from random import randint
#建一个字典
data = {x: randint(60,100) for x in 'xyzabc'} #字典推导式
print(data)
#
sorted(data)

#用列表生成式建立一个10到-10之间随机列表
from random import randint
data = [randint(-10,10) for i in range(10)]
print(data)

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#方法一：for 循环
c = []
for i in data:
    if i > 0:
        c.append(i)
print(c)

#方法二：列表解析
d = [i for i in data if i > 0]
print(d)

#方法三：filter 函数
f = filter(lambda x:x > 0,data)
print(list(f))

#用字典生成式建立一个20人的字典
from random import randint
p = {i:randint(60,100) for i in range(1,21)}
print(p)
p ={1: 88, 2: 80, 3: 76, 4: 92, 5: 88, 6: 93, 7: 91, 8: 100, 9: 60, 10: 68, 11: 85, 12: 95, 13: 73, 14: 77, 15: 65, 16: 82, 17: 67, 18: 87, 19: 89, 20: 92}
#筛出字典中值高于90的项

#方法一：for 循环
h = {}
for k,v in p.items():
    if v > 90:
        h[k] = p[k]
print(h)

#方法二：字典解析

g = {k:v for k,v in p.items() if v>90}
print(g)

#用列表生成式建立一个10个数的集合
s = set([randint(-10,10) for x in range(10)])
print(s)

#筛出集合中能被3整除的元素

#方法一：for 循环
n = set()#创建空集合
for i in s:
    if i%3 == 0:
       n.add(i)
print(n)

#方法二：列表解析
w = set([i for i in s if i%3 == 0])
w1 = {i for i in s if i%3 == 0}#和字典解析的区别在于前面没有冒号
print(w)
print(w1)

print(2**38)

name = "lzl"
def f1():
    name = "Eric"
    def f2():
        name = "Snor"
        print(name)
    f2()
f1()