python how to rename columns in pandas dataframe

1df = df.rename(columns={"old_col1": "new_col1", "old_col2": "new_col2"})
2

1# Basic syntax:
2# Assign column names to a Pandas dataframe:
3pandas_dataframe.columns = ['list', 'of', 'column', 'names']
4# Note, the list of column names must equal the number of columns in the
5# 	dataframe and order matters
6
7# Rename specific column names of a Pandas dataframe:
8pandas_dataframe.rename(columns={'column_name_to_change':'new_name'})
9# Note, with this approach, you can specify just the names you want to
10# 	change and the order doesn't matter
11
12# For rows, use "index". E.g.:
13pandas_dataframe.index = ['list', 'of', 'row', 'names']
14pandas_dataframe.rename(index={'row_name_to_change':'new_name'})

1df_new = df.rename(columns={'A': 'a'}, index={'ONE': 'one'})
2print(df_new)
3#         a   B   C
4# one    11  12  13
5# TWO    21  22  23
6# THREE  31  32  33
7
8print(df)
9#         A   B   C
10# ONE    11  12  13
11# TWO    21  22  23
12# THREE  31  32  33
13