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Python | Pandas Series.is_monotonic_decreasing

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Python is a great language for doing data analysis, primarily because of the fantastic ecosystem of data-centric python packages. Pandas is one of those packages and makes importing and analyzing data much easier.

Pandas series is a One-dimensional ndarray with axis labels. The labels need not be unique but must be a hashable type. The object supports both integer- and label-based indexing and provides a host of methods for performing operations involving the index.

Pandas Series.is_monotonic_decreasing attribute return a boolean value. It returns True if the data in the given Series object is monotonically decreasing else it return False.

Syntax:Series.is_monotonic_decreasing

Parameter : None

Returns : boolean

Example #1: Use Series.is_monotonic_decreasing attribute to check if the underlying data in the given Series object is monotonically decreasing or not.




# importing pandas as pd
import pandas as pd
  
# Creating the Series
sr = pd.Series(['New York', 'Chicago', 'Toronto', 'Lisbon'])
  
# Creating the row axis labels
sr.index = ['City 1', 'City 2', 'City 3', 'City 4'
  
# Print the series
print(sr)


Output :

Now we will use Series.is_monotonic_decreasing attribute to check if the underlying data in the given Series object is monotonically decreasing or not.




# check if monotonically decreasing
sr.is_monotonic_decreasing


Output :


As we can see in the output, the Series.is_monotonic_decreasing attribute has returned False indicating the underlying in the given series object is not monotonically decreasing.
 
Example #2 : Use Series.is_monotonic_decreasing attribute to check if the underlying data in the given Series object is monotonically decreasing or not.




# importing pandas as pd
import pandas as pd
  
# Creating the Series
sr = pd.Series(['4/1/2018', '3/1/2018', '2/1/2018', '1/1/2018'])
  
# Creating the row axis labels
sr.index = ['Day 1', 'Day 2', 'Day 3', 'Day 4']
  
# Print the series
print(sr)


Output :

Now we will use Series.is_monotonic_decreasing attribute to check if the underlying data in the given Series object is monotonically decreasing or not.




# check if monotonically decreasing
sr.is_monotonic_decreasing


Output :

As we can see in the output, the Series.is_monotonic_decreasing attribute has returned True indicating the underlying in the given series object is monotonically decreasing.



Last Updated : 28 Jan, 2019
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