This tutorial will explain map function of dataframe object with 3 different use cases.

Map: It iterates over each element

1. Map dictionary object to one column
df["country"] = df["city"].map(city_to_country)


2. Map first_name to new firrst_name
df["new_first_name"] = df["first_name"].map(lambda x : "new_"+x)


3. Map age to new Age
df["new_age"] = df["age"].map(lambda x : 10+x)

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