Map unique strings to integers in Python [duplicate]

Answer 1

You can try:

>>> L = ['apple','bat','apple','car','pet','bat']
>>> l_dict = dict(zip(set(L), range(len(L))))
>>> print l_dict
{'pet': 0, 'car': 1, 'bat': 2, 'apple': 3}
>>> [l_dict[x] for x in L]
[3, 2, 3, 1, 0, 2]