Python For Loop Examples

 
for var in list:
   statement-1 
   statement-2 
   statement-N

#!/usr/bin/python
#
# for-loop.py: Sample for loop to print welcome message 3 times
#
for i in '123':
        print "Welcome",i,"times"

#/usr/bin/python
i=1
while i <= 3:
	print "Hello World,",i," times."
	i += 1

#!/usr/bin/python
# Nested for loop example
 
### Outer for loop ###
for x in xrange(1,5 ):
    ### Inner for loop	 ###
    for y in xrange(1, 5):
        print '%d ' % (x),
    print

#!/usr/bin/python
# Python for loop using range()
 
print "*** Generates a list of 3 values starting from 0 ***"
for i in range(3):
        print "Welcome",i,"times."
 
print "*** Generates a list of 3 values starting from 1 ***"
for i in range(1,4):
        print "Welcome",i,"times."

#!/usr/bin/python
# Python for loop using range()
 
print "*** Generates a list of 3 values starting from 0 using xrange() ***"
for i in xrange(3):
        print "Welcome",i,"times."
 
print "*** range() vs xrange() ***"
print "range() creates a list containing numbers all at once."
print "xrange() creates a list containing numbers as needed."

#!/usr/bin/python
# Sample for loop using a List
 
## define a list 
shuttles = ['columbia', 'endeavour', 'challenger', 'discovery', 'atlantis', 'enterprise', 'pathfinder' ]
 
## Read shuttles list and store the value of each element into s and display on screen
for s in shuttles:
        print s

#!/usr/bin/python
# A list of shuttles 
shuttles = ['columbia', 'endeavour', 'challenger', 'discovery', 'atlantis', 'enterprise', 'pathfinder' ]
 
## Read shuttles list and enumerate into index and value 
for index, value in enumerate(shuttles):
        print index, value

#!/usr/bin/python
 
# define a dict data type for our dns server as geoLocation : DNS server name
dnsservers = {"us":"ns1.cyberciti.com", "uk":"ns2.cyberciti.biz", "asia":"ns3.cyberciti.org"  }
 
# Python for loop for key,value using dict data type
for location, server in dnsservers.iteritems():
	print server, "dns server is located in" , location

#!/usr/bin/python
## Dict data type
dnsservers = {"us":"ns1.cyberciti.com", "uk":"ns2.cyberciti.biz", "asia":"ns3.cyberciti.org"  }
 
## Is location found ? 
found = False 
 
## INPUT: Search for a geo location 
search_ns_location = raw_input("Provide geo location ")
 
## Use for loop to search geo location for ns
for location, server in dnsservers.iteritems():
	if location == search_ns_location:
		print server, "dns server is located in" , search_ns_location
		found = True
 
## Display an error 
if found == False :
	print search_ns_location ,"not a valid geo location."

#!/usr/bin/python
# Use while loop as follows to run from 1 (i=1) to infinity
# The following will run infinity times 
i=1
while True:
	print "Welcome", i, "times. To stop press [CTRL+C]"
	i += 1

#!/usr/bin/python
# Use while loop as follows to run from 1 (i=1) to infinity
# The following will run infinity times 
import time
i=1
while True:
	print "Welcome", i, "times. To stop press [CTRL+C]"
	i += 1
        # Delay for 2 seconds
        time.sleep(2)

#!/usr/bin/python
# Use while loop as follows to run from 1 (i=1) to infinity
# The following will run infinity times 
import time
i=1
while True:
	print "Welcome", i, "times. To stop press [CTRL+C]"
	i += 1
        #### Delay for 2 seconds ####
        time.sleep(2)
        #### Die (early exit) if i is 5 ####
        if i == 5:
             print "Early exit detected...terminating infinity"
             break