python replace string with keys in dictionary code example

Example 1: python replace by dictionary

address = "123 north anywhere street"

for word, initial in {"NORTH":"N", "SOUTH":"S" }.items():
    address = address.replace(word.lower(), initial)
print address

Example 2: replace key of dictionary python

a_dict = {"a": 1, "B": 2, "C": 3}

new_key = "A"
old_key = "a"
a_dict[new_key] = a_dict.pop(old_key)

print(a_dict)
OUTPUT
{'B': 2, 'C': 3, 'A': 1}