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Python Pandas - How to append rows to a DataFrame
To append rows to a DataFrame, use the append() method. Here, we will create two DataFrames and append one after the another.
At first, import the pandas library with an alias −
import pandas as pd
Now, create the 1st DataFrame
dataFrame1 = pd.DataFrame( { "Car": ['BMW', 'Lexus', 'Audi', 'Jaguar'] } )
Create the 2nd DataFrame
dataFrame2 = pd.DataFrame( { "Car": ['Mercedes', 'Tesla', 'Bentley', 'Mustang'] } )
Next, append rows to the end
dataFrame1 = dataFrame1.append(dataFrame2)
Example
Following is the code
import pandas as pd # Create DataFrame1 dataFrame1 = pd.DataFrame( { "Car": ['BMW', 'Lexus', 'Audi', 'Jaguar'] } ) print"DataFrame1 ...\n",dataFrame1 # Find length of DataFrame1 print"DataFrame1 length = ", len(dataFrame1) # Create DataFrame2 dataFrame2 = pd.DataFrame( { "Car": ['Mercedes', 'Tesla', 'Bentley', 'Mustang'] } ) print"\nDataFrame2 ...\n",dataFrame2 # Find length of DataFrame2 print"DataFrame2 length = ", len(dataFrame2) # append DataFrames dataFrame1 = dataFrame1.append(dataFrame2) print"\nAppending dataframes...\n", dataFrame1
Output
This will produce the following output
DataFrame1 ... Car 0 BMW 1 Lexus 2 Audi 3 Jaguar DataFrame1 length = 4 DataFrame2 ... Car 0 Mercedes 1 Tesla 2 Bentley 3 Mustang DataFrame2 length = 4 Appending dataframes... Car 0 BMW 1 Lexus 2 Audi 3 Jaguar 0 Mercedes 1 Tesla 2 Bentley 3 Mustang
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