pandas Rename a column


Example

df = pd.DataFrame({'old_name_1': [1, 2, 3], 'old_name_2': [5, 6, 7]})

print(df)
# Output: 
#    old_name_1  old_name_2
# 0           1           5
# 1           2           6
# 2           3           7

To rename one or more columns, pass the old names and new names as a dictionary:

df.rename(columns={'old_name_1': 'new_name_1', 'old_name_2': 'new_name_2'}, inplace=True)
print(df)
# Output:
#   new_name_1  new_name_2
# 0           1           5
# 1           2           6
# 2           3           7

Or a function:

df.rename(columns=lambda x: x.replace('old_', '_new'), inplace=True)
print(df)
# Output:
#   new_name_1  new_name_2
# 0           1           5
# 1           2           6
# 2           3           7

You can also set df.columns as the list of the new names:

df.columns = ['new_name_1','new_name_2']
print(df)
# Output:
#   new_name_1  new_name_2
# 0           1           5
# 1           2           6
# 2           3           7

More details can be found here.