str.extract within a function

Question:

I want to create a function and extract with str.extract the following string from my dataframe: 100 milliliter

But I am unable to create the function. It does work without the function.

I tried:

def extract(str):

    pattern = str.extract('d+ milliliter, str)

return (str)

How can I solve this issue?

Asked By: user20649218

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Source

Answers:

Try it this way.
https://pandas.pydata.org/docs/reference/api/pandas.Series.str.extract.html

def extract(df):
   pattern = '(d*s*milliliter)'
    return df.str.extract(pattern)

extract(df['column_name'])
Answered By: Kylar