Duplicate elements in a list

Question

I have a list in Python:

l = [\'a\', \'c\', \'e\', \'b\']

I want to duplicate each element immediately next to the original.

Answer 1

Pandas gives a method for duplicated elements:

import pandas as pd
l = pd.Series([2, 1, 3, 1])
print(l.duplicated())
>>>0    False
   1    False
   2    False
   3     True
   dtype: bool

print('Has list duplicated ? :', any(l.duplicated()))
>>>Has list duplicated ? : True