Python Forum

I am new to Python. I got the error message in the title which is meaningless to me when my program got to the following line:

dfTemp = pd.concat([tenderers, newTenderer], axis=1) 

I am trying to join two dataframes on the vertical axis. Could someone either tell me what I am doing wrong or if there is another way of achieving my goal, please?

What data frames are defined under tenderers and newTenderer ? tenderers.info()?
To do vertical concatenation you need to pass axis=0 instead:

# short example
import pandas as pd
x = pd.DataFrame(pd.np.random.rand(10,10))
pd.concat([x, x], axis=0)

scidam,
Thank you very much! That seems to have fixed my problem. I can now move on to my next one.