a = ['星期一', '星期三', '星期二', '星期日']

c = {'星期一': 1, '星期二': 2, '星期三': 3, '星期四': 4, '星期五': 5, '星期六': 6, '星期日': 7}

b = {}

for i in a:

    b[i] = c[i]

b = sorted(b.items(), key=lambda t: t[1])

# b = sorted(zip(b.values(), b.keys()))

# 使用zip下面改为j[1]

a = []

for j in b:

    day = j[0]

    a.append(day)

print(a)

def compare_day(day1, day2):

    c = {'星期一': 1, '星期二': 2, '星期三': 3, '星期四': 4, '星期五': 5, '星期六': 6, '星期日': 7}

    value1 = c[day1]

    value2 = c[day2]

    if value1 > value2:

        return 1

    if value1 < value2:

        return -1

    return 0



a = ['星期一', '星期三', '星期二', '星期日']

from functools import cmp_to_key

a.sort(key=cmp_to_key(compare_day))

print(a)

a = ['星期一', '星期三', '星期二', '星期日']

c = {'星期一': 1, '星期二': 2, '星期三': 3, '星期四': 4, '星期五': 5, '星期六': 6, '星期日': 7}

print(sorted(a, key=c.__getitem__))

data = [('red', 1), ('blue', 1), ('red', 2), ('blue', 2)]

from operator import itemgetter

standard_way = sorted(data, key=itemgetter(0), reverse=True)

double_resvered = list(reversed(sorted(reversed(data), key=itemgetter(0))))

assert standard_way == double_resvered

print(standard_way)

print(double_resvered)