如何将列表中的项目转换为元组？

Question

我创建了这个函数，它获取文件的内容并将其翻译成字典。我有正确的格式，但我似乎无法弄清楚如何将列表内容变成一个元组。

这是我的功能，它没有元组部分：

def read(file:open) -> dict:
    file_lines = file.read().splitlines()
    result_dict = dict()
    for string in file_lines:
        splitted = string.replace(':', ';')
        new_splitted = splitted.split(';')
        client_name = new_splitted[0]
        new_splitted = new_splitted[1:]
        result_dict[client_name] = new_splitted
    return result_dict

例如，我怎样才能使它成为一个元组？我尝试使用 tuple()、((x,))，但似乎没有任何效果。谢谢！

Answer 1

您可以将构造元组与tuple(sequence) 一起使用。

with open("portfolio1.txt", 'r') as f:
    d = dict()
    for line in f:
        line = line.rstrip()
        key, prevalue = line.split(':')
        d[key] = [tuple(item.split(',')) for item in prevalue.split(';')]
    print(d)

Answer 2

这是构建逻辑的另一种方式。此方法还处理字符串到整数的转换。

def splitter(item):
    split = item.split(',')
    return (split[0], int(split[1]), int(split[2]))

d = {}

with open('portfolio1.txt', 'r') as f:
    for line in f:
        k, vals = line.rstrip().split(':')
        v = [splitter(x) for x in vals.split(';')]
        d[k] = v

结果：

{'Alan': [('Intel', 20, 10),
          ('Dell', 10, 50),
          ('Apple', 80, 80),
          ('Dell', -10, 55)],
 'Barb': [('Intel', 20, 40),
          ('Intel', -10, 45),
          ('IBM', 40, 30),
          ('Intel', -10, 35)],
 ...

Answer 3

您可以使用pandas。只需确保将所有: 替换为之前的;。

df = pd.read_csv(f, sep = ";", header = None)
df.set_index(0).apply(lambda k: [tuple(str(j).split(",")) for j in k], 1).T.to_dict(orient="list")

{'Alan': [('Intel', '20', '10'),
  ('Dell', '10', '50'),
  ('Apple', '80', '80'),
  ('Dell', '-10', '55')],
 'Barb': [('Intel', '20', '40'),
  ('Intel', '-10', '45'),
  ('IBM', '40', '30'),
  ('Intel', '-10', '35')],
 'Carl': [('Intel', '30', '40'),
  ('Dell', '20', '50'),
  ('Intel', '-10', '60'),
  ('Apple', '20', '55')],
 'Dawn': [('Apple', '40', '80'),
  ('Apple', '40', '85'),
  ('Apple', '-40', '90'),
  ('nan',)]}

Answer 4

如下改变，

使用元组(x.split(,))

def read_db(file:open) -> dict:
    file_lines = file.read().splitlines()
    result_dict = dict()
    for string in file_lines:
        splitted = string.split(':')
        client_name = splitted[0]
        new_splitted = splitted[1]
        parts = new_splitted.split(';')
        # tuple(x.split(','))
        parts_tuple = [tuple(x.split(',')) for x in parts]
        result_dict[client_name] = parts_tuple

输出

{
    'Carl': [('Intel', '30', '40'), ('Dell', '20', '50'), ('Intel', '-10', '60'), ('Apple', '20', '55')],
    'Barb': [('Intel', '20', '40'), ('Intel', '-10', '45'), ('IBM', '40', '30'), ('Intel', '-10', '35')],
    'Alan': [('Intel', '20', '10'), ('Dell', '10', '50'), ('Apple', '80', '80'), ('Dell', '-10', '55')],
    'Dawn': [('Apple', '40', '80'), ('Apple', '40', '85'), ('Apple', '-40', '90')]
}