当前我有一个产生的迭代器:
(0, 10), (10, 20), (20, 30), (30, 40), (40, 50), (50, 56), (56, None)
我想生产的东西:
[["current": "0", "next":"10", "default": "value"], ["current": "10", "next":"20", "default": "value"]],
到目前为止我拥有的东西:
('default', (0, 10)), ('default', (10, 20)), ('default', (20, 30)), ('default', (30, 40)), ('default', (40, 50)), ('default', (50, 56)), ('default', (56, None))
我可以从我的元组列表中制作词典做什么更改?
这是复制我拥有的代码:
start = 0
end = 56
step = 10
part = itertools.islice(range(end), start, end, step)
end = [end]
iterables = itertools.chain(part, end)
items, nexts = itertools.tee(iterables)
# items = [0, 10, 20, 30, 40, 50, 56]
nexts = itertools.chain(itertools.islice(nexts, 1, None), [None])
# next = [10, 20, 30, 40, 50, 56, None]
results = itertools.zip_longest(items, nexts)
# [(0, 10), (10, 20), (20, 30), (30, 40), (40, 50), (50, 56), (56, None)]
static = "default"
result = zip(itertools.repeat(static),results)
print(list(result))
请注意,我只想使用itertools
完成此操作,如果可能
在这种情况下,编写自己的生成器函数可能更可读。例如:
def items():
start = 0
end = 56
step = 10
while True:
d = {"current": start,
"next": start + step if start + step < end else end if start < end else None,
"default": "value"}
yield d
if start >= end:
break
else:
start += step
if start > end:
start = end
print(list(items()))
输出:
[{'current': 0, 'next': 10, 'default': 'value'},
{'current': 10, 'next': 20, 'default': 'value'},
{'current': 20, 'next': 30, 'default': 'value'},
{'current': 30, 'next': 40, 'default': 'value'},
{'current': 40, 'next': 50, 'default': 'value'},
{'current': 50,'next': 56, 'default': 'value'},
{'current': 56, 'next': None, 'default': 'value'}]
从您的一系列元组中,您可以进行列表理解(或发电机表达式(,例如:
[{"current": str(x), "next": str(y), "default": "value"} for x, y in data]
测试代码:
data = ((0, 10), (10, 20), (20, 30), (30, 40), (40, 50), (50, 56), (56, None))
print([{"current": str(x), "next": str(y), "default": "value"} for x, y in data])
结果:
[
{'current': '0', 'next': '10', 'default': 'value'},
{'current': '10', 'next': '20', 'default': 'value'},
{'current': '20', 'next': '30', 'default': 'value'},
{'current': '30', 'next': '40', 'default': 'value'},
{'current': '40', 'next': '50', 'default': 'value'},
{'current': '50', 'next': '56', 'default': 'value'},
{'current': '56', 'next': 'None', 'default': 'value'}
]