計算一個值出現在 dataframe 列末尾的頻率 [英]count the frequency that a value occurs in the end of a dataframe column
計算pandas列中值的頻率,其中另一列中的值相似 [英]Count frequency of value in pandas column where values in another column are similar
當頻率小於3時,如何進行逐列計數和更改值? [英]How can I do column wise counts and change value when the frequency is less than 3?