In Python, you use a list to store various types of data such as strings and numbers. A list is identifiable by the square brackets that surround it, and individual values are separated by a comma. To ...

方法②：len () 関数（最もシンプル）: Pythonに標準で備わっているlen ()関数は、リストや文字列の長さを数えるのによく使われますが、実はpandasのデータフレームにも使えます。 len (df)と書くだけで、 行数だけを整数で 返してくれます。

Bug report Bug description: On randomly ordered data, Python's sort ends up artificially forcing all initial runs to length minrun, whose value is a function of len (list), picked in a cheap way to ...