Python 中的枚举

fruits = ["apple", "orange", "banana", "kiwi", "lemon", "mango"]print(enumerate(iterable=fruits))print(enumerate(iterable=fruits, start=0))# <enumerate object at 0x793a2cf15200>print(list(enumerate(iterable=fruits)))print(list(enumerate(iterable=fruits, start=0)))# [(0, 'apple'),#  (1, 'orange'),#  (2, 'banana'),#  (3, 'kiwi'),#  (4, 'lemon'),#  (5, 'mango')]print(list(enumerate(iterable=fruits, start=7)))# [(7, 'apple'),#  (8, 'orange'),#  (9, 'banana'),#  (10, 'kiwi'),#  (11, 'lemon'),#  (12, 'mango')]print(list(enumerate(iterable=fruits))[0])print(list(enumerate(iterable=fruits, start=0))[0])# (0, 'apple')print(list(enumerate(iterable=fruits, start=7))[0])# (7, 'apple')print(enumerate(iterable=fruits)[0])print(enumerate(iterable=fruits, start=0)[0])print(enumerate(iterable=fruits, start=7)[0])# errori, f = list(enumerate(iterable=fruits))[0]i, f = list(enumerate(iterable=fruits, start=0))[0]print(i, f)# 0 applei, f = list(enumerate(iterable=fruits, start=7))[0]print(i, f)# 7 applefor i, f in enumerate(iterable=fruits):for i, f in enumerate(iterable=fruits, start=0):    print(i, f)# 0 apple# 1 orange# 2 banana# 3 kiwi# 4 lemon# 5 mangofor i, f in enumerate(iterable=fruits, start=7):    print(i, f)# 7 apple# 8 orange# 9 banana# 10 kiwi# 11 lemon# 12 mango

fruits = ["apple", "orange", "banana", "kiwi", "lemon", "mango"]enum = enumerateprint(list(enum(iterable=enum(iterable=fruits, start=7), start=-3)))# [(-3, (7, 'apple')),#  (-2, (8, 'orange')),#  (-1, (9, 'banana')),#  (0, (10, 'kiwi')),#  (1, (11, 'lemon')),#  (2, (12, 'mango'))]print(list(enum(iterable=enum(iterable=fruits, start=7), start=-3))[0])# (-3, (7, 'apple'))i, jf = list(enum(iterable=enum(iterable=fruits, start=7), start=-3))[0]print(i, jf)# -3 (7, 'apple')i, (j, f) = list(enum(iterable=enum(iterable=fruits, start=7), start=-3))[0]i, [j, f] = list(enum(iterable=enum(iterable=fruits, start=7), start=-3))[0]print(i, j, f)# -3 7 applefor i, jf in enum(iterable=enum(iterable=fruits, start=7), start=-3):    print(i, jf)# -3 (7, 'apple')# -2 (8, 'orange')# -1 (9, 'banana')# 0 (10, 'kiwi')# 1 (11, 'lemon')# 2 (12, 'mango')for i, (j, f) in enum(iterable=enum(iterable=fruits, start=7), start=-3):for i, [j, f] in enum(iterable=enum(iterable=fruits, start=7), start=-3):    print(i, j, f)# -3 7 apple# -2 8 orange# -1 9 banana# 0 10 kiwi# 1 11 lemon# 2 12 mango

fruits = ["Apple", "Orange", "Banana", "Kiwi", "Lemon", "Mango"]enum = enumerateprint(list(enum(enum(enum(fruits, start=7), start=-3), start=4)))# [(4, (-3, (7, 'Apple'))),#  (5, (-2, (8, 'Orange'))),#  (6, (-1, (9, 'Banana'))),#  (7, (0, (10, 'Kiwi'))),#  (8, (1, (11, 'Lemon'))),#  (9, (2, (12, 'Mango')))]print(list(enum(enum(enum(fruits, start=7), start=-3), start=4))[0])# (4, (-3, (7, 'Apple')))i, jkf = list(enum(enum(enum(fruits, start=7), start=-3), start=4))[0]print(i, jkf)# 4 (-3, (7, 'Apple'))i, (jk, f) = list(enum(enum(enum(fruits, start=7), start=-3), start=4))[0]i, [jk, f] = list(enum(enum(enum(fruits, start=7), start=-3), start=4))[0]print(i, jk, f)# 4 -3 (7, 'Apple')for i, jkf in enum(enum(enum(fruits, start=7), start=-3), start=4):    print(i, jkf)# 4 (-3, (7, 'Apple'))# 5 (-2, (8, 'Orange'))# 6 (-1, (9, 'Banana'))# 7 (0, (10, 'Kiwi'))# 8 (1, (11, 'Lemon'))# 9 (2, (12, 'Mango'))for i, (j, kf) in enum(enum(enum(fruits, start=7), start=-3), start=4):for i, [j, kf] in enum(enum(enum(fruits, start=7), start=-3), start=4):    print(i, j, kf)# 4 -3 (7, 'Apple')# 5 -2 (8, 'Orange')# 6 -1 (9, 'Banana')# 7 0 (10, 'Kiwi')# 8 1 (11, 'Lemon')# 9 2 (12, 'Mango')for i, (j, (k, f)) in enum(enum(enum(fruits, start=7), start=-3), start=4):for i, [j, [k, f]] in enum(enum(enum(fruits, start=7), start=-3), start=4):    print(i, j, k, f)# 4 -3 7 Apple# 5 -2 8 Orange# 6 -1 9 Banana# 7 0 10 Kiwi# 8 1 11 Lemon# 9 2 12 Mango