Python

keys() method in dictionary

Click for All Topics

keys() method in dictionary - Python

This method is used to get all the keys of the dictionary.

This method doesn’t take any parameters and returns a view object that contains the list of all keys.

The time complexity of this method is O(1).

When we call this method with an empty dictionary, it gives no error.

You can use it further by type-casting the view object into the list.

Syntax –

dictionary.keys()

Parameters –

return → returns view object that contains the list of keys of the dictionary.

Example 1-

				
					student_marks = {'Anurag':90,'Abhay':92,'Aditya':85,'Naveen':88}
print(student_marks.keys())

# Output -
#  dict_keys(['Anurag', 'Abhay', 'Aditya', 'Naveen'])

In the above example, first we create a dictionary with the student names as the key and marks as the values.

After that call the .keys() method with the dictionary and print the output on the console.

Example 2-

				
					d={'odd':[1,3,5,7,9],'even':[2,4,6,8,10]}
key_names=d.keys()
print(key_names)

# Output -
# dict_keys(['odd', 'even'])

Example 3-

				
					d={}
print(d.keys())

# output -
# dict_keys([])

Example 4- print all keys without using the .keys() method.

				
					dct={'a':1,'b':2,'c':3,'d':4,'e':5}
for i in dct:
	print(i)

# output -
#  a
#  b
#  c
#  d
#  e

Example 5-

				
					# Creating a dictionary
my_dict = {'red': '#FF0000', 'green': '#00FF00', 'blue': '#0000FF'}

# Using the keys() method to get a view object
keys_view = my_dict.keys()

# Printing the original dictionary
print("Original Dictionary:", my_dict)

# Using the view object to iterate over the keys
print("Keys from the View Object:")
for key in keys_view:
    print(key)

# Output -
# Original Dictionary: {'red': '#FF0000', 'green': '#00FF00', 'blue': '#0000FF'}
# Keys from the View Object:
# red
# green
# blue

Python

keys() method in dictionary

keys() method in dictionary - Python

Example 5-

Talk to our Industry Experts for Career Counselling

Company

Platform

Resources

Get in touch