bee-san

def power(base, exponent):
  return base ** exponent

bee-san

def rtnBrandon():
    return "brandon"
def rtnJohn():
    return "john"

def rtnPerson():
    age = int(input("What's your age?"))

    if age == 21:
        return rtnBrandon()

bee-san

def summation(nums):
    return sum(nums)

def action(func, numbers):
    return func(numbers)

print(action(summation, [1, 2, 3]))

# Output is 6

bee-san

x = range(-5, 5)
all_less_than_zero = list(filter(lambda num: num < 0, x))

bee-san

x = range(-5, 5)
new_list = []

for num in x:
    if num < 0:
        new_list.append(num)

bee-san

filter(function, list)

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from functools import reduce

product = reduce((lambda x, y: x * y),[1, 2, 3, 4])

bee-san

product = 1
x = [1, 2, 3, 4]
for num in x:
    product = product * num

bee-san

reduce(function, list)

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x = [1, 2, 3, 4, 5]
print(list(map(lambda num: num * num, x)))