[英]How to iterate `dict` with `enumerate` and unpack the index, key, and value along with iteration
How to iterate dict
with enumerate
such that I could unpack the index, key and value at the time of iteration?如何使用
enumerate
迭代dict
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 mydict
and count them, so I know when I'm on the last one.我想遍历名为
mydict
的字典中的键和值并对它们进行计数,这样我就知道什么时候到了最后一个。
Instead of using mydict
, you should be using mydict.items()
with enumerate
as:而不是使用
mydict
,你应该使用mydict.items()
with enumerate
as:
for i, (k, v) in enumerate(mydict.items()):
# your stuff
Sample example:示例示例:
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
Explanation:解释:
enumerate()
returns an iterator object which contains tuples in the format: [(index, list_element), ...]
enumerate()
返回一个迭代器对象,它包含以下格式的元组: [(index, list_element), ...]
dict.items()
returns an iterator object (in Python 3.x. It returns list
in Python 2.7) in the format: [(key, value), ...]
dict.items()
返回一个迭代器对象(在 Python 3.x 中。它在 Python 2.7 中返回list
) ,格式为: [(key, value), ...]
enumerate(dict.items())
will return an iterator object containing tuples in the format: [(index, (key, value)), ...]
enumerate(dict.items())
将返回一个包含以下格式的元组的迭代器对象: [(index, (key, value)), ...]
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