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Split Pandas Dataframe by Rows

  • Difficulty Level : Medium
  • Last Updated : 29 Aug, 2020

We can try different approaches for splitting Dataframe to get the desired results. Let’s take an example of a dataset of diamonds.

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# importing libraries
import seaborn as sns
import pandas as pd
import numpy as np
  
# data needs not to be downloaded separately
df  = sns.load_dataset('diamonds')
df.head()

Output:

Method 1: Splitting Pandas Dataframe by row index



In the below code, the dataframe is divided into two parts, first 1000 rows, and remaining rows. We can see the shape of the newly formed dataframes as the output of the given code.




# splitting dataframe by row index
df_1 = df.iloc[:1000,:]
df_2 = df.iloc[1001:,:]
print("Shape of new dataframes - {} , {}".format(df_1.shape, df_2.shape))

Output:

Method 2: Splitting Pandas Dataframe by groups formed from unique column values

Here, we will first grouped the data by column value “color”. The newly formed dataframe consists of grouped data with color = “E”.




# splitting dataframe by groups
# grouping by particular dataframe column
grouped = df.groupby(df.color)
df_new = grouped.get_group("E")
df_new

Output:

Method 3 : Splitting Pandas Dataframe in predetermined sized chunks

In the above code, we can see that we have formed a new dataset of a size of 0.6 i.e. 60% of total rows (or length of the dataset), which now consists of 32364 rows. These rows are selected randomly.




# splitting dataframe in a particular size
df_split = df.sample(frac=0.6,random_state=200)
df_split.reset_index()

Output:




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