To create column names in a pandas dataframe, you can simply provide a list of column names when you create the dataframe using the pd.DataFrame() constructor. For example, you can create a dataframe with column names 'A', 'B', and 'C' by passing a list of those column names as an argument:
import pandas as pd
data = {'A': [1, 2, 3],
'B': [4, 5, 6],
'C': [7, 8, 9]}
df = pd.