Create an empty data frame with index from another data frame

Question

I've got a data frame df1 with multiple columns and rows. Simple example:

    TIME T1  T2         1 10 100        2 20 200        3 30 300 

I'd like to create an empty data frame df2 and later on, add new columns with the calculation results.

For this moment my code looks like this:

     df1=pd.read_csv("1.txt",index_col="TIME")       df2=df1.copy()[[]] #copy df1 and erase all columns 

...adding two new columns:

     df2["results1"],df2["results2"]=df1["T1"]*df["T2"]*3,df1["T2"]+100 

Is there any better/safer/faster way to do this ? Is it possible to create an empty data frame df2 and only copy index from df1 ?

Answer 1

df2 = pd.DataFrame(index=df1.index) 

This will create a DataFrame with no columns but just an index, and it will be the same index as in the df1.