Diff for "SimplePrograms"

Differences between revisions 8 and 71 (spanning 63 versions)

Here are some example simple programs. Please feel free to contribute, but see notice at bottom, please.

These examples assume version 2.4 or above of Python. You should be able to run them simply by copying/pasting the code into a file and running Python. Or by inserting this line (#!/bin/env python) at the beginning of your file (Unix/Linux), making the file executable (chmod u+x filename.py) and running it (./filename.py).

1 line: Output

   1 print 'hello world'

2 lines: Input, assignment, comments

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

3 lines: For loop, builtin enumerate function

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

4 lines: Fibonacci, tuple assignment

-  ⇤ ← Revision 8 as of 2007-05-27 02:45:45 → 
  Size: 3775
  Editor: c-68-55-114-201
  Comment:
+   ← Revision 71 as of 2007-07-29 20:15:06 → ⇥
  Size: 1079
  Editor: 196-11-241-97
  Comment: Translator please use sepedi language to label heading (e.g  send for romela )
-Deletions are marked like this.
+Additions are marked like this.
 Line 1:
-These Python examples follow the convention that each program gets one line longer than the one before it.  Please try to maintain this convention.  I also try to introduce at least one new feature in each program.
+Here are some example simple programs.  Please feel free to contribute, but see notice at bottom, please.
 Line 3:
+These examples assume version 2.4 or above of Python.
You should be able to run them simply by copying/pasting the code into a file and running Python. Or by inserting this line (#!/bin/env python) at the beginning of your file (Unix/Linux), making the file executable (chmod u+x filename.py) and running it (./filename.py).
-Line 4:
+Line 6:
-{{{
    ------ 1
    print 'hello world'
+    ------ 1 line: Output
{{{#!python
print 'hello world'
}}}
-Line 8:
+Line 11:
-    ------ 2
    for name in ('peter', 'paul', 'mary'):
        print name
+    ------ 2 lines: Input, assignment, comments
-Line 12:
+Line 13:
-    ------ 3
    # This is a Python comment. \n is a newline
    name = raw_input('What is your name?\n')
    print 'Hi', name
+{{{#!python
name = raw_input('What is your name?\n') # \n is a newline
print 'Hi', name
}}}
-Line 17:
+Line 18:
-    ------ 4
    parent_rabbits, baby_rabbits = (1, 1)
    while baby_rabbits < 100:
        print 'This generation has %d rabbits' % baby_rabbits
        parent_rabbits, baby_rabbits = (baby_rabbits, parent_rabbits + baby_rabbits)
+    ------ 3 lines: For loop, builtin enumerate function
{{{#!python
my_list = ['john', 'pat', 'gary', 'michael']
for i, name in enumerate(my_list):
    print "iteration %i is %s" % (i, name)
}}}
-Line 23:
+Line 25:
-    ------ 5
    # def defines a method in Python
    def tax(item_charge, g = 0.05):
        return item_charge * g
    print '%.2f' % tax(11.35)
    print '%.2f' % tax(40.00, 0.08)


    ------ 6
    import re
    for test_string in [ '555-1212', 'ILL-EGAL']:
        if re.match('\d\d\d-\d\d\d\d$', test_string):
            print test_string, 'is a valid US local phone number'
        else:
            print test_string, 'rejected'

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


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


    ------ 9
    # indent your Python code to put into an email
    import glob
    python_files = glob.glob('*.py')
    python_files.sort()
    for fn in python_files:
        print '    ------'
        for line in open(fn):
            print '    ' + line.rstrip()
        print

    ------ 10
    import time
    now = time.localtime()
    hour = now.tm_hour
    if hour < 8: print 'sleeping'
    elif hour < 9: print 'commuting'
    elif hour < 17: print 'working'
    elif hour < 18: print 'commuting'
    elif hour < 20: print 'eating'
    elif hour < 22: print 'resting'
    else: print 'sleeping'

    ------ 11
    REFRAIN = '''
    %d bottles of beer on the wall,
    %d bottles of beer,
    take one down, pass it around,
    %d bottles of beer on the wall!
    '''
    bottles_of_beer = 99
    while bottles_of_beer > 1:
        print REFRAIN % (bottles_of_beer, bottles_of_beer,
            bottles_of_beer - 1)
        bottles_of_beer -= 1

    ------ 12
    def sieve_of_eratosthenes(candidates):
        i = 0
        while True:
            divisor = candidates[i]
            if divisor * divisor > candidates[-1]:
                return candidates
            else:
                i += 1
            candidates = candidates[:i] + \
                [num for num in candidates[i:]
                    if num % divisor != 0]
    print sieve_of_eratosthenes(range(2,100))

    ------ 13
    # Let's write reusable code, and unit test it.
    def add_money_correctly(amounts):
        # do arithmetic in pennies so as not to accumulate float errors
        pennies = sum([round(int(amount * 100)) for amount in amounts])
        return float(pennies / 100.0)
    if __name__ == '__main__':
        for test_args, result in (
                ([0.13, 0.02], 0.15),
                ([100.01, 99.99], 200),
                ([0, -13.00, 13.00], 0)):
            if add_money_correctly(test_args) != result:
                print 'test failed'
                break

}}}
+    ------ 4 lines: Fibonacci, tuple assignment
{{{#!python
parents, babies = (1, 1)
while babies < 100:
    print 'This generation has %d babies' % babies
    parents, babies = (babies, pa
----
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