Pandas merge two datasets with same number of rows

I want to add that pd.concat can do what you want by just providing the axis as columns. like this:

pd.concat([T1,T2],axis=1)

You need reset_index() before concat for default indices:

df = pd.concat([T1.reset_index(drop=True),T2.reset_index(drop=Tru‌​e)], axis=1)