Apply Custom Classes / Functions on Pandas DataFrames

Question

I have a class DataImporter with a method called getData that I want to apply on a pandas dataframe. The problem: the class / method can just handle single elements.

Imagine I have a DataFrame with three columns id , a and b .

What I actually want to do is something like: (pseudo code)

df["c"] = Class(df["id"]).getData(df["a"], df["b"])

I found out there is something like pandas.Series.apply, but I don't see that it works for the getData part.

Answer 1

我认为您需要按列中的标量apply axis=1应用于过程数据：

df["c"] = df.apply(lambda x: Class(x["id"]).getData(x["a"], x["b"]), axis=1)