n my below data set, I need to find unique sequences and assign them a serial no ..

DataSet :

user    age maritalstatus   product
A   Young   married 111
B   young   married 222
C   young   Single  111
D   old single  222
E   old married 111
F   teen    married 222
G   teen    married 555
H   adult   single  444
I   adult   single  333

unique sequence:

young   married     0
young   single      1
old     single      2
old     married     3
teen    married     4
adult   single      5

After finding the unique values like shown above, if I pass a dataframe like below, newdataframe

user    age maritalstatus  
A      Young   married 
X      young   Single  
D      old     single  
Z      old     married

it should return me the products as a list .

A: [222] - as user A has already purchased 111, the matching sequence contains 222, so returns 222.
X: [111, 222]
D: [] - returns nothing, as there is only one sequence like this, and D has already purchased the product 222, so returns empty.
Z: [111] matches with sequence E, so returned 111

if there is no sequence, like below

user     age     maritalstatus  Y     adult  married

it should return me an empty list

 Y : []

you can use sets - module that provides classes for constructing and manipulating unordered collections of unique elements

have a look: https://docs.python.org/2/library/sets.html