1 print 'hello world'

   1 name = raw_input('What is your name?\n') # \n is a newline
   2 print 'Hi', name

   1 my_list = ['john', 'pat', 'gary', 'michael']
   2 for i, name in enumerate(my_list):
   3     print "iteration %i is %s" % (i, name)

   1 parents, babies = (1, 1)
   2 while babies < 100:
   3     print 'This generation has %d babies' % babies
   4     parents, babies = (babies, parents + babies)

   1 def greet(name):
   2     print 'hello', name
   3 greet('Jack')
   4 greet('Jill')
   5 greet('Bob')

   1 import re
   2 for test_string in ['555-1212', 'ILL-EGAL']:
   3     if re.match(r'^\d{3}-\d{4}$', test_string):
   4         print test_string, 'is a valid US local phone number'
   5     else:
   6         print test_string, 'rejected'

   1 prices = {'apple': 0.40, 'banana': 0.50}
   2 my_purchase = {
   3     'apple': 1,
   4     'banana': 6}
   5 grocery_bill = sum(prices[fruit] * my_purchase[fruit]
   6                    for fruit in my_purchase)
   7 print 'I owe the grocer $%.2f' % grocery_bill

   1 #!/usr/bin/env python
   2 # This program adds up integers in the command line
   3 import sys
   4 try:
   5     total = sum(int(arg) for arg in sys.argv[1:])
   6     print 'sum =', total
   7 except ValueError:
   8     print 'Please supply integer arguments'

   1 # indent your Python code to put into an email
   2 import glob
   3 # glob supports Unix style pathname extensions
   4 python_files = glob.glob('*.py')
   5 for fn in sorted(python_files):
   6     print '    ------', fn
   7     for line in open(fn):
   8         print '    ' + line.rstrip()
   9     print

   1 import time
   2 now = time.localtime()
   3 hour = now.tm_hour
   4 if hour < 8: print 'sleeping'
   5 elif hour < 9: print 'commuting'
   6 elif hour < 17: print 'working'
   7 elif hour < 18: print 'commuting'
   8 elif hour < 20: print 'eating'
   9 elif hour < 22: print 'resting'
  10 else: print 'sleeping'

   1 REFRAIN = '''
   2 %d bottles of beer on the wall,
   3 %d bottles of beer,
   4 take one down, pass it around,
   5 %d bottles of beer on the wall!
   6 '''
   7 bottles_of_beer = 99
   8 while bottles_of_beer > 1:
   9     print REFRAIN % (bottles_of_beer, bottles_of_beer,
  10         bottles_of_beer - 1)
  11     bottles_of_beer -= 1

   1 class BankAccount(object):
   2     def __init__(self, initial_balance=0):
   3         self.balance = initial_balance
   4     def deposit(self, amount):
   5         self.balance += amount
   6     def withdraw(self, amount):
   7         self.balance -= amount
   8     def overdrawn(self):
   9         return self.balance < 0
  10 my_account = BankAccount(15)
  11 my_account.withdraw(5)
  12 print my_account.balance

   1 import unittest
   2 def median(pool):
   3     copy = sorted(pool)
   4     size = len(copy)
   5     if size % 2 == 1:
   6         return copy[(size - 1) / 2]
   7     else:
   8         return (copy[size/2 - 1] + copy[size/2]) / 2
   9 class TestMedian(unittest.TestCase):
  10     def testMedian(self):
  11         self.failUnlessEqual(median([2, 9, 9, 7, 9, 2, 4, 5, 8]), 7)
  12 if __name__ == '__main__':
  13     unittest.main()

   1 def median(pool):
   2     '''Statistical median to demonstrate doctest.
   3     >>> median([2, 9, 9, 7, 9, 2, 4, 5, 8])
   4     7
   5     '''
   6     copy = sorted(pool)
   7     size = len(copy)
   8     if size % 2 == 1:
   9         return copy[(size - 1) / 2]
  10     else:
  11         return (copy[size/2 - 1] + copy[size/2]) / 2
  12 if __name__ == '__main__':
  13     import doctest
  14     doctest.testmod()

   1 import itertools
   2 lines = '''
   3 This is the
   4 first paragraph.
   5 
   6 This is the second.
   7 '''.splitlines()
   8 # Use itertools.groupby and bool to return groups of
   9 # consecutive lines that either have content or don't.
  10 for has_chars, frags in itertools.groupby(lines, bool):
  11     if has_chars:
  12         print ' '.join(frags)
  13 # PRINTS:
  14 # This is the first paragraph.
  15 # This is the second.

   1 import csv
   2 
   3 # write stocks data as comma-separated values
   4 writer = csv.writer(open('stocks.csv', 'wb'))
   5 writer.writerows([
   6     ('GOOG', 'Google, Inc.', 505.24, 0.47, 0.09),
   7     ('YHOO', 'Yahoo! Inc.', 27.38, 0.33, 1.22),
   8     ('CNET', 'CNET Networks, Inc.', 8.62, -0.13, -1.49)
   9 ])
  10 
  11 # read stocks data, print status messages
  12 stocks = csv.reader(open('stocks.csv', 'rb'))
  13 status_labels = {-1: 'down', 0: 'unchanged', 1: 'up'}
  14 for ticker, name, price, change, pct in stocks:
  15     status = status_labels[cmp(float(change), 0.0)]
  16     print '%s is %s (%s%%)' % (name, status, pct)

   1 BOARD_SIZE = 8
   2 
   3 def under_attack(col, queens):
   4     left = right = col
   5     for r, c in reversed(queens):
   6         left, right = left-1, right+1
   7         if c in (left, col, right):
   8             return True
   9     return False
  10 
  11 def solve(n):
  12     if n == 0: return [[]]
  13     smaller_solutions = solve(n-1)
  14     return [solution+[(n,i+1)]
  15         for i in range(BOARD_SIZE)
  16             for solution in smaller_solutions
  17                 if not under_attack(i+1, solution)]
  18 for answer in solve(BOARD_SIZE): print answer

   1 import itertools
   2 
   3 def iter_primes():
   4      # an iterator of all numbers between 2 and +infinity
   5      numbers = itertools.count(2)
   6 
   7      # generate primes forever
   8      while True:
   9          # get the first number from the iterator (always a prime)
  10          prime = numbers.next()
  11          yield prime
  12 
  13          # this code iteratively builds up a chain of
  14          # filters...slightly tricky, but ponder it a bit
  15          numbers = itertools.ifilter(prime.__rmod__, numbers)
  16 
  17 for p in iter_primes():
  18     if p > 1000:
  19         break
  20     print p

   1 dinner_recipe = '''<html><body><table>
   2 <tr><th>amt</th><th>unit</th><th>item</th></tr>
   3 <tr><td>24</td><td>slices</td><td>baguette</td></tr>
   4 <tr><td>2+</td><td>tbsp</td><td>olive oil</td></tr>
   5 <tr><td>1</td><td>cup</td><td>tomatoes</td></tr>
   6 <tr><td>1</td><td>jar</td><td>pesto</td></tr>
   7 </table></body></html>'''
   8 
   9 # In Python 2.5 or from http://effbot.org/zone/element-index.htm
  10 import xml.etree.ElementTree as etree
  11 tree = etree.fromstring(dinner_recipe)
  12 
  13 # For invalid HTML use http://effbot.org/zone/element-soup.htm
  14 # import ElementSoup, StringIO
  15 # tree = ElementSoup.parse(StringIO.StringIO(dinner_recipe))
  16 
  17 pantry = set(['olive oil', 'pesto'])
  18 for ingredient in tree.getiterator('tr'):
  19     amt, unit, item = ingredient
  20     if item.tag == "td" and item.text not in pantry:
  21         print "%s: %s %s" % (item.text, amt.text, unit.text)

   1 BOARD_SIZE = 8
   2 
   3 class BailOut(Exception):
   4     pass
   5 
   6 def validate(queens):
   7     left = right = col = queens[-1]
   8     for r in reversed(queens[:-1]):
   9         left, right = left-1, right+1
  10         if r in (left, col, right):
  11             raise BailOut
  12 
  13 def add_queen(queens):
  14     for i in range(BOARD_SIZE):
  15         test_queens = queens + [i]
  16         try:
  17             validate(test_queens)
  18             if len(test_queens) == BOARD_SIZE:
  19                 return test_queens
  20             else:
  21                 return add_queen(test_queens)
  22         except BailOut:
  23             pass
  24     raise BailOut
  25 
  26 queens = add_queen([])
  27 print queens
  28 print "\n".join(". "*q + "Q " + ". "*(BOARD_SIZE-q-1) for q in queens)