Programming FAQ — Python 2.7.18 documentation

This document is for an old version of Python that is no longer supported. You should upgrade and read the Python documentation for the current stable release. Is there a source code level debugger with breakpoints, single-stepping, etc.?¶ Yes. The pdb module is a simple but adequate console-mode debugger for Python. It is part of the standard Python library, and is documented in the Library Refer

[ymkjp]

Python の引数にミュータブルなデフォルト値を設定するとオブジェクト間で共有されてしまうの、わざわざドキュメントにも理由（言い訳？）が書いてあるのね。"it’s a matter of taste" は言い逃れとしては苦しい。

[nabetama]

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