Convert a for loop to a while loop

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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: Statements(s) The program below shows how to print out alphabets in a for loop

for loop: The program below shows how to print out alphabets in a for loop:

 ####################################
#Prints out all lower case alphabets

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

while loop example The program below illustrates how to use while loop

 ############################################
# 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