How to Add Dictionary Keys and Values as Pandas Columns?

As a Data Scientise programmer, you have to work most on the Python Dictionary and lists. You use it with Pandas for creating a beautiful and exporting table for your data present as a list and the dictionary. But converting dictionary keys and values as Pandas columns always leads to time consuming if you don’t know the concept of using it. In this entire tutorial of “how to “, you will learn how to convert python dictionary to pandas dataframe in simple steps.

Step 1: Import the necessary libraries

Here I will use only the pandas library for creating dataframe.

import pandas as pd

Step 2: Create a List of Dictionary items

Before converting a dictionary into the data frame lets creates a sample dictionary. Let’s say there are two keys to it that is the name of the country and its capital.  I will make a list of all the dictionary that represents the keys and value field in each dictionary.

country_list = [] 
country_list.append({"Country":"India","Capital":"New Delhi"})
country_list.append({"Country":"USA","Capital":"Washington, D.C."})

Step 3: Create a Dataframe

Now when you get the list of dictionary then You will use the pandas function DataFrame() to modify it into dataframe. Use the following code.

df = pd.DataFrame(country_list)

It will create the Dataframe table with Country and Capital keys as Columns and its values as a row. In our example, there are Four countries and Four capital.

dataframe for country and its capital

Other Cases

There are also some other cases when you are unable to get proper results. For example, I have a dictionary of dictionary inside the list. Then how you can convert into DataFrame. Let’s Understand it.

Suppose I have list stock signals in the format like this.

signal =[{'pattern': {'signal': 'Bear', 'date': '2020-01-11'}, 'code': 532648, 'company_name': 'YESBANK'},
{'pattern': {'signal': 'Bull', 'date': '2020-01-11'}, 'code': 532839, 'company_name': 'DISHTV'}, 
{'pattern': {'signal': 'Bear', 'date': '2020-01-11'}, 'code': 533122, 'company_name': 'RTNPOWER'},
{'pattern': {'signal': 'Bull', 'date': '2020-01-11'}, 'code': 539310, 'company_name': 'TISL'}, 
{'pattern': {'signal': 'Bull', 'date': '2020-01-11'}, 'code': 514183, 'company_name': 'BLACKROSE'} ]

It is the list of all the buying and selling signals for a particular stock. The above list has a dictionary of dictionary with the name as the pattern as the key. It contains signal and date as the key-value pair.  The question is how can you create a data frame with the column name as signal, date, code and company name. Here is the code.

rows = []
df1 = df["pattern"] # df is the dataframe for the above signal
for row,code,name in zip(df1,df["code"],df["company_name"]):
    row["code"] = code
    row["name"] = name
df2 = pd.DataFrame(rows)

In the code above you can see first, I am extracting all dictionary items and iterating it with code and name of the company stocks. After that, I am appending all the changes in the rows list. Then you can easily convert this list into DataFrames using pd.DataFrame() function. You will see the below output like this.

showing pattern code and company name

That’s all for now. I hope you have learned to Add Dictionary Keys and Values as Pandas Columns. If you have a query regarding this please contact us for more support.


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