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Python - How to Group Pandas DataFrame by Month?
We will group Pandas DataFrame using the groupby. Select the column to be used using the grouper function. We will group month-wise and calculate sum of Registration Price monthly for our example shown below for Car Sale Records.
At first, let’s say the following is our Pandas DataFrame with three columns −
dataFrame = pd.DataFrame(
{
"Car": ["Audi", "Lexus", "Tesla", "Mercedes", "BMW", "Toyota", "Nissan", "Bentley", "Mustang"],
"Date_of_Purchase": [
pd.Timestamp("2021-06-10"),
pd.Timestamp("2021-07-11"),
pd.Timestamp("2021-06-25"),
pd.Timestamp("2021-06-29"),
pd.Timestamp("2021-03-20"),
pd.Timestamp("2021-01-22"),
pd.Timestamp("2021-01-06"),
pd.Timestamp("2021-01-04"),
pd.Timestamp("2021-05-09")
],
"Reg_Price": [1000, 1400, 1100, 900, 1700, 1800, 1300, 1150, 1350]
}
)Use the Grouper to select Date_of_Purchase column within groupby() function. The frequency freq is set ‘M’ to group by month-wise −
print("\nGroup Dataframe by month...\n",dataFrame.groupby(pd.Grouper(key='Date_of_Purchase', axis=0, freq='M')).sum())Example
Following is the code −
import pandas as pd
# dataframe with one of the columns as Date_of_Purchase
dataFrame = pd.DataFrame(
{
"Car": ["Audi", "Lexus", "Tesla", "Mercedes", "BMW", "Toyota", "Nissan", "Bentley", "Mustang"],
"Date_of_Purchase": [
pd.Timestamp("2021-06-10"),
pd.Timestamp("2021-07-11"),
pd.Timestamp("2021-06-25"),
pd.Timestamp("2021-06-29"),
pd.Timestamp("2021-03-20"),
pd.Timestamp("2021-01-22"),
pd.Timestamp("2021-01-06"),
pd.Timestamp("2021-01-04"),
pd.Timestamp("2021-05-09")
],
"Reg_Price": [1000, 1400, 1100, 900, 1700, 1800, 1300, 1150, 1350]
}
)
print"DataFrame...\n",dataFrame
# Grouper to select Date_of_Purchase column within groupby function
print"\nGroup Dataframe by month...\n",dataFrame.groupby(pd.Grouper(key='Date_of_Purchase', axis=0, freq='M')).sum()Output
This will produce the following output. The Registration price of every month gets calculated −
DataFrame... Car Date_of_Purchase Reg_Price 0 Audi 2021-06-10 1000 1 Lexus 2021-07-11 1400 2 Tesla 2021-06-25 1100 3 Mercedes 2021-06-29 900 4 BMW 2021-03-20 1700 5 Toyota 2021-01-22 1800 6 Nissan 2021-01-06 1300 7 Bentley 2021-01-04 1150 8 Mustang 2021-05-09 1350 Group Dataframe by month... Reg_Price Date_of_Purchase 2021-01-31 4250.0 2021-02-28 NaN 2021-03-31 1700.0 2021-04-30 NaN 2021-05-31 1350.0 2021-06-30 3000.0 2021-07-31 1400.0
Updated on: 09-Sep-2021
1K+ Views
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