View source for How to use while & for loops

{{Template:1010ExtraLabs
|Chapter_TOC=[[Extra Labs]]
|Introduction=In this program, you will be learn how to use while and for loop control structures in Python. 
==while and for loops syntax in Python:==

while (expression):
   Statement(s)

for iterating_var in sequence:
   Statement(s)

The two sample programs shown below does the following shows

|Body=

== Sample programs==
<li>for loop example
{{CodeBlock
|Code=####################################
#Prints out all lower case alphabets

letter = 'a'
for i in range (0,26):
    print letter
    letter  = chr(ord(letter) + 1)   
}}

<li>while loop example
The program below illustrates how to use while loop

{{CodeBlock
|Code=############################################
# Ensures that the user enters either of the 
# characters (a, b or c)

## Gets input from th user
message = raw_input("Please enter a, b, or c: ")

while(message != "a" and message != "b" and message != "c"):
    message = raw_input("Please enter a, b, or c:")
print "You entered: " + message
}}
}}