Sometimes, we want to check if a given key already exists in a dictionary with Python.
In this article, we’ll look at how to check if a given key already exists in a dictionary with Python.
How to check if a given key already exists in a dictionary with Python?
To check if a given key already exists in a dictionary with Python, we can use the in operator.
For instance, we write:
d = {"key1": 10, "key2": 23}
if "key1" in d:
print("has key1")
We have the d dictionary.
And we check if there’s an entry with key 'key1' by writing:
"key1" in d
Since this is True, we see 'has key1' logged.
Conclusion
To check if a given key already exists in a dictionary with Python, we can use the in operator.
