Try

def ceil(n):
    return int(-1 * n // 1 * -1)

def floor(n):
    return int(n // 1)

I used int() to make the values integer. As ceiling and floor are a type of rounding, I thought integer is the appropriate type to return.

The integer division //, goes to the next whole number to the left on the number line. Therefore by using -1, I switch the direction around to get the ceiling, then use another * -1 to return to the original sign. The math is done from left to right.

You can call int() on the float to cast to the lower int (not obviously the floor but more elegant)

int(3.745)  #3

Alternatively call int on the floor result.

from math import floor

f1 = 3.1415
f2 = 3.7415

print floor(f1)       # 3.0
print int(floor(f1))  # 3
print int(f1)         # 3
print int(f2)         # 3 (some people may expect 4 here)
print int(floor(f2))  # 3

http://docs.python.org/library/functions.html#int