Discussion on: Daily Challenge #21 - Human Readable Time

DIVS = [86400 * 365, 86400, 3600, 60]


def eval_time(a, b, c):
    if a >= DIVS[b]:
        c.append(a // DIVS[b])
    else:
        c.append(0)
    remain = a % DIVS[b]
    if (remain > 0) and (b < 3):
        eval_time(remain, b + 1, c)
    else:
        c.append(remain)

def pretty_output(a):
    names = [" year", " day", " hour", " minute", " second"]
    r = ""
    for i in range(0, len(a)):
        if a[i] >= 1:
            r += str(a[i]) + names[i]
            if a[i] > 1:
                r += "s"
            r += ", "
    r = r.strip(", ")
    s_items = r.rsplit(",")
    if len(s_items) > 1:
        print(",".join(s_items[:-1]) + " and" + s_items[-1])
    elif s_items[0] == "":
        print("now")
    else:
        print(r)

def format_duration(n):
    time_vals = []
    eval_time(n, 0, time_vals)
    pretty_output(time_vals)


format_duration(62)
format_duration(3662)
format_duration(66711841)
format_duration(31539601)
format_duration(120)
format_duration(0) 

1 minute and 2 seconds
1 hour, 1 minute and 2 seconds
2 years, 42 days, 3 hours, 4 minutes and 1 second
1 year, 1 hour and 1 second
2 minutes
now