python-生成器进阶~生成器表达式

Posted 2020-10-14 dwenwen

列表推导式
y = [1,2,3,4,5,6,7,8]
x = [1,4,9,16,25,36,49,64]
# 方法一：
x = []
for i in y:
    x .append(i*i)
print(x)
# 方法二
x = [i*i for i in y]
print(x)

li= [i/2 for i in range(100)]
print(li)

x = [i*i for i in y]
print(x)

生成器表达式

例题

y = [1,2,3,4,5,6,7,8]
g = (i*i for i in y)    #列表可以使用推导式，生成器也可以使用表达式
print(g)
print(list(g))        #使用list把生成器强转成为列表
for i in g:
    print(i)

laomuji=(‘鸡蛋%s‘ %i for i in range(10))
print(laomuji)
print(next(laomuji))
print(laomuji.__next__())

g = (i*i for i in range(30) if i % 3 is 0)
for i in g:
    print(i)


print([i for i in range(30) if i%3 == 0])
print([i*i for i in range(30) if i%3 == 0])