[Python] How to Count List Elements [length, duplicates]

2022年10月30日

This article shows how to count list elements.

Contents

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How to count elements in list ( Get list size ).

I show how to count elements in list.

The "len() function" can be used to get the number of elements in list.

The "len() function" is built-in function in Python.

How to write

len( List )

Here is an example code.

list_1 = ["Apple", "Banana", "Orange", "Bana", "Banana"]

print(len(list_1))
# 5

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I show how to count elements in two-dimensional list.

Use the "len() function" even for two-dimensional lists.

If you want to know the number of rows, specify a list as an argument.

If you want to know the number of columns, specify a element of list as an argument.

Here is an example code.

list_2 = [
[11, 12, 13, 14],
[21, 22, 23, 24],
[31, 32, 33, 34],
]

print(len(list_2))
# 3
print(len(list_2[0]))
# 4

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I show how to count the number of specific elements in list.

The "count" method can be used to count the number of specific elements contained in a list.

How to write

List.count( Value )

Here is an example code.

list_1 = ["Apple", "Banana", "Orange", "Bana", "Banana"]

print(list_1.count("Apple"))
# 1
print(list_1.count("Ban"))
# 0

By the way, the following article describes how to search for elements in the list.

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