4. Why doesn\'t calling a Python string method do anything unless you assign its output?

Why doesn\'t calling a Python string method do anything unless you assign its output?

Answer

This is because strings are immutable in Python.

Which means that X.replace("hello","goodbye") returns a copy of X with replacements made. Because of that you need replace this line:

X.replace("hello","goodbye")

with this line:

X = X.replace("hello","goodbye")

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