How to Check if Tuple Exists in a List in Python

Python is a popular programming language due to how simple it is to use its built-in data structures.

The list and tuple data structures are both used to store data in Python.

Sometimes when you have a list of tuples, you want to know if a specific tuple exists in the list.

In this post, we'll learn how you check if your list of tuples contains a specific tuple.

Check if a tuple exists in a list of tuples

To start off, let's define a list of tuples:

PYTHON
list = [
    ("a", "b"),
    ("c", "d"),
    ("e", "f")
]

In this example, we have a 3-element list of tuples, each with a pair of strings.

Let's define the value we want to check:

PYTHON
list = [
    ("a", "b"),
    ("c", "d"),
    ("e", "f")
]

value = ("a", "b")

Now let's check if this value is in the list by using the in keyword.

PYTHON
list = [
    ("a", "b"),
    ("c", "d"),
    ("e", "f")
]

value = ("a", "b")

if value in list:
    print("Value exists in list!")
else:
    print("Value does not exist in list!")

BASH
Value exists in list!

The check will return a boolean value of True if the value exists in the list, or False if it does not.

Since the value was indeed in the list, it returned True and we ran the code block inside, which was just a print statement.

Likewise, if you can test it with a value that does not exist:

PYTHON
list = [
    ("a", "b"),
    ("c", "d"),
    ("e", "f")
]

value = ("g", "h")

if value in list:
    print("Value exists in list!")
else:
    print("Value does not exist in list!")

BASH
Value does not exist in list!

Since the value was not in the list, it returned False and the second code block ran.

Conclusion

In this post, we learned how to check if a tuple exists in a list of tuples.

Simply use the in keyword with your desired value and list to get a boolean.

Thanks for reading!

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