functional.py

# Lambda
s=lambda x:x*x
s(2)

# Map

def addition(n): 
    return n + n 
numbers = (1, 2, 3, 4) 
result = map(addition, numbers) 
print(list(result)) 

# Reduce
import functools
def mult(x,y):
    print("x=",x," y=",y)
    return x*y

fact=functools.reduce(mult, range(1, 10))
print(fact)

# Filter
seq = [0, 1, 2, 3, 5, 8, 13] 
result = filter(lambda x: x % 2 != 0, seq) 
print(list(result))