string manipulation

[scidam]

Your task is quite sophisticated ...

Lets consider your translation table

my_dict = { 'He':'x', 'l':'y', 'd':'n', 'o ':'g', ' fri':'t', 'nd!': 'q', 'e':'T'}

It is an unordered set of keys and values (dicts are unordered structures in Python), so
performing translation of the word "Hello" we need to decide how to translate e.g. the "He" term,

He -> x

or

He -> HT

Since the translation table (my_dict) is an unordered structure, it is impossible to solve which
variant of translation is right...