Dealing with Rows and Columns in Pandas DataFrame

A Data frame is a two-dimensional data structure, i.e., data is aligned in a tabular fashion in rows and columns. We can perform basic operations on rows/columns like selecting, deleting, adding, and renaming. In this article, we are using nba.csv file.

Dealing with Columns

In order to deal with columns, we perform basic operations on columns like selecting, deleting, adding and renaming.

Column Selection

:

In Order to select a column in Pandas DataFrame, we can either access the columns by calling them by their columns name.

Output:

For more examples refer to How to select multiple columns in a pandas dataframeColumn Addition: In Order to add a column in Pandas DataFrame, we can declare a new list as a column and add to a existing Dataframe.

# Import pandas package 
import pandas as pd

# Define a dictionary containing Students data
data = {'Name': ['Jai', 'Princi', 'Gaurav', 'Anuj'],
        'Height': [5.1, 6.2, 5.1, 5.2],
        'Qualification': ['Msc', 'MA', 'Msc', 'Msc']}

# Convert the dictionary into DataFrame
df = pd.DataFrame(data)

# Declare a list that is to be converted into a column
address = ['Delhi', 'Bangalore', 'Chennai', 'Patna']

# Using 'Address' as the column name
# and equating it to the list
df['Address'] = address

# Observe the result
print(df)

Output:

For more examples refer to Adding new column to existing DataFrame in PandasColumn Deletion: In Order to delete a column in Pandas DataFrame, we can use the

drop() method. Columns is deleted by dropping columns with column names.

Output:

As shown in the output images, the new output doesn’t have the passed columns. Those values were dropped since axis was set equal to 1 and the changes were made in the original data frame since inplace was True.

Data Frame before Dropping Columns-

Data Frame after Dropping Columns-

For more examples refer to Delete columns from DataFrame using Pandas.drop()

Dealing with Rows:

In order to deal with rows, we can perform basic operations on rows like selecting, deleting, adding and renaming.

Row Selection

:

Pandas provide a unique method to retrieve rows from a Data frame.

DataFrame.loc[]

method is used to retrieve rows from Pandas DataFrame. Rows can also be selected by passing integer location to an

iloc[]

function.