sort dataset by column pandas code example

Example 1: sort a dataframe by a column valuepython

>>> df.sort_values(by=['col1'])
    col1 col2 col3
0   A    2    0
1   A    1    1
2   B    9    9
5   C    4    3
4   D    7    2
3   NaN  8    4

Example 2: sort array python by column

Sorting a NumPy array by a column orders its rows based 
on the ordering of the values in the column. 
For example, sorting the array [[8 2 -2] [-4 1 7] [6 3 9]] 
by its second column returns [[-4 1 7] [8 2 -2] [6 3 9]].
USE numpy.args

sorted_array = an_array[numpy.argsort(an_array[:, 1])]

Example 3: sort dataframe by column

df.sort_values(by='col1', ascending=False, na_position='first', inplace=True)