In [19]:

    

# https://www.codewars.com/kata/write-number-in-expanded-form/train/python

import functools # needed for code wars apparently
def expanded_form(num):
    str_form = str(num)[::-1]
    valArr = []
    for i in range(0, len(str_form)):
        if str_form[i] == "0": continue
        
        valArr.insert(0, str_form[i] + ("0" * i))
        
        # this also works
#     return functools.reduce(lambda x,y: x + " + " + y, valArr)
    return ' + '.join(valArr)


    

In [21]:

    

expanded_form(10072)


    

    
Out[21]:





'10000 + 70 + 2'

In [18]:

    

# this was the top answer
def expanded_form_CodeWars(n):
    result = []
    for a in range(len(str(n)) - 1, -1, -1):
        current = 10 ** a
        quo, n = divmod(n, current)
        if quo:
            result.append(str(quo * current))
    return ' + '.join(result)


    

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