create a function to accumulate values based on dates in python

You can create a function to accumulate values based on dates in Python in the following way:

main.py
from datetime import date, timedelta

def accumulate_by_date(data):
    """
    This function accumulates the values in the input data dictionary by date
    and returns the accumulated dictionary.
    
    Parameters:
        data (dict): A dictionary with dates as keys and values as values
        
    Returns:
        dict: A dictionary with accumulated values by date
    """
    accumulated_data = {}
    total = 0
    for d in sorted(data):
        total += data[d]
        accumulated_data[d] = total
    return accumulated_data
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Here, we import the date and timedelta modules from the datetime package.

The accumulate_by_date function takes a dictionary data as input where the keys represent dates and the values represent some numerical values to be accumulated.

The function iterates through the dictionary, adding up values for each date in sorted order by date. We create a new dictionary accumulated_data to store accumulated values for each date.

Finally, the function returns the accumulated_data dictionary with keys representing dates and values representing the accumulated values for that date.