How to Iterate Dictionary in Python

In Python, Dictionary is an unordered collection of data values. Dictionary holds key:value pair.

To iterate through a dictionary there are several ways:

• Iterate through all keys
• Iterate through all values
• Iterate through all key, value pairs

Iterate through all keys

groupsAndLeaders = {
	'Gryffindor' : 'Abhi',
	'Ravenclaw' : 'Chandh',
	'Hufflepuff' : 'David',
	'Slytherin' : 'Harry'
}

print("List of student groups:\n")

for groupnames in groupsAndLeaders:
	print(groupnames)

Output:

List of student groups:

Gryffindor
Ravenclaw
Hufflepuff
Slytherin

Iterate through all values

groupsAndLeaders = {
	'Gryffindor' : 'Abhi',
	'Ravenclaw' : 'Chandh',
	'Hufflepuff' : 'David',
	'Slytherin' : 'Harry'
}

print("List of student leaders:\n")

for leaders in groupsAndLeaders.values():
	print(leaders)

Output:

List of student leaders:

Abhi
Chandh
David
Harry

Iterate through all key, value pairs

groupsAndLeaders = {
	'Gryffindor' : 'Abhi',
	'Ravenclaw' : 'Chandh',
	'Hufflepuff' : 'David',
	'Slytherin' : 'Harry'
}

print("List of student groups and leaders:\n")

for group, leader in groupsAndLeaders.items():
	print(group, ":", leader)

Output:

List of student groups and leaders:

Gryffindor : Abhi
Ravenclaw : Chandh
Hufflepuff : David
Slytherin : Harry