在 yaml.dump Python 中强制引用

在我进入之前，是的，我已经研究过它并且知道 YAML 不区分引号和非引号，而只是按原样获取类型。坦率地说，我认为没有引号更好，但不幸的是这不是我需要的。所以请尝试理解我have研究了这个问题，但仍然需要我的字符串对象周围的引号。

在我的代码中我有一本字典：

data = {dic:[{A:''}, {B:''}, {C:''}, {D:''},...]}

the 'var*'通过 PyQt4 构建QLineEdit代码行提取的类看起来像这样：

var* = str(QtGui.QLineEdit().displayText())

所以当我这样做时data['dic'][index]['A'-'Z'] = var*

它成为了data = {dic:[{A: 'var1'}, {B:'var2'}, {C:'var3'}, {D:'var4'},...]}

然后我转储所有数据：

prettyData = yaml.dump(data, default_flow_style=False, width=10000000)

and print prettyData我明白了：

dic:
  - A: var1
  - B: var2
  - C: var3
  - D: var4
  ...

我尝试了很多方法来让它们出现：

dic:
  - A: 'var1'
  - B: 'var2'
  - C: 'var3'
  - D: 'var4'
  ...

但还没有成功。我听到了关于这个问题的不同意见，从“不可能”到“只需在它们周围加上引号”，正如你所看到的，就我而言，我不能这样做。

关于如何解决这个问题有什么想法吗？

您可以覆盖标量的发射器并更改动态发射的值的样式。根据您拥有的其余标量值，您可能需要进行更多测试才能取消设置is_string。到......的时候process_scalar被称为您不再知道原始值，您只有一个带有（unicode）字符串值的事件。

import sys
import ruamel.yaml as yaml

yaml_str = """\
dic:
  - A: var1    # need to get these strings quoted
  - B: var2
  - C: var3
  - D: var4
  - E: 3       # leave this alone
"""

# the scalar emitter from emitter.py
def process_scalar(self):
    if self.analysis is None:
        self.analysis = self.analyze_scalar(self.event.value)
    if self.style is None:
        self.style = self.choose_scalar_style()
    split = (not self.simple_key_context)
    # VVVVVVVVVVVVVVVVVVVV added
    if split:  # not a key
        is_string = True
        if self.event.value and self.event.value[0].isdigit():
            is_string = False
        # insert extra tests for scalars that should not be ?
        if is_string:
            self.style = "'"
    # ^^^^^^^^^^^^^^^^^^^^
    # if self.analysis.multiline and split    \
    #         and (not self.style or self.style in '\'\"'):
    #     self.write_indent()
    if self.style == '"':
        self.write_double_quoted(self.analysis.scalar, split)
    elif self.style == '\'':
        self.write_single_quoted(self.analysis.scalar, split)
    elif self.style == '>':
        self.write_folded(self.analysis.scalar)
    elif self.style == '|':
        self.write_literal(self.analysis.scalar)
    else:
        self.write_plain(self.analysis.scalar, split)
    self.analysis = None
    self.style = None
    if self.event.comment:
        self.write_post_comment(self.event)

data = yaml.load(yaml_str, Loader=yaml.RoundTripLoader)
dd = yaml.RoundTripDumper
dd.process_scalar = process_scalar
yaml.dump(data, sys.stdout, Dumper=dd)

并得到输出：

dic:
- A: 'var1'    # need to get these strings quoted
- B: 'var2'
- C: 'var3'
- D: 'var4'
- E: 3         # leave this alone

¹ _{This was done using ruamel.yaml https://pypi.python.org/pypi/ruamel.yaml of which I am the author. That package is an enhancement of PyYAML. You might be able to do something similar with the latter, but it would drop the comments that are in the input.}