enumerate in Python
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*Memos:
* My post explains range().
* My post explains zip().
* My post explains variable assignment.
* My post explains iterable unpacking in variable assignment.
* My post explains `*` for iterable unpacking in variable assignment.
* My post explains `[]` and `()` for variables in variable assignment.
* My post explains `[]` and `()` for variables in `for` statement.
enumerate() can create the iterable which has an iterable with the numbers incremented by 1 as shown below:
*Memos:
* The 1st argument is `iterable`(Required-Type:`iterable`).
* The 2nd argument is `start`(Optional-Default:`0`-Type:`int`).
* The iterable cannot be directly accessed with index so use list() to access it with index.
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])
# Error
i, f = list(enumerate(iterable=fruits))[0]
i, f = list(enumerate(iterable=fruits, start=0))[0]
print(i, f)
# 0 Apple
i, f = list(enumerate(iterable=fruits, start=7))[0]
print(i, f)
# 7 Apple
for 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 Mango
for 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 = enumerate
print(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 Apple
for 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 = enumerate
print(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
fruits = ["Apple", "Orange", "Banana", "Kiwi", "Lemon", "Mango"]
print(list(zip(range(-6, 8, 3), enumerate(fruits, start=7))))
# [(-6, (7, 'Apple')),
# (-3, (8, 'Orange')),
# (0, (9, 'Banana')),
# (3, (10, 'Kiwi')),
# (6, (11, 'Lemon'))]
print(list(zip(range(-6, 8, 3), enumerate(fruits, start=7)))[0])
# (-6, (7, 'Apple'))
i, jf = list(zip(range(-6, 8, 3), enumerate(fruits, start=7)))[0]
print(i, jf)
# -6 (7, 'Apple')
i, (j, f) = list(zip(range(-6, 8, 3), enumerate(fruits, start=7)))[0]
i, [j, f] = list(zip(range(-6, 8, 3), enumerate(fruits, start=7)))[0]
print(i, j, f)
# -6 7 Apple
for i, jf in zip(range(-6, 8, 3), enumerate(fruits, start=7)):
print(i, jf)
# -6 (7, 'Apple')
# -3 (8, 'Orange')
# 0 (9, 'Banana')
# 3 (10, 'Kiwi')
# 6 (11, 'Lemon')
for i, (j, f) in zip(range(-6, 8, 3), enumerate(fruits, start=7)):
for i, [j, f] in zip(range(-6, 8, 3), enumerate(fruits, start=7)):
print(i, j, f)
# -6 7 Apple
# -3 8 Orange
# 0 9 Banana
# 3 10 Kiwi
# 6 11 Lemon
