At times, you may need to convert a list to Pandas DataFrame in Python.
You may then use this template to convert your list to a DataFrame:
import pandas as pd list_name = ['item_1', 'item_2', 'item_3',...] df = pd.DataFrame [list_name, columns = ['column_name']]
In the next section, you’ll see how to perform the conversion in practice.
Examples of Converting a List to Pandas DataFrame
Example 1: Convert a List
Let’s say that you have the following list that contains 5 products:
products_list = ['laptop', 'printer', 'tablet', 'desk', 'chair']
You can then apply the following syntax in order to convert the list of products to Pandas DataFrame:
import pandas as pd products_list = ['laptop', 'printer', 'tablet', 'desk', 'chair'] df = pd.DataFrame [products_list, columns = ['product_name']] print [df]
This is the DataFrame that you’ll get:
product_name
0 laptop
1 printer
2 tablet
3 desk
4 chair
Example 2: Convert a List of Lists
How would you then convert a list of lists to a DataFrame?
For instance, let’s say that you have the following list of lists:
products_list = [['laptop',1300],['printer',150],['tablet',300],['desk',450],['chair',200]]
You can then run the code below to perform the conversion to a DataFrame:
import pandas as pd products_list = [['laptop',1300],['printer',150],['tablet',300],['desk',450],['chair',200]] df = pd.DataFrame [products_list, columns = ['product_name', 'price']] print [df]
And this is the result that you’ll get:
product_name price
0 laptop 1300
1 printer 150
2 tablet 300
3 desk 450
4 chair 200
Alternatively, you may have your list of lists as follows:
products_list = [['laptop', 'printer', 'tablet', 'desk', 'chair'],[1300, 150, 300, 450, 200]]
Therefore, the Python code to perform the conversion to a DataFrame would be:
import pandas as pd products_list = [['laptop', 'printer', 'tablet', 'desk', 'chair'],[1300, 150, 300, 450, 200]] df = pd.DataFrame [products_list].transpose[] df.columns = ['product_name', 'price'] print [df]
Run the code, and you’ll get the same DataFrame:
product_name price
0 laptop 1300
1 printer 150
2 tablet 300
3 desk 450
4 chair 200
Check the Object Type
If needed, you may also check the type of the objects [e.g., List vs. DataFrame] by applying this code:
import pandas as pd products_list = [['laptop', 'printer', 'tablet', 'desk', 'chair'],[1300, 150, 300, 450, 200]] df = pd.DataFrame [products_list].transpose[] df.columns = ['product_name', 'price'] print ['products_list: ' + str[type[products_list]]] print ['df: ' + str[type[df]]]
And here is the result:
products_list:
df:
Applying Stats Using Pandas [optional]
Once you converted your list into a DataFrame, you’ll be able to perform an assortment of operations and calculations using Pandas.
For instance, you may use Pandas to derive some statistics about your data.
In the context of our example, you can apply the code below in order to get the mean, max and min price using Pandas:
import pandas as pd products_list = [['laptop', 'printer', 'tablet', 'desk', 'chair'],[1300, 150, 300, 450, 200]] df = pd.DataFrame [products_list].transpose[] df.columns = ['product_name', 'price'] mean_value = df['price'].mean[] max_value = df['price'].max[] min_value = df['price'].min[] print ['The mean price is: ' + str[mean_value]] print ['The max price is: ' + str[max_value]] print ['The min price is: ' + str[min_value]]
Run the Python code, and you’ll get these stats:
The mean price is: 480
The max price is: 1300
The min price is: 150
An Opposite Scenario
Sometimes, you may face an opposite situation, where you’ll need to convert a DataFrame to a list. If that’s the case, you may want to check the following guide that explains the steps to perform the conversion.
You can directly call the pd.DataFrame[] method and pass your list as the parameter.
import pandas as pd
l = ['Thanks You','Its fine no problem','Are you sure']
pd.DataFrame[l]
Output:
0
0 Thanks You
1 Its fine no problem
2 Are you sure
And if you have multiple lists and you want to make a dataframe out of it. You can do it as following:
import pandas as pd
names =["A","B","C","D"]
salary =[50000,90000,41000,62000]
age = [24,24,23,25]
data = pd.DataFrame[[names,salary,age]] #Each list would be added as a row
data = data.transpose[] #To Transpose and make each rows as columns
data.columns=['Names','Salary','Age'] #Rename the columns
data.head[]
Output:
Names Salary Age
0 A 50000 24
1 B 90000 24
2 C 41000 23
3 D 62000 25