20140817_03_HX400V_宜蘭國際童玩節_台灣

Python: pandas.DataFrame 如何找出重複值並計算重複次數? counts = df[duplicates] .groupby(['name']) .size() .reset_index(name='count')

Python四種容器(list, tuple, set, dict)的CRUD(Create創建, Read讀取, Update修改, Delete刪除)

Python: 如何計算全文件詞頻（term frequency，簡稱TF）與逆向檔案頻率（Inverse Document Frequency，簡稱 IDF）?

Python: pandas.DataFrame如何移除所有空白列?if df_raw.iloc[r,0] is np.nan: nanLst.append(r) ; df_drop0 = df_raw.drop(nanLst,axis=0) ; pandas.isna() ;df_drop0 = df_raw.drop(nanLst,axis=0).reset_index(drop=True)

Python: 如何做矩陣乘法? numpy.matmul (ary1, ary2) 或 ary1 @ ary2 或 numpy.dot (ary1, ary2)

$Python 如何做excel的樞紐分析? pandas.DataFrame.groupby() ; .agg( {column name: function name} ) ; 如何讀取多層index的xlsx檔案? df = pandas.read_excel (fpath, index_col =[0,1]) ; 如何顯示所有欄? pd.set_option ( “display.max_columns”, None)$