Question

我有逗号分隔的值，在嵌套大括号中包含逗号。具体来说，我将输入逗号分隔的C ++ 11对象。

例如，这是一个输入：

std::vector<int>{32, 45, 10}, std::array<std::string, 5>{"a", "bc", "def", "ghij", "whoa, this is, a toughie"}, 8, "foo, bar", {"initializer-list?", "no problem!", "(hopefully...)"}

这是我想要的输出：

[
    'std::vector<int>{32, 45, 10}',
    'std::array<std::string, 5>{"a", "bc", "def", "ghij", "whoa, this is, a toughie"}',
    '8',
    'foo, bar',
    '{"initializer-list?", "no problem!", "(hopefully...)"}'
]

但是python的csv给了我：

[
    'std::vector<int>{32',
    '45',
    '10}',
    'std::array<std::string',
    '5>{"a"',
    '"bc"',
    '"def"',
    '"ghij"',
    '"whoa',
    'this is',
    'a toughie"}',
    '8',
    'foo, bar', # at least this one works :/
    '{"initializer-list?"',
    '"no problem!"',
    '"(hopefully...)"}'
]

如何自定义csv模块来处理这些情况？

Answer 1

你可以使用正则表达式来分割每一行，然后稍后清理它

import re
a = r'std::vector<int>{32, 45, 10}, std::array<std::string, 5>{"a", "bc", "def", "ghij", "whoa, this is, a toughie"}, 8, "foo, bar", {"initializer-list?", "no     problem!", "(hopefully...)"}'

# split on occurrences of "}, s"
results = re.split('},\s+s', a)

注意：拆分会从每个字符串的末尾删除}（除了最后一个字符串），并且会从除第一个字符串之外的每个字符串中删除s。

编辑：

想要解决这个问题，并想出了以下内容（假设字符串中没有来自集合{,},",<,>的单个字符）。您可以通过更具体地预览cpp声明来删除<,>个案例。

a = r'std::vector<int>{32, 45, 10}, std::array<std::string, 5>{"a", "bc", "def", "ghij", "whoa, this is, a toughie"}, 8, "foo, bar", {"initializer-list?", "no problem!", "(hopefully...)"}'

l_braces = {"{", "<"}
r_braces = {"}", ">"}

def split(s):
  brace_count = 0
  quote_count = 0
  breaks = []

  for i, c in enumerate(s):

    if c == '"':
      quote_count += 1
      if quote_count % 2 == 1:
        brace_count += 1
      else:
        brace_count -= 1

    if (c in l_braces):
      brace_count += 1

    if (c in r_braces):
      brace_count -= 1

    if (c == ",") and (brace_count == 0):
      breaks.append(i)

  pieces = []

  lag = 0
  for b in breaks:
    pieces.append(s[lag:b].strip())
    lag = b+1

  pieces.append(s[breaks[-1]+1:].strip())
  return pieces

print(split(a))

print(split(a))将打印以下内容......

['std::vector<int>{32, 45, 10}',
 'std::array<std::string, 5>{"a", "bc", "def", "ghij", "whoa, this is, a toughie"}',
 '8',
 '"foo, bar"',
 '{"initializer-list?", "no problem!", "(hopefully...)"}']

Answer 2

您的CSV模块只有在找到逗号时才会分隔值。它并不关心其他符号。

要按照您想要的方式实现拼写，您必须以检测开口括号的方式扩展模块逻辑，例如＆＃34; {＆＃34;。当找到左括号时，应忽略所有逗号符号，直到找到结束括号。

这样你就可以获得所需的输出。

如何让csv阅读器忽略大括号内的逗号（卷曲，方形和角度）？

2 个答案:

编辑：