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+--- Thread: [Solved] How to refer to dataframe column name based on a list (/thread-33689.html)
[Solved] How to refer to dataframe column name based on a list - lorensa74 - May-17-2021
I am new to python, so my question may not have the correct terminology. I hope my intent is clear enough.
ma_list = [5,10]
----
A. Based on ma_list, I created two new columns (MA_5 & MA_10) in the df:
for ma in ma_list:
df_ma[f'MA_{ma}'] = df_ma.mid_c.rolling(window = ma).mean() ----
B. I then create a new column DIFF based on the difference of the 2 moving averages above:
df_ma['DIFF'] = df_ma.MA_5 - df_ma.MA_10----
How do I accomplish step B without manually entering the column name?
I tried the following, I knew it was wrong before I ran the code. How would I accomplish this.
df_ma['DIFF'] = df_ma.[f"MA_{ma_list[0]}"] - df_ma.[f"MA_{ma_list[1]}"]Thank you.
RE: How to refer to dataframe column name based on a list - lorensa74 - May-17-2021
Solved it. Should be like so:
df_ma['DIFF'] = df_ma[f"MA_{ma_list[0]}"] - df_ma[f"MA_{ma_list[1]}"]