Column-wise filtration  

In this subsection, we will learnhow to filter column-wise data. We can filter columns using the filter() method. The slicing []. filter() method selects the columns when they're passed as a list of columns. Take a look at the following example:

# Filter columns
data.filter(['name', 'department'])

This results in the following output:

Similarly, we can also filter columns using slicing. In slicing, a single column does not need a list, but when we are filtering multiple columns, then they should be on the list. The output of a single column is a pandas Series. If we want the output as a DataFrame, then we need to put the name of the single column into a list. Take a look at the following example:

# Filter column "name"
data['name']

0       Allen Smith
1           S Kumar
2       Jack Morgan
3         Ying Chin
4     Dheeraj Patel
5     Satyam Sharma
6      James Authur
7        Josh Wills
8          Leo Duck
Name...