python - function that takes one column value and returns another column value -


apologies, if duplicate please let me know, i'll gladly delete.

my dataset: 

index     col 1      col 2  0         1       4, 5, 6    1         2       7, 8, 9 2         3       10, 11, 12    3         4       13, 14, 15

i attempting create function take particular column 1 value input , output column 1 value corresponding column 2 values.

for example, if used function when column 1 equal 3, function return list of 4 values: 3, 10, 11, 12

many thanks

def f(a):     return df.loc[df['col 1'] == a, 'col 2'].item()

but if need more general:

print (df)    col 1       col 2 0      1     4, 5, 6 1      1     7, 8, 9 2      3  10, 11, 12 3      4  13, 14, 15  def f(a):     = df.loc[df['col 1'] == a, 'col 2']     #for no match     if a.empty:         return 'no match'     #for multiple match     elif len(a) > 1:         return     else:     #for match 1 value         return a.item()  print (f(1)) 0    4, 5, 6 1    7, 8, 9 name: col 2, dtype: object  print (f(3)) 10, 11, 12  print (f(6)) no match

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