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Python | Pandas DatetimeIndex.inferred_freq
  • Last Updated : 24 Dec, 2018

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 DatetimeIndex.inferred_freq attribute tries to return a string representing a frequency guess, generated by infer_freq. For those cases in which the function is not able to auto detect the frequency of the DatetimeIndex it returns None.

Syntax: DatetimeIndex.inferred_freq

Return: freq

Example #1: Use DatetimeIndex.inferred_freq attribute to auto detect the frequency of the given DatetimeIndex object.






# importing pandas as pd
import pandas as pd
  
# Create the DatetimeIndex
didx = pd.date_range("2008-12-30", periods = 5, freq ='Q')
  
# Print the DatetimeIndex
print(didx)

Output :

Now we want the function to auto detect the frequency of the given DatetimeIndex object.




# find the frequency of the object.
didx.inferred_freq

Output :

As we can see in the output, the function has tried to auto detect the frequency of the given DatetimeIndex object and has returned a quarter type frequency starting from the month of December.
 
Example #2: Use DatetimeIndex.inferred_freq attribute to auto detect the frequency of the given DatetimeIndex object.




# importing pandas as pd
import pandas as pd
  
# Create the DatetimeIndex
didx = pd.DatetimeIndex(start ='2000-01-31 06:30', freq ='BM'
                           periods = 5, tz ='Asia/Calcutta')
  
# Print the DatetimeIndex
print(didx)

Output :

Now we want the function to auto detect the frequency of the given DatetimeIndex object.




# find the frequency of the object.
didx.inferred_freq

Output :

As we can see in the output, the function has tried to auto detect the frequency of the given DatetimeIndex object and has returned ‘BM’ (Business Month end) frequency.

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