Agent Skills: lc-python

File a LeetCode **Python** solution into this repo the way the existing ones are filed — find the problem's real slug, write the Python file in the house layout (problem docstring, V0 with an IDEA block and a time/space line; the standard, readable approach with explanatory comments and no clever syntactic sugar; every other good approach filed as V1, V2, …), smoke-test it against the examples, and insert the README row. Use when asked to "add LC <number>" in Python, to file a problem just solved in a weekly contest, to turn a pasted draft into a committed solution, or to wire an existing solution file into README. For the Java counterpart use lc-java instead. Triggers - "add LC 4038 to Hash_table", "/lc-python 239 slide_window", "add this python solution and update the README", "file yesterday's contest Q1".