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This article introduces what the python interpreter is, the content is very detailed, interested friends can refer to, hope to be helpful to you.

Starting from the computer programming language, it is mainly divided into three categories: machine language, assembly language and high-level language.

Machine language is a set of binary instructions that can be directly recognized and executed by computers. Because it can be executed directly to CPU, it is the fastest, but it requires us to remember the code of each instruction and the corresponding action, and think about how difficult it is to operate a string of 01 sequences when we write the code.

In order to overcome the shortcomings of machine language, people use some mnemonics to replace machine code, that is, to use some acronyms similar to the actual meaning to replace actions, such as ADD, SUB, MOV, etc., which has made great progress and can be easily written, but it is still operating on the machine, which is closer to the bottom than the high-level programming language, so assembly language is a low-level language.

Both machine language and assembly language are hardware-oriented operations, they are dependent on machines, and different devices may write in different ways. However, the high-level language is a user-oriented language, as long as we write the program content, by compiling or interpreting the program, we can operate on the machine. The compiler or interpreter mentioned here is a translation tool that translates languages that humans understand into things that machines can understand.

Interpretive language VS compiled language

The common goal of interpretive language and compiled language is to convert the statements we know (such as loops, judgments) into binary code, and then give it to the computer for execution.

The most obvious difference between the two is that after we have written the program, the compiled language completely translates the code into a binary file and executes the program by executing the binary file, while the interpreted language does not transfer the binary file to the binary. it's about when it's needed and when it's compiled. Some people say, what's the difference? Before I finish, after the compiled language generates the binary file, the binary file can be executed directly, and the interpreted language needs to carry this interpreter at any time and must be on call. Therefore, there are differences in various aspects, the following is my understanding of the more obvious differences.

Compiled language

Interpretive language

operational speed

Fast (binary file)

Slow (explain and execute)

Portability (cross-platform)

Poor (error in execution when CPU instruction system changes)

OK (take the interpreter with you)

Update

Recompile

Explain only the updated content

Safety

Good (no need to provide source code)

Poor (delivered with source code)

Python interpreter

With the above description, you must know what's going on with the interpreter. The interpreter actually includes the compilation process, but the compilation process does not generate object code. The Python interpreter consists of a compiler and a virtual machine, which converts the source code into bytecode, which is then executed line by line through the Python virtual machine.

Python program execution process:

1. Execute the .py file, and the python interpreter will be started.

2. The compiler interprets the source file as bytecode

3. The virtual machine converts the bytecode into machine language and interacts with the operating system.

4. After the program is finished, save the byte code to the pyc file for subsequent direct execution.

There are many python interpreters:

CPython:C language development, the most widely used, default interpreter

IPython: interactive interpreter based on CPython

PyPy: using JIT technology to dynamically compile python code in pursuit of execution speed

Jython: an interpreter running on the Java platform that can be directly compiled into Java bytecode for execution

IronPython: similarly Jython, running on .net platform

So much for sharing about what the python interpreter is. I hope the above content can be helpful to you and learn more knowledge. If you think the article is good, you can share it for more people to see.

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