loops.md

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Loops

A loop statement allows us to excecute a statement or multiple statements multiple times

for loop

Executes a sequence of statements multiple times and abbreviates the code that manages the loop variable.

syntax

for iterating_var in sequence:
   statements(s)

Example

for letter in 'Python':     # First Example
   print 'Current Letter :', letter

fruits = ['banana', 'apple',  'mango']
for fruit in fruits:        # Second Example
   print 'Current fruit :', fruit

print "Good bye!"

• iterating by sequence

fruits = ['banana', 'apple',  'mango']
for index in range(len(fruits)):
   print 'Current fruit :', fruits[index]

print "Good bye!

while loop

Repeats a statement or group of statements while a given condition is TRUE. It tests the condition before executing the loop body.

Syntax

while expression:
   statement(s)

Example

count = 0
while (count < 9):
   print 'The count is:', count
   count = count + 1

print "Good bye!"

• Infinite loop

A loop becomes infinite loop if a condition never becomes FALSE.

var = 1
while var == 1 :  # This constructs an infinite loop
   num = raw_input("Enter a number  :")
   print "You entered: ", num

print "Good bye!"

• single statement suites

flag = 1
while (flag): print 'Given flag is really true!'
print "Good bye