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/python3
distros = ["RHEL", "Fedora", "Debian", "Ubuntu", "Arch", "Alpine"]
 
for d in distros:
  print("Linux distro name: " + d)

#!/usr/bin/python
# Python 2.x version
# 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/python3
# Nested for loop example
 
### Outer for loop ###
for x in range(1,5 ):
    ### Inner for loop	 ###
    for y in range(1, 5):
        print('%d ' % (x),  end = '')
    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
# Only works with Python 2.x
# There no xrange() function in Python3
# 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 (location),value (nameserver) using dict data type
for location in dnsservers:
    print(dnsservers[location], "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 = input("Provide geo location ")
#print(search_ns_location)
#exit(0)
 
for location in dnsservers:    
    if location == search_ns_location:
        print(dnsservers[location], "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
#!/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
#!/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

#!/usr/bin/python3
for os in ["macOS", "Linux", "Windows10", "FreeBSD", "Unix"]:
    print("OS: ", os)
else:
  print('OS loop list completed. Bye!')