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("yes")
to check if key1 is a key in dict d.
Since key1 is in d, 'yes' will be printed.
Conclusion
To check if a given key already exists in a dictionary with Python, we can use the in operator.
