1. 寫一個生成式能夠產(chǎn)生的數(shù)據(jù)為: 1, 4, 27, 256, 3125,…, 9**9

nums = (i**i for i in range(1, 5))
for num in nums:
    print(num)

2. 寫一個生成式能夠產(chǎn)生1-10中所有半徑是偶數(shù)的圓的面積

import math
areas = (math.pi *  r ** 2 for r in range(1, 11) if not r & 1)
for area in areas:
    print(area)

3. 寫一個生成式交換字段的鍵和值，產(chǎn)生一個新的字典

dict1 = {'a': 1, 'b': 2}
dict2 = dict((dict1[key], key) for key in dict1)
print(dict2)