1. Windows
2. BSD
3. Macintosh
4. Linux

1. Running sample code:

   
   Windows
   c:\> python foobar.py
   
   Linux/Unix/BSD
   user# python foobar.py
                   

   c:\> foobar.exe

2. Comments in code:

   # This is a comment

   ' This is a comment

a = 1               # Integer (>= 32 bit)
b = 1L              # Long (Unlimited precision)
c = 1.1             # Float (Precision determined by arch)
d = 2J              # Complex (Real and imaginary part)
e = "2"             # String
f = foobar(a, b)    # Class instance
        

Dim a As Integer
a = 1                           # Integer (16 bits)
Dim b As Long
b = 1.1                         # Long (32 bits)
Dim e As String
e = "2"                         # String
Dim f As foobar
Set f = CreateObject("Foo.bar") # Class instance
        

1. = Assignment
2. == Evaluation, equals
3. != Evaluation, does not equal
4. + Addition of numbers, concatination of strings
5. - Subtraction
6. % Modulous
7. += Add number to self, concatinate string
8. -= Subtract number to self
9. is Evaluation, exact
   Here is a list every Python operator.

1. = Assignment
2. = Evaluation, equals
3. <> Evaluation, does not equal
4. + Addition of numbers, concatination of strings
5. - Subtraction
6. Mod Modulous
7. i = i + 1 Add number to self, concatinate string
8. i = i - 1 Subtract number to self
9. NA Evaluation, exact

# Simple
if a == 1:
    print ""

# Multiple conditions
if a == 1 and b == 2 or c == 3:
    print ""
elif b == 2:
    print ""
else:
    print ""
        

' Simple
if a = 1 then
    msgbox("")
end if

' Multiple conditions
If a = 1 And b = 2 Or c = 3 Rhen
    Msgbox("")
Else if b = 2 Then
    Msgbox("")
Else
    Msgbox("")
End If        
        

# For loop
for i in xrange(5):
    print i

# While loop
i = 0
while (i <= 5):
    print i
    i += 1
        

' For loop
Dim i As Integer
For i = 0 to 5
    Msgbox(i)
Next

' While loop
Dim i As Integer
i = 0
Do While i <= 5 Do
    Msgbox(i)
    i = i + i
Loop
        

1. Single and Double: There's no difference between single or double quoted strings you can use the appropriate one based on the content of the string to avoid having to escape characters.
   For example you could use "I'm happy" or 'The author "Big Daddy"' as appropriate.

2. Triple: Python also supports triple quoted strings in either single or double quotes. The difference is that they are considered code documentation when placed at the top of a function or class, and can span multiple lines.
3. Raw: Raw strings are prefixed by r or R and differ in that escape sequences are not used.

a = 'This is a simple string'
b = "this is a simple string"
c = "This is a string with two \t\t tabs"
d = """This string
       spans multiple lines"""
e = r"This string does not contain any \t\t tabs"
        

a = "abcdefg"

# First character
print a[0]

# First three characters
print a[0:3]

# Last three characters
print a[-3:]

# Middle three characters
print a[2:5]

# Find the position of a string in another string
print a.find('d')

# Everything to the left of the "d"
print a[0:a.find('d')]

# Convert a string to upper, and lower case
print a.upper(), a.lower()

# A string with the first letter of each word in caps
print "i love to eat apples".title()

# String right justified by dashes
print "Angry baby".rjust(15, '-')

# Last word in a sentence
print "I love apples".rsplit(' ', 1)[1]

# Sentence printed in reverse
a = "I love avacados and apples".split()
a.reverse()
print ' '.join(a)

# Return string without any trainling spaces
print "abcdefg     ".rstrip()

# Replace a specific part of a string
print "I think apple's are the best fruit ever!".replace('apple', 'avacado')

# Replace whole words in a sentence
import re
print re.sub(r'\bby\b', ' BY ', "By the way, I walked by the bicycle shop today.")

# Multiple string replacements (usually you make a function out of this)
r = {'avacados':'oranges', 'apples':'kiwi'}
rc = re.compile('|'.join(map(re.escape, r)))
def translate(match):
    return r[match.group(0)]
print rc.sub(translate, "I love avacados and apples")
        

1. Tuple - Immutable lists
2. List - Mutable lists
3. Dictionary - Key/value pairs

# Create a new list with three elements
a = [1, 2, 6]

# Add one more elements
a.append(3)

# Add three more elements
a.extend([4, 9, 10])

# Loop thru the list
for e in a:
    print e

# Sort the list and print again
a.sort()
for e in a: print e

# Reverse the sort and print again
a.reverse()
for e in a: print e

# Print the first and last elements
print a[0], a[-1]

# Print and remove the last element in
print a.pop()

# Print and remove the first element in
print a.pop(0)

# Create a simple dictionary with two key/value pairs
a = {'color':'red', 'size':12}

# Add another key/value pair
a['price'] = 125.99

# Sort based on the keys
s = a.keys()
s.sort()
for key in s:
    print a[key]

# Sort based on the keys in reverse
s = a.keys()
s.sort()
s.reverse()
for key in s: print a[key]

# Because the items() method returns a tuple, we can also use an alternate style loop
for key, value in a.items():
    print key, value

# Sort based on the values in reverse
s = a.values()
s.sort()
s.reverse()
for value in s: print value

# Conditional statement based on presense/absense of key
a = {'color':'red', 'size':12}
if 'red' == a.get('color'): print True
if 10.00 >= a.get('price', 0.00): print 'greater than'