Creating an empty Pandas DataFrame

By: Rajesh P.S.

Creating an empty Pandas DataFrame is a fundamental step in data analysis and manipulation, allowing you to construct a blank tabular structure to store and organize data efficiently. This process involves initializing a DataFrame object without any pre-existing data, offering a clean canvas for populating with relevant information later on.

By initializing an empty DataFrame, data scientists and analysts can effectively prepare their data structures, ensuring a robust foundation for subsequent operations and analysis, thus optimizing the workflow for data exploration and insight discovery.

Create an empty DataFrame :

import pandas as pd import numpy as np df = pd.DataFrame() print(df)

Empty DataFrame Columns: [] Index: []

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Add columns to an empty DataFrame

Adding columns to an empty Pandas DataFrame is a crucial operation that enables data scientists and analysts to define and structure the dataset according to their specific requirements. By using the DataFrame's assign() method or simply assigning values to new column names, users can efficiently create and populate columns with data, effectively customizing the DataFrame's structure to accommodate various variables and information. This flexibility empowers data professionals to seamlessly incorporate new attributes, perform calculations, and enrich the dataset, paving the way for comprehensive data analysis and insightful decision-making.

import pandas as pd import numpy as np df = pd.DataFrame() df['Name'] = ['John', 'Doe', 'Bill'] df['Promoted'] = [True, False,True] df['Marks'] = [82, 38, 63] print(df)

Name Promoted Marks 0 John True 82 1 Doe False 38 2 Bill True 63

Method 2

Initialize empty frame with column names

import pandas as pd import numpy as np col_names = ['Name', 'Promoted', 'Marks'] df = pd.DataFrame(columns = col_names) df

Empty DataFrame Columns: [Name, Promoted, Marks] Index: []

Add a new record to a dataframe

import pandas as pd import numpy as np col_names = ['Name', 'Promoted', 'Marks'] df = pd.DataFrame(columns = col_names) df.loc[len(df)] = ['John', True, 80] df

Name Promoted Marks 0 John True 80

Using Dictionary to add data in a dataframe

import pandas as pd import numpy as np col_names = ['Name', 'Promoted', 'Marks'] df = pd.DataFrame(columns = col_names) my_dic = {'Name':'John', 'Promoted':True, 'Marks':80} df.loc[len(df)] = my_dic df

Name Promoted Marks 0 John True 80

how to Creating an empty Pandas DataFrame

Using append() method to add data

import pandas as pd import numpy as np df = pd.DataFrame() data = pd.DataFrame({"A": range(5)}) df.append(data)

A 0 0 1 1 2 2 3 3 4 4

Create pandas Dataframe by appending one row at a time

In this case, you can use DataFrame.loc[index] , where the row with index will be what you specify it to be in the dataframe.

import pandas as pd from numpy.random import randint df = pd.DataFrame(columns=['Student', 'Mark1', 'Mark2']) for i in range(5): df.loc[i] = ['Student-' + str(i)] + list(randint(10, size=2)) df

Student Mark1 Mark2 0 Student-0 3 7 1 Student-1 4 2 2 Student-2 4 6 3 Student-3 3 0 4 Student-4 1 6

Conclusion

Creating an empty Pandas DataFrame is a fundamental step in data analysis and manipulation tasks using the Pandas library in Python. It provides a blank canvas that can be populated with data, allowing users to structure and organize their dataset based on their specific needs and objectives.

Next > How to Check if a Pandas DataFrame is Empty

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