What is a .pyc file

The pyc file is a file generated by compiling a Python file. After the py file is compiled into a pyc file, it loads faster and improves the security of the code. The content of pyc is related to the version of python. The pyc files compiled by different versions are different

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What is a pyc file

pyc is a binary file, which is a file generated by compiling a Python file. It is a byte code, Python After the file is turned into a pyc file, the loading speed is improved, and pyc is also a cross-platform bytecode, which is executed by the python virtual machine, which is similar to the concept of JAVA or .NET virtual machine. The content of pyc is related to the version of python. The pyc files compiled by different versions are different. For example, version 2.5 compiles pyc files, while python compiled by version 2.4 cannot be executed.

Why do we need a pyc file

Because the py file can directly see the source code, but under normal circumstances it is impossible for commercial software developed to leak the source code directly, so we need to compile it into pyc file to protect the source code. In addition, pyc files can also be decompiled. The pyc files compiled by different versions are different. This is mainly determined based on the opcode provided in the Python source code.

Generate a single pyc file

Python is a good language. It provides a built-in class library to compile py files into pyc files. This module It's the py_compile module. Next, I will explain how to generate a single pyc file

import py_compile
py_compile.compile(r'H:/game/test.py')

The method used is very simple. As shown above, a py file can be compiled into a pyc file directly in idle (assuming that Windows environment)

compile function syntax:

compile(file[, cfile[, dfile[, doraise]]])

file: indicates the path of the py file that needs to be compiled

cfile: indicates after compilation The pyc file name and path, the default is to add c or o directly after the file file name, o represents the optimized bytecode

dfile: refers to the path where the error message is saved

doraise : There are two values, which are true or false. If it is true, a PyCompileError will be raised. Otherwise, if there is an error in the compiled file, there will be an error, which will be displayed in sys.stderr by default without raising an exception

Generate pyc files in batches

Generally in the project, we will not just compile one py file, but need to compile all the py files in the entire folder into pyc files. This We can achieve this through the following methods:

import compileall
compileall.compile_dir(r'H:/game')

It means that the py files in the game directory and its subdirectories are compiled into pyc files

compileall function syntax:

compile_dir(dir[, maxlevels[, ddir[, force[, rx[, quiet]]]]])

dir: Indicates the location of the folder that needs to be compiled

maxlevels: Indicates the number of levels of subdirectories that need to be recursively compiled. The default is 10 levels, that is, the default will be The py files in the 10th layer subdirectory are compiled into pyc

ddir: Indicates the path where the error message is saved

force: When true, it means that it will be forcibly compiled into a pyc file, even if the pyc file is The latest one will still be forced to compile once

rx: Indicates a regular expression that can exclude unwanted directories, or only directories that meet the conditions will be compiled

quiet: When True When compiled, no information will be printed in the standard output after compilation

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