add a row at top in pandas dataframe [duplicate]

Answer 1

Use pandas.concat and reindex new dataframe:

import pandas as pd
df = pd.DataFrame({'name': ['jon','sam','jane','bob'],
           'age': [30,25,18,26],
           'sex':['male','male','female','male']})
# new line
line = pd.DataFrame({'name': 'dean', 'age': 45, 'sex': 'male'}, index=[0])
# concatenate two dataframe
df2 = pd.concat([line,df.ix[:]]).reset_index(drop=True)
print (df2)

Output:

   age  name     sex
0   45  dean    male
1   30   jon    male
2   25   sam    male
3   18  jane  female
4   26   bob    male