Detailed example of iterator and iter() function
This article mainly introduces the detailed explanation and examples of python iterators and iter() functions. Friends in need can refer to the following
Iterators and iter() functions in python
The iterator provides a sequence-like interface for the class sequence object . Python's iteration seamlessly supports sequence objects, and it also allows programmers to iterate over non-sequence types, including user-defined objects. Iterators are very neat to use. You can iterate over objects that are not sequences but represent the behavior of a sequence, such as dictionary keys, lines of a file, etc. The functions of iterators are as follows:
•Provides an extended iterator interface;
•Brings performance enhancements to list iteration;
•Performance improvements in dictionary iteration;
•Create a true iteration interface instead of the original random object access;
•Backwards compatible with all existing user-defined classes and extended objects that simulate sequences and maps;
•Iterate over non-sequence collections (such as maps and files), you can create more concise and readable code
#iter and generator #the first try #================================= i = iter('abcd') print i.next() print i.next() print i.next() s = {'one':1,'two':2,'three':3} print s m = iter(s) print m.next() print m.next() print m.next()
D:\Scirpt\Python\Python AdvancedProgramming>python ch2_2.py
a b c {'three': 3, 'two': 2, 'one': 1} three two one
【Related Recommendations】
1. Free Basic Tutorial on Python
3. Python meets data collection video tutorial
The above is the detailed content of Detailed example of iterator and iter() function. For more information, please follow other related articles on the PHP Chinese website!

Python excels in automation, scripting, and task management. 1) Automation: File backup is realized through standard libraries such as os and shutil. 2) Script writing: Use the psutil library to monitor system resources. 3) Task management: Use the schedule library to schedule tasks. Python's ease of use and rich library support makes it the preferred tool in these areas.

To maximize the efficiency of learning Python in a limited time, you can use Python's datetime, time, and schedule modules. 1. The datetime module is used to record and plan learning time. 2. The time module helps to set study and rest time. 3. The schedule module automatically arranges weekly learning tasks.

Python excels in gaming and GUI development. 1) Game development uses Pygame, providing drawing, audio and other functions, which are suitable for creating 2D games. 2) GUI development can choose Tkinter or PyQt. Tkinter is simple and easy to use, PyQt has rich functions and is suitable for professional development.

Python is suitable for data science, web development and automation tasks, while C is suitable for system programming, game development and embedded systems. Python is known for its simplicity and powerful ecosystem, while C is known for its high performance and underlying control capabilities.

You can learn basic programming concepts and skills of Python within 2 hours. 1. Learn variables and data types, 2. Master control flow (conditional statements and loops), 3. Understand the definition and use of functions, 4. Quickly get started with Python programming through simple examples and code snippets.

Python is widely used in the fields of web development, data science, machine learning, automation and scripting. 1) In web development, Django and Flask frameworks simplify the development process. 2) In the fields of data science and machine learning, NumPy, Pandas, Scikit-learn and TensorFlow libraries provide strong support. 3) In terms of automation and scripting, Python is suitable for tasks such as automated testing and system management.

You can learn the basics of Python within two hours. 1. Learn variables and data types, 2. Master control structures such as if statements and loops, 3. Understand the definition and use of functions. These will help you start writing simple Python programs.

How to teach computer novice programming basics within 10 hours? If you only have 10 hours to teach computer novice some programming knowledge, what would you choose to teach...


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment

PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool

Dreamweaver CS6
Visual web development tools

VSCode Windows 64-bit Download
A free and powerful IDE editor launched by Microsoft

Dreamweaver Mac version
Visual web development tools