python - 将python字符串转换为字典

Question

我有一个包含一行的 excel 文档，类似于:

{MGY: {1: 85, 2: 15}}
{MGY: {1:85, 2:15}, MWH: {1:99, 2:1}, MDE: {1:60, 2:40}, MIN: {1:60, 2:40}}
{MGY: {1:85, 2:15}}
{MWH: {1:99, 2:1}}
{MGY: {1:85, 2:15}}

当我尝试使用以下代码将行转换为字典时:

Python 2.7.6 (default, Mar 22 2014, 22:59:56) 
[GCC 4.8.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> meta = {u'CODE': u'N03', u'FABRIC': u'Jersey', u'Colour mix': u'{MGY: {1: 85, 2: 15}}', u'WEIGHT G': 165, u'Main': u'3:100', u'WEIGHT OZ': 4}
>>> colour_mix = meta['Colour mix']
>>> colour_mix
u'{MGY: {1: 85, 2: 15}}'
>>> import ast
>>> melange_items = ast.literal_eval(colour_mix)

我得到以下回溯:

Traceback (most recent call last):
  File "styles_fabric.py", line 194, in <module>
    styleMeta = fabric_composition(style)
  File "styles_fabric.py", line 185, in fabric_composition
    melange_items = ast.literal_eval(dd)
  File "/usr/lib/python2.7/ast.py", line 80, in literal_eval
    return _convert(node_or_string)
  File "/usr/lib/python2.7/ast.py", line 63, in _convert
    in zip(node.keys, node.values))
  File "/usr/lib/python2.7/ast.py", line 62, in <genexpr>
    return dict((_convert(k), _convert(v)) for k, v
  File "/usr/lib/python2.7/ast.py", line 79, in _convert
    raise ValueError('malformed string')
ValueError: malformed string

提取、转换字典中字符串的正确方法是什么？

Answer 1

我想你是想把 key 用引号引起来:

import ast
ast.literal_eval('{"MGY": {1: 85, 2: 15}}') # {'MGY': {1: 85, 2: 15}}

ast.literal_eval 可以 解析字符串文字，但 MGY 本身对它没有任何意义。