The basic method of using the len function to calculate the length of an object in Python

Basic usage of the len() function in Python

In Python, the len() function is one of the most commonly used functions. It is used to return the length or number of elements of an object (string, list, tuple, etc.). This article will introduce the basic use of the len() function and provide some specific code examples.

1. Basic syntax of the len() function

The syntax of the len() function is very simple and only accepts one parameter, which is the object whose length needs to be calculated.

The syntax format is as follows:
Length = len (object)

Among them, the object can be a string, list, tuple, etc.

2. Example of calculating the length of a string

The following is a sample code for calculating the length of a string:

s = "Hello, World!"
length = len(s)
print("字符串长度为：", length)

Running result:

字符串长度为： 13

In the above code, the variable s stores a string "Hello, World!", calculates the length of the string by calling the len() function, assigns the result to the variable length, and finally prints out the length of the string.

3. Example of calculating the length of a list

The following is a sample code for calculating the length of a list:

my_list = ['apple', 'banana', 'orange']
length = len(my_list)
print("列表长度为：", length)

Running result:

列表长度为： 3

In the above code, the variable my_list stores a list containing 3 elements. The length of the list is calculated by calling the len() function, the result is assigned to the variable length, and finally the length of the list is printed.

4. Example of calculating tuple length

The following is an example code for calculating tuple length:

my_tuple = (1, 2, 3, 4, 5)
length = len(my_tuple)
print("元组长度为：", length)

Run result:

元组长度为： 5

In the above code, the variable my_tuple stores a tuple containing 5 elements. The length of the tuple is calculated by calling the len() function, the result is assigned to the variable length, and finally the length of the tuple is printed.

It should be noted that the len() function calculates differently for immutable objects (such as strings, tuples) and mutable objects (such as lists). For immutable objects, the len() function directly returns the length of the object; for mutable objects, the len() function returns the number of elements in the object.

Summary:
The len() function is a very commonly used function in Python, used to calculate the length or number of elements of an object. It can be applied to various objects such as strings, lists, tuples, etc. This article introduces the basic syntax and usage of the len() function, and provides specific code examples, hoping to help readers better understand the usage of the len() function.

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