add column to dataframe at position code example

Example 1: insert column at specific position in pandas dataframe

idx = 0
new_col = [7, 8, 9]  # can be a list, a Series, an array or a scalar   
df.insert(loc=idx, column='Col_name', value=new_col)

Example 2: add column to start of dataframe pandas

df.insert(loc, column, value)