[英]Summing a list in Python - within a tuple and another list
Not sure if it's a dup - will delete if so, just haven't found one for this specific scenario. 不确定它是否是重复 - 如果是这样将删除,只是没有为此特定方案找到一个。 I have a complex list full of tuples, which contain strings and lists. 我有一个包含字符串和列表的复杂列表,其中包含元组。
I need to replace the deepest lists with int values, which are the sum of those lists. 我需要用int值替换最深的列表,这些值是这些列表的总和。 I've tried half a dozen loop combinations to tackle it - nothing seems to work. 我已经尝试了六个循环组合来解决它 - 似乎没有任何效果。
[('MED', [1, 1]), ('COP', [3, 1]), ('GRO', [1, 5]), ('RRE', [5, 3]), ('PRO', [4, 6])]
Needs to become: 需要成为:
[('MED', 2), ('COP', 4), ('GRO', 6), ('RRE', 8), ('PRO', 10)]
So that I can return the new list combo sorted by the values of the summed lists. 这样我就可以返回按汇总列表的值排序的新列表组合。
You can make a concise, readable comprehension with something like: 您可以使用以下内容进行简明易懂的理解:
[(abbr, sum(t)) for abbr, t in l]
result: 结果:
[('MED', 2), ('COP', 4), ('GRO', 6), ('RRE', 8), ('PRO', 10)]
Using map
使用map
Ex: 例如:
lst = [('MED', [1, 1]), ('COP', [3, 1]), ('GRO', [1, 5]), ('RRE', [5, 3]), ('PRO', [4, 6])]
print(list(map(lambda x: (x[0], sum(x[1])), lst)))
or list comprehension
或list comprehension
Ex: 例如:
print([(i[0], sum(i[1])) for i in lst])
Output: 输出:
[('MED', 2), ('COP', 4), ('GRO', 6), ('RRE', 8), ('PRO', 10)]
Let's use list comprehensions to solve it - 让我们使用列表推导来解决它 -
myList = [('MED', [1, 1]), ('COP', [3, 1]), ('GRO', [1, 5]), ('RRE', [5, 3]), ('PRO', [4, 6])]
myList_out = [(i[0],sum(i[1])) for i in myList]
myList_out
[('MED', 2), ('COP', 4), ('GRO', 6), ('RRE', 8), ('PRO', 10)]
By using collections.defaultdict. 通过使用collections.defaultdict。 : :
from collections import defaultdict
xList = [('MED', [1, 1]), ('COP', [3, 1]), ('GRO', [1, 5]), ('RRE', [5, 3]), ('PRO', [4, 6])]
testDict = defaultdict(int)
for key, val in xList:
testDict[key] = val[0] + val[1]
print(testDict.items())
lst = [('MED', [1, 1]),('COP', [3, 1]),('GRO', [1, 5]),('RRE', [5, 3]),('PRO', [4, 6])]
print [(text, sum(num)) for text, num in lst]
result: 结果:
[('MED', 2), ('COP', 4), ('GRO', 6), ('RRE', 8), ('PRO', 10)]
Try this: 尝试这个:
l1 = [('MED', [1, 1]), ('COP', [3, 1]), ('GRO', [1, 5]), ('RRE', [5, 3]), ('PRO', [4, 6])]
mod_l1 = [(abbr, sum(t)) for abbr, t in l1]
required_l1 = sorted(mod_l1, key=lambda order: order[1])
result: 结果:
[('MED', 2), ('COP', 4), ('GRO', 6), ('RRE', 8), ('PRO', 10)]
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