sp = [0, 5, 19, 33, 56, 71, 75]

59

56

random_list = [0, 5, 19, 33, 56, 71, 75]
def number_near(n):
    if n in random_list:
        return n
    random_list.append(n)
    random_list.sort()
    return random_list.pop(random_list.index(n) - 1)
print number_near(59)

a = [0, 5, 19, 33, 56, 71, 75]
def f(n):
	if n<a[0]:
		return "n меньше всех"
	for i in a:
		if n < i:
			return x
		x = i
	else:
		return "n больше всех"
print f(59)

a = [0, 5, 19, 33, 56, 71, 75]
def f(n):
	if n<a[0]:
		return "n меньше всех"
	for i, j in enumerate(a):
		if n < j:
			return a[i-1]
	else:
		return "n больше всех"
print f(59)

from bisect import bisect
sp = [0, 5, 19, 33, 56, 71, 75]
def number_near(num):
    return sp[bisect(sp, num) - 1]
print number_near(59)