016_calculating_with_func.py

def zero(f = None): return 0 if not f else f(0)
def one(f = None): return  1 if not f else f(1)
def two(f = None): return 2 if not f else f(2)
def three(f = None): return 3 if not f else f(3)
def four(f = None): return 4 if not f else f(4)
def five(f = None): return 5 if not f else f(5)
def six(f = None): return 6 if not f else f(6)
def seven(f = None): return 7 if not f else f(7)
def eight(f = None): return 8 if not f else f(8)
def nine(f = None): return 9 if not f else f(9)

def plus(y): return lambda x: x+y
def minus(y): return lambda x: x-y
def times(y): return lambda x: x*y
def divided_by(y): return lambda x: x//y

# Requirements:

# There must be a function for each number from 0 ("zero") to 9 ("nine")
# There must be a function for each of the following mathematical operations: plus, minus, times, dividedBy (divided_by in Ruby and Python)
# Each calculation consist of exactly one operation and two numbers
# The most outer function represents the left operand, the most inner function represents the right operand
# Divison should be integer division. For example, this should return 2, not 2.666666...: