python - 对数组中的特定值进行分组

Question

假设我有一个像这样的数组:

namesscore = ["Rory: 1", "Rory: 4", "Liam: 5", "Liam: 6", "Erin: 8", "Liam: 2",]

我想对该数组进行排序，使其像这样:

namescore = ["Rory: 1, 4", "Liam: 5, 6, 2", "Erin: 8"]

我该怎么做？

Answer 1

我会迭代列表，并为每个项目将其拆分为名称和分数。然后，我创建一个字典(更准确地说:一个 OrderedDict，以保留顺序)并累积每个名称的分数。迭代完成后，可以将其转换为所需格式的字符串列表:

from collections import OrderedDict

def group_scores(namesscore):
    mapped = OrderedDict()
    for elem in namesscore:
        name, score = elem.split(': ')
        if name not in mapped:
            mapped[name] = []
        mapped[name].append(score)

    return ['%s%s%s' % (key, ': ', ', '.join(value)) for \
              key, value in mapped.items()]