003-005. Lambda @ Lambda makes method one sentence @ lambda parameters: method expression @ def hap(x, y): return x + y hap(10, 20) # 30 (lambda x,y: x + y)(10, 20) # 30 @ map(method, list) # python2 # [0,1,2,3,4] map(lambda x: x ** 2, range(5)) # [0, 1, 4, 9, 16] # python2, 3 # [0,1,2,3,4] list(map(lambda x: x ** 2, range(5))) # [0, 1, 4, 9, 16] @ # reduce(method, ordered type data) # ordered type data is string, list, tuple # reduce() applies elements of ordered type data accumulatively # You should use following code in python 3 from functools import reduce reduce(lambda x, y: x + y, [0, 1, 2, 3, 4]) # 10 reduce(lambda x, y: y + x, 'abcde') # 'edcba' @ filter(method, list) # python2 filter(lambda x: x < 5, range(10)) # [0, 1, 2, 3, 4] # python2,3 list(filter(lambda x: x < 5, range(10))) # [0, 1, 2, 3, 4] filter(lambda x: x % 2, range(10)) # [1, 3, 5, 7, 9] list(filter(lambda x: x % 2, range(10))) # 파이썬 2 및 파이썬 3 # [1, 3, 5, 7, 9]