23_lambda.py

def double(x):
    return x*2
print(double(9))

# lambda
doubled = lambda num : num * 2
print(double(8))

squared = lambda num : num * num
print(squared(8))

add = lambda x, y : x + y
sum = add(2,3)
print(sum)


numbers = [4,5,6,7,8,9,4,5,6,10]
doubled_numbers = map(lambda num : num * 2 , numbers)
print(doubled_numbers)        # <map object at 0x000001FE2C4CB340>
print(list(doubled_numbers))  # [8, 10, 12, 14, 16, 18, 8, 10, 12, 20]


actors = [
    {'name' : 'hardy' , 'age' : 20 },
    {'name' : 'iron man' , 'age' : 62},
    {'name' : 'natasha' , 'age' : 56 },
    {'name' : 'nolan' , 'age' : 34 },
    {'name' : 'thor' , 'age' : 45 },
]

juniors = filter(lambda actor : actor['age'] < 40 , actors)
print(list(juniors)) # [{'name': 'hardy', 'age': 20}, {'name': 'nolan', 'age': 34}]