Pretty print a `datatime` time delta object in Python in days, hours, minutes, seconds, and milliseconds

python_pretty_timedelta.py

def pretty_timedelta(delta):
    """
    Pretty printing a `timedelta` object form `datetime` Python module

        
    Acknowledgements: 
    @thatalextaylor for his earlier version:
    https://gist.github.com/thatalextaylor/7408395
    That I used to modify the script.

    Args:
        delta -- `datatime` Python time delta object

    Returns:
        None -- just a printing function -- works better with Jupyter Notebook
    """
    timedelta_seconds = delta.total_seconds()
    
    # Seconds will be int-s, timedelta_seconds stores also decimal places
    seconds = timedelta_seconds
    
    # Can be negative
    sign_string = '-' if seconds < 0 else ''
    
    seconds = abs(int(seconds))
 
    days, seconds = divmod(seconds, 86400)
    hours, seconds = divmod(seconds, 3600)
    minutes, seconds = divmod(seconds, 60)
    # Skipping seconds, as the next divmod is 1, so the
    # seconds stay the same.
    _, seconds_decimal = divmod(timedelta_seconds, 1)
    milliseconds = '%.2f' % float(seconds_decimal*1000)
    print('__________________________________')
    print('Calculating the results has taken:')
    if days > 0:
        print(' %s %dd %dh %dm %ds' % (sign_string, days, hours, minutes, seconds))
    elif hours > 0:
        print(' %s %dh %dm %ds' % (sign_string, hours, minutes, seconds))
    elif minutes > 0:
        print(' %s %dm %ds' % (sign_string, minutes, seconds))
    elif seconds > 0:
        print(' %s %ds %sms' % (sign_string, seconds, milliseconds))
    elif milliseconds > 0:
        print(' %s %ds' % (sign_string, milliseconds))

python_pretty_timedelta_test.py

import time

from datetime import datetime

# We need to know when the cell/calculation started execution
start_time = datetime.now()

datetime_display_format = "%Y-%m-%d %H:%M:%S"

'''
Your code goes here
'''
# Here we use a small pause to showcase the results
time.sleep(2.5)

# When the cell finished executing
end_time = datetime.now()

print('Calculation started at:  ', start_time.strftime(datetime_display_format))

print('Calculation ended at:    ', end_time.strftime(datetime_display_format))

# Difference between two timestamps
# in hours:minutes:seconds format
delta = end_time - start_time

# Output: pretty print the result
pretty_timedelta(delta)

Example outputs:

• for 2.5 seconds:

Calculation started at:   2023-11-06 09:32:33
Calculation ended at:     2023-11-06 09:32:35
__________________________________
Calculating the results has taken:
  2s 502.75ms

• for 95 seconds:

Calculation started at:   2023-11-06 10:05:33
Calculation ended at:     2023-11-06 10:07:08
__________________________________
Calculating the results has taken:
  1m 35s