Pandas.cut() method in Python

Pandas cut() function is used to separate the array elements into different bins . The cut function is mainly used to perform statistical analysis on scalar data.  

Syntax: cut(x, bins, right=True, labels=None, retbins=False, precision=3, include_lowest=False, duplicates=”raise”,)

Parameters:

x: The input array to be binned. Must be 1-dimensional.

bins: defines the bin edges for the segmentation.

right : (bool, default True )  Indicates whether bins includes the rightmost edge or not. If right == True (the default), then the bins [1, 2, 3, 4] indicate (1,2], (2,3], (3,4]. 

labels : (array or bool, optional)  Specifies the labels for the returned bins. Must be the same length as the resulting bins. If False, returns only integer indicators of the bins. 

retbins : (bool, default False) Whether to return the bins or not. Useful when bins is provided as a scalar.

Example 1: Let’s say we have an array of 10 random numbers from 1 to 100 and we wish to separate data into 5 bins of (1,20] , (20,40] , (40,60] ,  (60,80] , (80,100] .

Python3

import pandas as pd
import numpy as np


df= pd.DataFrame({'number': np.random.randint(1, 100, 10)})
df['bins'] = pd.cut(x=df['number'], bins=[1, 20, 40, 60,
                                          80, 100])
print(df)

# We can check the frequency of each bin
print(df['bins'].unique())

Output:

Example 2: We can also add labels to our bins, for example let’s look at the previous example and  add some labels to it

Python3

import pandas as pd
import numpy as np

df = pd.DataFrame({'number': np.random.randint(1, 100, 10)})
df['bins'] = pd.cut(x=df['number'], bins=[1, 20, 40, 60, 80, 100],
                    labels=['1 to 20', '21 to 40', '41 to 60',
                            '61 to 80', '81 to 100'])

print(df)

# We can check the frequency of each bin
print(df['bins'].unique())

Output: