What is PyC file

Hello everyone , I meet you again , I'm your friend, Quan Jun .

It's very simple , use python -m py_compile file.py

python -m py_compile /root/src/{file1,file2}.py Translate it into pyc file . You can also write a script to do this ： Code:

import py_compile py_compile.compile(‘path’) //path Include .py Path to file name

use python -O -m py_compile file.py

Translate it into pyo file . 1. Among them -m Equivalent to... In the script import, there -m py_compile Equivalent to import py_compile 2.-O If change to -OO Delete the corresponding pyo file , Specific help can be entered on the console python -h see

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from:http://blogold.chinaunix.net/u3/93255/showart_1944929.html

What is? pyc file

pyc It's a binary file , By py The file is compiled , Generated files , It's a kind of byte code,py File becomes pyc After the document , The loading speed has increased , and pyc It's a cross platform bytecode , By python The virtual machine to execute , This is similar to JAVA perhaps .NET The concept of virtual machine .pyc The content of , with python The version of , Compiled versions of pyc Documents are different ,2.5 Compilation of pyc file ,2.4 Version of python It can't be carried out .

What is? pyo file

pyo Is to optimize the compiled program python -O The source file can compile the source program into pyo file

What is? pyd file

pyd yes python Dynamic link library for .

Why pyc file

This demand is too obvious , because py You can see the source code directly , If you're developing business software , It's impossible to disclose the source code ？ So it needs to be compiled as pyc after , Release it again . Of course ,pyc Files can also be decompiled , Compiled versions of pyc Documents are different , according to python Provided in the source code opcode, According to pyc Decompile the file to py File source code , You can find a decompile on the Internet python2.3 Version of pyc File tool , But the tool comes from python2.4 There will be a charge at the beginning , If you need to decompile a new version of pyc Word of the file , You need to do it yourself （ I don't have this ability for the time being ^–^）, But you can modify it yourself python In the source code of opcode file , recompile python, So as to prevent criminals from cracking .

Generate single pyc file

python It's a good thing , It provides a built-in class library to implement py The file is compiled as pyc file , This module is py_compile modular .

It's very simple to use , As shown below , Directly in idle in , You can put one py The file is compiled as pyc The file .( Suppose that windows In the environment )

import py_compile

py_compile.compile(r’H:\game\test.py’)

compile The function prototype ：

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

file Indicates that you need to compile py Path to file

cfile Represents compiled pyc File name and path , The default is directly in file Add... After the filename c perhaps o,o Represents optimized bytecode

dfile This parameter cannot be understood in English , Please enlighten me greatly .( Despise Yourself ) original text ：it is used as the name of the source file in error messages instead of file

doraise It can be two values ,True perhaps False, If True, It will trigger a PyCompileError, Otherwise, if there is an error compiling the file , There will be a mistake , The default display is sys.stderr in , Without throwing an exception

( come from python2.5 file )

Batch build pyc file

Generally speaking , Our projects are all in one directory , It's not like compiling just one py The file" , It needs to put the whole folder under py The files are compiled as pyc file ,python Another module is provided for us ：compileall . How to use it is as follows ：

import compileall

compileall.compile_dir(r’H:\game’)

You can also compile files in a directory directly from the command line , Such as ：# python -m compileall /root/src/

This way game Catalog , And its subdirectories py The file is compiled as pyc The file . Hey , It's convenient enough . Take a look compile_dir Function description ：

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

dir Indicates the location of the folder to compile

maxlevels Represents the number of levels of subdirectories that need to be recursively compiled , The default is 10 layer , That is to say, by default 10 In the layer subdirectory py The file is compiled as pyc

ddir I don't understand English , original text ：it is used as the base path from which the filenames used in error messages will be generated.

force If True, Will be forced to compile to pyc, Even now pyc The document is up to date , It also forces compilation once ,pyc The file contains a timestamp ,python The compiler will decide... Based on time , Do you need to regenerate pyc file

rx Represents a regular expression , For example, you can exclude unwanted directories , Or only qualified directories can be compiled

quiet If True, After compiling , Not in standard output , Print out information

( come from python2.5 file )

summary

Use the above method , It's convenient to put py The file is compiled as pyc The file , In this way, part of the source code can be hidden , To ensure the python When doing commercial software , Ensure the safety of some , Keep learning , See how to modify opcode.

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