Home Backend Development Python Tutorial Python's len function is used to calculate the size of objects such as strings, lists, and tuples.

Python's len function is used to calculate the size of objects such as strings, lists, and tuples.

Jan 13, 2024 pm 12:03 PM
python String calculation len function

Pythons len function is used to calculate the size of objects such as strings, lists, and tuples.

The len function in Python is used to calculate the length of strings, lists, tuples and other objects

In Python, we often need to know a string, The length of an object such as a list or tuple so that the corresponding operation can be performed. At this time, we can use the len function to help us calculate the length of the object.

The len function is one of Python's built-in functions. Its function is to return the length of a given object. It works on strings, lists, tuples, and other objects that support sequence operations. When using the len function, you need to pass the object to be calculated as a parameter to the function, and then the function will return the length of the object.

The following are some specific code examples to show the use and effect of the len function:

  1. Calculate the length of the string
str1 = "Hello World"
length = len(str1)
print("字符串的长度为:", length)
Copy after login

Output:

字符串的长度为: 11
Copy after login
  1. Calculate the length of the list
list1 = [1, 2, 3, 4, 5]
length = len(list1)
print("列表的长度为:", length)
Copy after login

Output:

列表的长度为: 5
Copy after login
  1. Calculate the length of the tuple
tuple1 = (1, 2, 3, 4, 5)
length = len(tuple1)
print("元组的长度为:", length)
Copy after login

Output:

元组的长度为: 5
Copy after login

In addition to strings, lists, and tuples, the len function can also be used for other objects that support sequence operations, such as sets and dicts. For a collection, the len function will return the number of elements in the collection; for a dictionary, the len function will return the number of key-value pairs in the dictionary.

  1. Calculate the length of the set
set1 = {1, 2, 3, 4, 5}
length = len(set1)
print("集合的长度为:", length)
Copy after login

Output:

集合的长度为: 5
Copy after login
  1. Calculate the length of the dictionary
dict1 = {"name": "Tom", "age": 25, "gender": "male"}
length = len(dict1)
print("字典的长度为:", length)
Copy after login

Output:

字典的长度为: 3
Copy after login

It should be noted that the len function can only be used for immutable objects. For length calculations of variable objects (such as lists and dictionaries), whether the object has changed must also be considered. If the object is modified before the len function calculates the length, the length returned by the len function will be the length before the modification.

Summary:

The len function is a function used in Python to calculate the length of objects such as strings, lists, and tuples. It can easily obtain the number of elements in the object. Its use is very simple, just pass the object to be calculated to the len function. Whether it is a string, list, tuple, set or dictionary, we can use the len function to calculate their length.

The above is the detailed content of Python's len function is used to calculate the size of objects such as strings, lists, and tuples.. For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

PHP and Python: Different Paradigms Explained PHP and Python: Different Paradigms Explained Apr 18, 2025 am 12:26 AM

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

Choosing Between PHP and Python: A Guide Choosing Between PHP and Python: A Guide Apr 18, 2025 am 12:24 AM

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

Python vs. JavaScript: The Learning Curve and Ease of Use Python vs. JavaScript: The Learning Curve and Ease of Use Apr 16, 2025 am 12:12 AM

Python is more suitable for beginners, with a smooth learning curve and concise syntax; JavaScript is suitable for front-end development, with a steep learning curve and flexible syntax. 1. Python syntax is intuitive and suitable for data science and back-end development. 2. JavaScript is flexible and widely used in front-end and server-side programming.

PHP and Python: A Deep Dive into Their History PHP and Python: A Deep Dive into Their History Apr 18, 2025 am 12:25 AM

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

Can vs code run in Windows 8 Can vs code run in Windows 8 Apr 15, 2025 pm 07:24 PM

VS Code can run on Windows 8, but the experience may not be great. First make sure the system has been updated to the latest patch, then download the VS Code installation package that matches the system architecture and install it as prompted. After installation, be aware that some extensions may be incompatible with Windows 8 and need to look for alternative extensions or use newer Windows systems in a virtual machine. Install the necessary extensions to check whether they work properly. Although VS Code is feasible on Windows 8, it is recommended to upgrade to a newer Windows system for a better development experience and security.

Can visual studio code be used in python Can visual studio code be used in python Apr 15, 2025 pm 08:18 PM

VS Code can be used to write Python and provides many features that make it an ideal tool for developing Python applications. It allows users to: install Python extensions to get functions such as code completion, syntax highlighting, and debugging. Use the debugger to track code step by step, find and fix errors. Integrate Git for version control. Use code formatting tools to maintain code consistency. Use the Linting tool to spot potential problems ahead of time.

How to run python with notepad How to run python with notepad Apr 16, 2025 pm 07:33 PM

Running Python code in Notepad requires the Python executable and NppExec plug-in to be installed. After installing Python and adding PATH to it, configure the command "python" and the parameter "{CURRENT_DIRECTORY}{FILE_NAME}" in the NppExec plug-in to run Python code in Notepad through the shortcut key "F6".

Is the vscode extension malicious? Is the vscode extension malicious? Apr 15, 2025 pm 07:57 PM

VS Code extensions pose malicious risks, such as hiding malicious code, exploiting vulnerabilities, and masturbating as legitimate extensions. Methods to identify malicious extensions include: checking publishers, reading comments, checking code, and installing with caution. Security measures also include: security awareness, good habits, regular updates and antivirus software.

See all articles