# We will test the loops in this file.

# Python also has for and while loop.

# For loop:

names = ["Ramesh", "Suresh", "Ganesh", "Jignesh"]

for name in names:

print name

# prints 0 to 4 using range function which returns a "list"

# passing a single argument works

list = range(5)

for x in list:

print x

print "---"

# print 5 to 10 using range function, which takes two arguments and returns a

# list

list = range(5, 11)

for x in list:

print x

print "---"

# prints 0 to 5, using xrange function, which accepts a single argument

# and returns an "iterator" over a list of

iterator = xrange(6)

for x in iterator:

print x

print "---"

# print 5 to 10 using xrange with two arguments

iterator = xrange(10,15)

for x in iterator:

print x

print "---"

# what happens when float argument is passed to range?

# an error will be returned at below line

#list = range(5.5)

# While loops are the same as in any other language:

print "Begin while loops demo..."

count = 0

while count < 5:

#count++ # count ++ doesn't work in python

count += 1

print count

print "---"

# break statement

print "Let's test the break statement..."

for name in names:

print name

if name == "Suresh":

print "Name found"

break

print "---"

# We'll skip continue, because we rarely use it

# Else can be used in the loops..

# The loop iterates over all the values in the iterable and then else clause

# is executed.

# We can take advantage of this behavior in search functionality.

# If the item we are searching for is not present in the iterable datastrcuture,

# we can raise an error or something in the else part.

for name in names:

# try to find a name that doesn't end with "sh"

if not(name.endswith("sh")):

# this will never be executed because all our names end with "sh"

break

else:

print "Found no names that don't end with sh... well, damn!"

print "---"

# Another simpler example:

# Here, if condition is satisfied. So break will be executed

# loop was never completely iterated over and therefore, else clause of the loop

# will never be executed

for x in range(10):

if x == 5:

print "breaking the loop at: " + str(x)

break;

else:

print "counting loop: " + str(x)

else:

# This will never be executed beause the loop was terminated before it

# could completely iterate over the list.

print "This will not be executed"

print "---"

# Else clause is available for while loop as well

count = 0

while count < 5 :

count += 1

else:

print "Count exceeded "