encoding int to chr in python and vice versa

1# encode the text and map each character to an integer and vice versa
2
3# we create two dictionaries:
4# 1. int2char, which maps integers to characters
5# 2. char2int, which maps characters to unique integers
6chars = tuple(set(text))
7int2char = {ind:char for ind,char in enumerate(chars)}
8char2int = {char:ind for ind,char in enumerate(chars)}
9
10# encode the text
11encoded = np.array([char2int[ch] for ch in text])