Python Dictionary Tutorials
Python – Dictionary example
Basics of a Dictionary
Python – Create a dictionary
Python – Create an empty dictionary
Python – Add item to dictionary
Python – Print dictionary
Python – Dictionary length
Python – Dictionary comprehension
Python - Copy dictionary using Dictionary Comprehension
Access / Traverse Dictionaries
Python – Accessing dictionary
Python – Iterate over dictionary
Python – Loop through key, value in dictionary
Python – Loop through dictionary keys
Python – Loop through dictionary values
Python – Print dictionary keys
Python – Print dictionary values
Update Dictionary
Python – Update dictionary
Python – Merge two dictionaries
Python – Concat dictionary
Python – Delete specific key in dictionary
Python – Remove key based on value in dictionary
Python – Clear or empty a dictionary
Checking Operations on Dictionary
Python – Check if dictionary is empty
Python – Check if dictionary contains specific key
Python – Check if dictionary contains specific value
Conversions to and from Dictionary
Python – Convert dictionary keys to list
Python – Convert dictionary values to list
Python – Convert dictionary to list
Dictionary Methods
Python Dictionary Methods
Python Dictionary clear()
Python Dictionary copy()
Python Dictionary fromkeys()
Python Dictionary get()
Python Dictionary items()
Python Dictionary keys()
Python Dictionary values()
Python Dictionary pop()
Python Dictionary popitem()
Python Dictionary setdefault()
Python Dictionary update()
Dictionary Operations
Python – Sort entries in dictionary based on keys
Python – Sort entries in dictionary based on values
Advanced Topics on Dictionaries
Python – List of dictionaries
Python – Dictionary of lists
Python – Nested dictionary
Python – Write dictionary to file
Python Dictionary Comprehension
Python – Unpack dictionary
Python – Swap keys and values in dictionary
Other Tutorials
Are dictionaries ordered in Python?

How to Check if Key Exists in Dictionary in Python?

Check if the Key is present in Python Dictionary

To check if a key is present in a Python Dictionary, you can use in keyword and find out.

In this tutorial, we will learn the syntax used to find out the presence of key in a dictionary, and some working examples.

Syntax to check if a key is in dictionary

Following is the syntax to check if key is present in dictionary. The expression returns a boolean value.

isPresent = key in dictionary

If the key is present in the dictionary, the expression returns boolean value True, else it returns False.

Examples

1. Check if a the key "expertise" is present in the dictionary

Consider a Python Dictionary named myDictionary and we shall check if a key is present or not.

myDictionary = {
	"name": "Lini",
	"year": 1989,
	"expertise": "data analytics"}

isPresent = 'expertise' in myDictionary
print(isPresent)

Output

True

The key expertise is present in myDicitonary, and therefore we got True returned by in statement.

2. Check if key is present in the dictionary - Negative Scenario

In this example, we will try out a negative scenario where key is not present in the Python Dictionary.

myDictionary = {
	"name": "Lini",
	"year": 1989,
	"expertise": "data analytics"}

isPresent = 'place' in myDictionary
print(isPresent)

Output

False

The key place is not present in myDictionary.

Summary

In this tutorial of Python Examples, we learned how to check if a key is present or not in a Python Dictionary with the help of well detailed examples.