Shulou(Shulou.com)06/03 Report--

1.1 introduction to python

Python is an advanced, object-oriented, interpretive, scripting language.

The high-level language is close to the developer, corresponding to the underlying language, and the underlying language is close to the machine.

Object-oriented corresponds to process-oriented, which is the thinking of developers in the development process and the programmer's world view.

Interpretations correspond to compiled languages. (it needs to execute the script every time, unlike C++ can generate a file, next time you don't have to execute the script.)

Python is a high-level scripting language that combines interpretation, compilation, interactivity and object-oriented.

The design of Python is highly readable. Compared with other languages, it often uses English keywords and some punctuation marks. It has more distinctive grammatical structures than other languages.

Python is an interpreted language: this means that there is no compilation in the development process. Similar to PHP and Perl languages.

Python is an interactive language: this means that you can write your program interactively at a Python prompt.

Python is an object-oriented language: this means that Python supports object-oriented styles or code-encapsulated programming techniques.

Python is a language for beginners: Python is a great language for beginner programmers, supporting a wide range of application development, from simple word processing to WWW browsers to games.

Advantages and characteristics of Python:

1. Learning cost

Low learning cost

Study does not take much time.

The work can be finished after study.

two。 Powerful function

1. Open source, there are many people who support the development of python

2.python has a rich class library.

Built-in module: refers to the module that comes with python after we install python

Tripartite module: the tripartite module is the module we need to install ourselves.

3.python is a language that is highly compatible with other languages.

Modules written in other languages can be easily invoked

Glue language

The development efficiency of 4.python is very high

The development efficiency is high but the operation efficiency is low

We first use python to build a general framework for the entire project, and then write in other languages where operational efficiency is specifically required.

1. Easy to learn: Python has relatively few keywords, a simple structure, and a well-defined syntax, making it easier to learn.

two。 Easy to read: the definition of Python code is clearer.

3. Easy to maintain: the success of Python is that its source code is fairly easy to maintain.

4. A wide range of standard libraries: one of the biggest advantages of Python is its rich libraries, cross-platform, and good compatibility between UNIX,Windows and Macintosh.

5. Interactive mode: interactive mode support, you can enter the execution code from the terminal and get the results of the language, interactive testing and debugging code snippets.

6. Portable: based on its open source nature, Python has been ported (that is, to make it work) to many platforms.

7. Extensible: if you need a critical piece of code that runs fast, or if you want to write algorithms that you don't want to open up, you can use C or C++ to complete that part of the program and call it from your Python program.

8. Database: Python provides interfaces to all major commercial databases.

9.GUI programming: Python supports GUI to create and port to many system calls.

10. Embeddable: you can embed Python into the CumberCraft + program to give users of your program the ability to "scripting".

1.2 comparison between python2 and python3

1. Operation efficiency

Py3.0 runs pystone benchmark 30% slower than py2.5

Py3.1 performance is 15% slower than py2.5

two。 Direction of use

1. Operation and maintenance (2.0)

two。 Development, testing, machine learning

3. Specific adjustment

Coding

Py3.x source files are encoded with utf-8 by default

Print function

Python 3 print has completely become a function

1.3installation of python

1. First, check whether the computer system is 64-bit or 32-bit before installation, and then go to the official website to download it.

Python download

The latest Python source code, binary documents, news and information can be found on the official website of Python:

Python official website: https://www.python.org/

You can download Python documents in the link below. You can download documents in HTML, PDF and PostScript formats.

Download address for Python documents: https://www.python.org/doc/

2.add python 3.5 to path do you want to install version 3.5 into the environment variable, but not in version 2

3. Installation directory should not be set to a Chinese directory

4. Installation completed

5. Verify that python installed successfully cmd---- "python"

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