Python is a great language for doing data analysis, primarily because of the fantastic ecosystem of data-centric python packages. Pandas is one of those packages and makes importing and analyzing data much easier.

Pandas dataframe.replace() function is used to replace a string, regex, list, dictionary, series, number etc. from a dataframe. This is a very rich function as it has many variations.
The most powerful thing about this function is that it can work with Python regex (regular expressions).

Pandas dataframe.replace() : https://www.geeksforgeeks.org/python-pandas-dataframe-replace/