pyc | 易学教程

How to find out the magic number for the .pyc header in Python 3

阅读更多关于 How to find out the magic number for the .pyc header in Python 3

问题 Python bytecode (.pyc) files have a header that starts with a magic number that changes between Python versions. How can I (programmatically) find out that number for the current Python version in order to generate a valid header? I'm currently hard-coding the one for Python 3.7.1, but that means I now depend on a specific Python version. This answer does exactly what I want using py_compile.MAGIC , but that does not seem to exist anymore in Python 3. How can I do the equivalent in Python 3?

Cant seem to decompile “PYC” After running it through pyinstxtractor

阅读更多关于 Cant seem to decompile “PYC” After running it through pyinstxtractor

问题 pyinstxtractor runs to completion without problem, and then suggests to decompress the PYC to get the final .PY file (my goal) However when I tried to use uncompyle2, uncompyle6, and plethora of other tools none of them worked. (Magic Number Mismatch!) Which means that the file outputted is not a .PYC file... I opened the outputted file with a hex editor and I can see the source code decoded from hex however Im not able to extract that code in an efficient manner.. It's filled with .'s which

py文件编译为pyc

阅读更多关于 py文件编译为pyc

什么是pyc文件 pyc是一种二进制文件，是由py文件经过编译后，生成的文件，是一种byte code，py文件变成pyc文件后，加载的速度有所提高，而且pyc是一种跨平台的字节码，是由python的虚拟机来执行的，这个是类似于JAVA或者.NET的虚拟机的概念。pyc的内容，是跟python的版本相关的，不同版本编译后的pyc文件是不同的，2.5编译的pyc文件，2.4版本的python是无法执行的。为什么需要pyc文件这个需求太明显了，因为py文件是可以直接看到源码的，如果你是开发商业软件的话，不可能把源码也泄漏出去吧？所以就需要编译为pyc后，再发布出去。当然，pyc文件也是可以反编译的，不同版本编译后的pyc文件是不同的，根据python源码中提供的opcode，可以根据pyc文件反编译出py文件源码，网上可以找到一个反编译python2.3版本的pyc文件的工具，不过该工具从python2.4开始就要收费了，如果需要反编译出新版本的pyc文件的话，就需要自己动手了（俺暂时还没这能力^--^）,不过你可以自己修改python的源代码中的opcode文件，重新编译python，从而防止不法分子的破解。生成单个pyc文件 python就是个好东西，它提供了内置的类库来实现把py文件编译为pyc文件，这个模块就是 py_compile 模块。使用方法非常简单，如下所示

importing a module in Idle shell

阅读更多关于 importing a module in Idle shell

问题 I'm trying to learn python and I'm having trouble importing a module. I have a .pyc file that I'm trying to import into idle shell called dfa.pyc I have the file in a folder called xyz. I navigate to this folder using: os.chdir('/Users/xxx/Desktop/xyz') So now, if I try to run the command: from dfa import * i get the error: ImportError: No module named dfa If i run the command: os.path.isfile('dfa.pyc') it returns true. Can someone explain how i can get the dfa.pyc file imported? Thanks 回答1:

Changing the directory where .pyc files are created

阅读更多关于 Changing the directory where .pyc files are created

问题 Is there a way to change the directory where .pyc file are created by the Python interpreter? I saw two PEPs about that subject (0304 and 3147), but none seems to be implemented in the default interpreter (I'm working with Python 3). Did I miss something ? 回答1: There's no way to change where the .pyc files go. Python 3.2 implements the __pycache__ scheme whereby all the .pyc files go into a directory named __pycache__ . Python 3.2 alpha 1 is available now if you really need to keep your

Changing the directory where .pyc files are created

阅读更多关于 Changing the directory where .pyc files are created

Remove .pyc files from Git remote repository

阅读更多关于 Remove .pyc files from Git remote repository

问题 Accidentally, I have pushed the .pyc files to the master repository. Now I want to delete them but I can´t do it. Is there any way to remove them directly from the Bitbucket site? 回答1: Remove .pyc files using git rm *.pyc . If this not work use git rm -f *.pyc Commit git commit -a -m 'all pyc files removed' Push git push In future commits you can ignore .pyc files by creating a .gitignore file 回答2: No, you cannot delete them directly from the BitBucket interface but you can delete them in

How to run a Python project using pycache folder?

阅读更多关于 How to run a Python project using __pycache__ folder?

问题 I want to run a Pythonic project using Python compilation ( .pyc or __pycache__ ). In order to do that in Python2 , I haven't any problem. Here is a simplified example in a Python2 project: Project tree: test2 ├── main.py └── subfolder ├── __init__.py └── sub.py Compile: python -m compileall test2 Project tree after the compile: test2 ├── main.py ├── main.pyc └── subfolder ├── __init__.py ├── __init__.pyc ├── sub.py └── sub.pyc As you can see, several .pyc manually generated. Now I can run

Python pyc possible when power cycling?

阅读更多关于 Python pyc possible when power cycling?

问题 Wondering if python is able to institute checks within their compile-phase of a given py to pyc to guard against a corrupt pyc due to sudden power-down of the system(and disk). When the system comes back up will the pyc that may exist be checked for integrity and if its considered suspect, regenerated? 回答1: As far as I know, the compile-to-bytecode process works the same as normal make in how it handles recompilation; it checks if the compiled files are older than the source files, and if

How do virtual machines render GUI?

阅读更多关于 How do virtual machines render GUI?

问题 So I have been doing a lot of reading about execution environments (Python's, JVM...) and I am starting to implement one on my own. It is a register-based environment written in C. I have a basic byte code format defined and the execution is going pretty smooth so far. My question is how does VEs render GUIs. In a more detailed description about my work so far, my VE has a screen buffer (experimenting with it). Every time I poke it, I output the screen buffer completely to know the output. So