For Loops In Python.

 ines (83 sloc) 1.75 KB

################### For Loop Tutorial ###############

# A List

list1 = ['Vivek', 'Larry', 'Carry', 'Marie']

# To print all elements in list

print(list1[0])

print(list1[1])

print(list1[2])

print(list1[3])

# Output :

# Vivek

# Larry

# Carry

# Marie

# We can do same thing easily using for loop

# for loop runs len(list1) times

# each time item is equal to one elemrnt of list from starting

for item in list1:

print(item)

# Output :

# Vivek

# Larry

# Carry

# Marie

# We can iterate tuple, list of lists, dictionary,

# and many more containers using for loop

# Examples :

# Iterating tuple

list1 = ('Vivek', 'Larry', 'Carry', 'Marie')

for item in list1:

print(item)

# Output :

# Vivek

# Larry

# Carry

# Marie

# Iterating a list of lists

list1 = [ ["Vivek", 1], ["Larry", 2],

["Carry", 6], ["Marie", 250]]

for item in list1:

print(item)

# Output :

# ['Vivek', 1]

# ['Larry', 2]

# ['Carry', 6]

# ['Marie', 250]

# Iterating a dictionary

dict1 = dict(list1)

print(dict1)

# Output :

# {'Vivek': 1, 'Larry': 2, 'Carry': 6, 'Marie': 250}

for item in dict1:

print(item) # It will print only keys

# Output :

# Vivek

# Larry

# Carry

# Marie

# to print both key and value while iterating dictionary

for item, lollypop in dict1.items():

print(item, "and lolly is ", lollypop)

# Output :

# Vivek and lolly is 1

# Larry and lolly is 2

# Carry and lolly is 6

# Marie and lolly is 250

# Quiz time :

# Ques : Create a list if item in list is numerical

# and number is greater than 6

# Solution

items = [int, float, "HaERRY", 5,3, 3, 22, 21, 64, 23, 233, 23, 6]

for item in items:

if str(item).isnumeric() and item>=6:

print(item)

# Remember str(item).isnumeric() is correct

# item.isnumeric() is wrong

# Output :

# 22

# 21

# 64

# 23

# 233

# 23

# 6