Pandas DataFrame(data,columns,index)の生成

 import pandas as pd

① 列（ ⇩ ） : 辞書指定

 df_col = pd.DataFrame({ 'col_name1' : ['val_11' , 'val_12' , 'val_13'],
                         'col_name2' : ['val_21' , 'val_22' , 'val_23'],
                         'col_name3' : ['val_31' , 'val_32' , 'val_33'],
                        })
 print ( df_col )
 #     col_name1  col_name2  col_name3
 #  0     val_11     val_21     val_31
 #  1     val_12     val_22     val_32
 #  2     val_13     val_23     val_33

② 行（ ⇨ ) : リスト指定

 df_ind = pd.DataFrame([ ['val_11' , 'val_12' , 'val_13'],
                         ['val_21' , 'val_22' , 'val_23'],
                         ['val_31' , 'val_32' , 'val_33'],
                       ])
 print ( df_ind )
 #             0          1          2 
 #  0     val_11     val_12     val_13
 #  1     val_21     val_22     val_23
 #  2     val_31     val_32     val_33


③ 行列 : index , columns指定

 df_colind = pd.DataFrame([ ['val_11' , 'val_12' , 'val_13'],
                            ['val_21' , 'val_22' , 'val_23'],
                            ['val_31' , 'val_32' , 'val_33']],
                          index = [ ind_1 , ind_2 , ind_3 ],
                          columns = [ col_1 , col_2 , col_3 ]
                         )
 print ( df_colind )
#          col_1    col_2    col_3
# ind_1   val_11   val_12   val_13
# ind_2   val_21   val_22   val_23
# ind_3   val_31   val_32   val_33
因みに、　df = pd.DtaFrame()
          print ( df )
          # Empty DtaFrame  #Columns: []  #Index: []