如何查找模块中特定函数/类的脚本文件路径？以tkinter.Button为例

Great question—this is a common gotcha with Tkinter’s structure, since its code is split between Python wrapper classes and a low-level C extension. Let’s break this down step by step:

1. Double-Check the tkinter/__init__.py File #

You might have missed it! In most standard CPython distributions, the Button class is defined directly in tkinter/__init__.py. It inherits from the Widget class and wraps the underlying Tk button widget.

To confirm, open your tkinter/__init__.py and search for lines like this:

class Button(Widget):
    """Button widget."""
    def __init__(self, master=None, cnf={}, **kw):
        Widget.__init__(self, master, 'button', cnf, kw)

If you don’t see it immediately, look for imports at the top of the file—some older Python versions import Button (and other widgets) from a submodule like tkinter.tkinter with a line like:

from .tkinter import *

In that case, check the tkinter/tkinter.py file in the same directory.

2. The Low-Level Runtime Implementation #

If you’re hunting for the code that directly interacts with the Tk GUI library (the "runtime" component you guessed), that lives in a C extension module, not a plain .py file. This module goes by different names depending on your OS:

• _tkinter.pyd on Windows (in the same tkinter folder)
• _tkinter.so on Linux/macOS
• _tkinter.cpython-<version>-<arch>.so on some systems

Since this is compiled code, you can’t read it as plain text. To view its source, you’d need to access the CPython repository’s Modules/_tkinter/ directory, which holds the C source files for the extension.

3. Don’t Confuse It with ttk.Button #

If you’re using the themed button (ttk.Button), that’s a separate class entirely! It’s defined in tkinter/ttk.py in your Python installation. Double-check which button type your code uses to avoid looking in the wrong place.

Quick Tip to Locate Files Programmatically #

If you’re unsure where your Tkinter files live, run this code to get exact paths:

import tkinter
print(tkinter.__file__)  # Prints the path to __init__.py
print(tkinter.Button.__module__)  # Tells you which module Button originates from

This will point you directly to the file you need to inspect.

内容的提问来源于stack exchange，提问作者Xantium