Codewars. Python

human-readable-duration-format-4kyu.py

def format_duration(start_number):
    print(start_number)
    _seconds = start_number % 60
    _minutes = start_number // 60 % 60
    _hours = start_number % (3600*24) // 3600 
    _days = start_number % (3600*24*365) // (3600*24)
    _years = start_number // (3600*24*365)
    
    mass_of_results = []
    
    counter = 1
    
    checker_singular = {5:" second, ", 4:" minute, ", 3:" hour, ", 2:" day, ", 1:" year, "}
    checker_plural = {5:" seconds, ", 4:" minutes, ", 3:" hours, ", 2:" days, ", 1:" years, "}
    
    result = ""
    
    if start_number == 0:
        return "now"
    for i in(_years,_days,_hours,_minutes,_seconds):
        if i == 1:
            result += f"{i}{checker_singular.get(counter)}"
        elif i > 1:
            result += f"{i}{checker_plural.get(counter)}"
        counter += 1
    
    result = result.split()
    
    if len(result) > 2: 
        result[len(result)-1] = result[len(result)-1][:len(result[len(result)-1])-1:]
        result[len(result)-3] = result[len(result)-3].replace(","," and")
    else:
        result[len(result)-1] = result[len(result)-1][:len(result[len(result)-1])-1:]
    for i in range(len(result)):
        if i != len(result)-1:
            result[i] += " "
    
    return "".join(result)