Python 如何使用 `enumerate` 迭代 `dict` 并随着迭代解压索引、键和值
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How to iterate `dict` with `enumerate` and unpack the index, key, and value along with iteration
提问by themink
How to iterate dictwith enumeratesuch that I could unpack the index, key and value at the time of iteration?
如何迭代dict，enumerate以便我可以在迭代时解压索引、键和值？
Something like:
就像是：
for i, (k, v) in enumerate(mydict):
# some stuff
I want to iterate through the keys and values in a dictionary called mydictand count them, so I know when I'm on the last one.
我想遍历字典中的键和值mydict并计算它们，所以我知道我什么时候在最后一个。
回答by Moinuddin Quadri
Instead of using mydict, you should be using mydict.items()with enumerateas:
mydict您应该使用mydict.items()withenumerate作为，而不是使用：
for i, (k, v) in enumerate(mydict.items()):
# your stuff
Sample example:
示例：
mydict = {1: 'a', 2: 'b'}
for i, (k, v) in enumerate(mydict.items()):
print("index: {}, key: {}, value: {}".format(i, k, v))
# which will print:
# -----------------
# index: 0, key: 1, value: a
# index: 1, key: 2, value: b
Explanations:
说明：
enumeratereturns an iterator object which contains tuples in the format:[(index, list_element), ...]dict.items()returns an iterator object (in Python 3.x. It returnslistin Python 2.7)in the format:[(key, value), ...]- On combining together,
enumerate(dict.items())will return an iterator object containing tuples in the format:[(index, (key, value)), ...]
enumerate返回一个迭代器对象，其中包含以下格式的元组：[(index, list_element), ...]dict.items()以以下格式返回一个迭代器对象（在 Python 3.x 中。它list在 Python 2.7 中返回）：[(key, value), ...]- 组合在一起时，
enumerate(dict.items())将返回一个包含以下格式元组的迭代器对象：[(index, (key, value)), ...]
