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They are imported
- The reason some files get compiled automatically is because they are imported; for instance, if you use import mylib.py, Python will compile mylib.py so that future import statements run a little faster. If you later change mylib.py, then it will get re-compiled next time it is imported (Python uses the file date to see that this happens.)
stackoverflow.com/questions/471191/why-compile-python-code
The reason some files get compiled automatically is because they are imported; for instance, if you use import mylib.py, Python will compile mylib.py so that future import statements run a little faster.
May 30, 2024 · To create a compiled .pyc file for a module that hasn’t been imported yet, you can use the py_compile and compileall modules in Python. The py_compile module provides a way to manually compile any module, including one that hasn’t been imported yet. To use this module, you can call the py_compile.compile() function and specify the name of ...
- What Are .py and .pyc Files in Python?
- How Is A Compiled File Created in Python?
- Where Are Compiled Files Created When Using Python 3?
- When Do .pyc Files Get updated?
- Can You Delete .pyc files?
- Can You Delete .py Files with Python 2?
- Can You Delete .py Files with Python 3?
- Conclusion
Files with .py extension are Python source files, the files in which you write your Python code. The Python code you write in .py files is not executed in the same format by the machine on which you run your code. Before being executed, the code in the .py files is compiled into .pyc files. Imagine the compilation process as a translation from one ...
We have seen that a compiled (.pyc) file is created when a Python module gets imported. But, what creates compiled Python files? The answer is: it depends on the Python implementation you are using. The reference implementation of Python is called CPython and it’s written in C and Python. In this implementation Python code is compiled into bytecode...
In the previous section we have used Python 2. We have seen that a .pyc file has been created in the same directory of the .py file when importing the module. Note: Considering that Python 2 is very old you should really be using Python 3. In this tutorial I’m also using Python 2 to show you the difference in behaviour between the two versions of P...
Let’s continue working on the example in the previous section. We want to understand when .pyc files get updated. Reopen the Python 3 shell, import the app module and check if anything has changed with the .pyc file: As you can see from the output of the ls command filesize and last modify datefor app.cpython-38.pyc have not changed. Now modify the...
You can delete .pyc files, if you do that and then you import that module again the .pyc file related to that module gets recreated. Here you can see the .pyc created before. Let’s delete it and import the app module again… Python has recreated the .pyc file. It has recompiled the .py file into this .pyc file.
That’s an interesting one… Let’s try to delete the app.pyfile, the file that contains our Python code. What do you think happens if we then try to import the app module? Let’s start with Python 2and before deleting the .py file make sure the .pyc file exists in the same directory of the .py file. If the .pyc file doesn’t exist open the Python 2 she...
Let’s continue where we left in the previous section where we have seen how Python 2 behaves when deleting a .py file. And now let’s use Python 3. The app.py file doesn’t exist already in the current directory, /var/tmp, so we can just open the Python 3 shell and try to import the app module. We get back a weird error bad magic number in ‘app’. Wha...
https://youtu.be/xNQoMKiCok8Well done! Now you know what the difference is between .py and .pyc files in Python. You also know what role .pyc files play in the execution of your Python programs: they are generated by compiling .py files and then they are interpreted. We have also seen how the compilation of .pyc file changes between Python 2 and Py...
May 20, 2024 · Understanding the differences between these two types of files is essential for efficient Python programming and debugging. '.py' files contain human-readable source code written by developers, while '.pyc' files are compiled bytecode generated by the Python interpreter to speed up module loading.
Dec 7, 2021 · How to Identify Compiled Python? The first step in file analysis is to identify its type. Luckily, it’s pretty simple to find out if an executable file is a compiled Python, using the following method: Use the resource section (part of the PE file format) to locate compiled Python identifiers, such as the widely known icon.
Feb 26, 2012 · Python has a compiler! You just don't notice it because it runs automatically. You can tell it's there, though: look at the .pyc (or .pyo if you have the optimizer turned on) files that are generated for modules that you import. Also, it does not compile to the native machine's code.
There are several methods to compile Python code. To create executable files, you can use tools like PyInstaller, cx_Freeze, or py2exe. Additionally, you can compile Python modules using the built-in compile() function.
