# d = {'a': 1, 'b': 2, 'c': 3}

# for item in d.items():

# print(item[0], item[1])

from collections.abc import Iterable

isinstance('abc', Iterable)

y = [x * x for x in range(1, 11)]

print(y)

# d = {'a': 1, 'b': 2, 'c': 3}

# for item in d.items():

# print(item[0], item[1])

#

#

# print(len([]))

def findMinAndMax(L):

if len(L) == 0:

return (None, None)

else:

min = max = L[0]

for i in L:

if i < min:

min = i

if i > max:

max = i

return (min, max)

# 测试

if findMinAndMax([]) != (None, None):

print('测试失败!')

elif findMinAndMax([7]) != (7, 7):

print('测试失败!')

elif findMinAndMax([7, 1]) != (1, 7):

print('测试失败!')

elif findMinAndMax([7, 1, 3, 9, 5]) != (1, 9):

print('测试失败!')

else:

print('测试成功!')