Python list.count Method: Usage and Examples

A stock receipt may contain the same product code more than once.

What You Need to Understand

list.count(value) returns how many elements compare equal to the requested value. It is not a count of distinct values or substrings.

When to Use It

A stock receipt may contain the same product code more than once.

Step-by-Step Python Example

codes = ["A1", "B2", "A1", "C3"]
print(codes.count("A1"))
print(codes.count("D4"))

How the Example Works

The first call returns 2 and the second 0. Counting does not modify the list.

Example Output

2
0
2

A Second Example

Compare this smaller variation with the main example, then experiment with your own values.

scores = [8, 9, 8, 10]
print(scores.count(8))

Important Behavior and Edge Cases

count() uses equality, so values such as True and 1 compare equal. Repeated counts across huge lists can be expensive.

Try It Yourself

Count how often a chosen score appears in a list.

Common Beginner Mistakes

• count() uses equality, so values such as True and 1 compare equal. Repeated counts across huge lists can be expensive.
• Using the wrong collection method for this operation without checking whether it mutates the object, returns a result, or raises on missing data.

Key Takeaways

• list.count(value) returns how many elements compare equal to the requested value.
• The first call returns 2 and the second 0.
• count() uses equality, so values such as True and 1 compare equal.