python 进阶

今天看到一个用法很好,把页面上的cookies 转成dict

cookies = dict(line.split('=') for line in cookie.strip().split(';'))

 

def generator_function():
	for i in range(10):
		yield i

if __name__ == '__main__':
	for item in generator_function():
		print item
	gen = generator_function()
	print next(gen)
	print next(gen)
	print next(gen)
	print next(gen)
	l = iter(range(5))
	print next(l)
	my_name = 'Zsl'
	my_iter = iter(my_name)
	print type(my_iter)
	print type(next(my_iter))

　　生成器可以提升性能

#coding:utf8
'''@map,的用法理解'''

items = range(5)
squared = []
for i in items:
    squared.append(i**3)
print squared

#对比-------------

squared2 = map(lambda x: x**3,items)
print squared2

def multiply(x):
    return x*x

def add(x):
    return x+x


funcs = [multiply,add]
for i in items:
    value = map(lambda x: x(i),funcs)#x代表funcs中的对象(它的对象是两个函数),i是x的参数
    print value