根据条件从数据框中的现有列创建新列

Question

Create a new column based on the below criteria. Data Type for column A is String

If there exists a text in column A string. Create column B which contains only the string. eg: Column A: This product is used for pipefitter Desired: if column A contains pipefitter Column B = pipefitter

"""df["New_text"] = []
def update_text(selected_text):
    for text in df['Activity Name']:
        if selected_text in text:
            df['New_text'] = df['New_text'].append('text')"""

Answer 1

So if i understand correctly. You have a column Activity Name in your dataframe and you want to write a method which would each time print a subset of a dataframe which has a particular keyword.

If my understanding is right then.

def update_text(df, selected_text):
    return df[df["Activity Name"].str.contains(selected_text)]