Python练习(廖雪峰)

map/reduce

>>> def prod(aa):
	def mult(x, y):
		return int(x) * int(y) 		    
	return reduce(mult, aa)

>>> prod([2, '12', 3, 4, 3])
864

 

>>> def norm(aa):
	return aa[0].upper() + aa[1:].lower()

>>> map(norm, ['Jie', 'seiI', 'ddf'])
['Jie', 'Seii', 'Ddf']

filter

>>> def is_sus(s):
	if s == 1 or s == 2:
		return 1
	for i in range(2,s):
		if s%i == 0:
			return 1
	return 0

>>> filter(is_sus, range(1,101))