AttributeError: 'int' object has no attribute 'map'

Question

I have a function as defined below:

def season_map(x):
    return x.map({1:'spring',2:'summer',3:'fall',4:'winter'})

Now on calling the function on season column which only contains values 1, 2, 3 or 4:

bike_data['season'] = bike_data['season'].apply(season_map)

The error given is: AttributeError: 'int' object has no attribute 'map'

But if I try:

bike_data['season'] = bike_data['season'].map({1:'spring',2:'summer',3:'fall',4:'winter'})

It works perfectly!

Unable to understand what is the difference in the 2 approaches apart from syntax....

Pravan Pinto · Accepted Answer · 2021-09-26 12:29:30Z

1

My first answer/post. I was solving this problem today. The answer is you need to pass the particular column as a list:

    def season_map(x):
        return x.map({1:'spring',2:'summer',3:'fall',4:'winter'})
    bike_data[['season']] = bike_data[['season']].apply(season_map)

answered Sep 26, 2021 at 12:29

Pravan Pinto

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1 Comment

Preetha Pinto Over a year ago

Worked like a charm :)

Roelant · Accepted Answer · 2020-10-02 13:45:25Z

0

The map function gets the integer, but has a map as well. Probably just a copy paste error.

Try

def season_map(x):
    return {1:'spring', 2:'summer', 3:'fall', 4:'winter'}[x]

Or easier

season_map = {1:'spring', 2:'summer', 3:'fall', 4:'winter'}
bike_data['season'] = bike_data['season'].map(season_map)

answered Oct 2, 2020 at 13:45

Roelant

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