# 元组/字典/集合示例

from random import randint

##from math import sin, cos
##
##for x in 3.44, 5.12, 6.77, 8.05, 4.332:
##    print(x)
##
##print("---call functions---")
##
##def square(x):
##    return x * x
##
##for x in square(3.44), sin(5.12), cos(6.77), square(8.05):
##    print(x)

# 建立字典

##dic1 = {randint(0, 20) : n for n in range(20)}
##
##print(dic1) # 关键码唯一，有些关键码被重复赋值

# 建立集合

set1 = {n ** 2 for n in range(-20, 20)}

print(set1) # 集合元素唯一

fset = frozenset(n ** 2 for n in range(-20, 20))

print(fset) # 注意 frozenset 的输出形式

# 生成式和作用域

##def func(n):
##    list1 = [x * n for x in range(n)]
##    list2 = [n ** 2 for n in range(10)]
##    print(list1)
##    print(list2)
##    print(n)