering lines
    for i, s in enumerate(file(fn)):
        print i + 1, s,

# If an error happens
except:

    # Show it on the screen
    trace = traceback.format_exc()

    # And save it on a file
    print 'An error happened:\n', trace
    file('trace.log', 'a').write(trace)

    # end the program
    raise SystemExit

import random

# Creates a file with 25 random numbers
with file('temp.txt', 'w') as temp:
    for y in range(5):
        for x in range(5):
            # "print >> " records command output on the file
            print >> temp, '%.2f' % random.random(),
        print >> temp

# Shows file content
with file('temp.txt') as temp:
    for i in temp:
        print i,

# Out of the blocks, the file will be closed
# The following command generates an exception ValueError: I/O operation on closed file
print >> temp