Python:如何在省略注释的情况下从属性文件创建字典 [英] Python: How to create a dictionary from properties file while omitting comments

问题描述

我已经在这里搜索答案了一段时间，但是没有找到它，所以希望这不是一个骗子.

I've searched for the answer to this here for awhile and haven't found it, so hope this isn't a dupe.

我有一个属性文件，其中大多数包含键=值对，但也包含#comments.我需要将其放入字典中，以便可以随意获取值.在没有#comments的文件中，以下内容可以完美地工作.

I have a properties file that mostly contains key=value pairs, but also contains #comments. I need to put it in a dictionary so I can grab values at will. In a file without #comments, the following works perfectly.

myprops = dict(line.strip().split('=') for line in open('/Path/filename.properties'))
print myprops['key']

但是，当有评论存在时，情况并非如此.如果存在#comment，则字典会显示

But not so when there are comments present. If there's #comment present, dictionary says

"ValueError: dictionary update sequence element #x has length 1, 2 is required"

我尝试使用条件将字典创建包装在

I've tried wrapping the dictionary creation in conditionals with

if not line.startswith('#'):

但是我似乎无法使它正常工作.有什么建议吗?谢谢！

But I can't seem to get that to work. Suggestions? Thanks!

推荐答案

要解决关于空行的最新约束，我会尝试以下方法:

To address your newest constraint about blank lines, I would try something like:

myprops = {}
with open('filename.properties', 'r') as f:
    for line in f:
        line = line.rstrip() #removes trailing whitespace and '\n' chars

        if "=" not in line: continue #skips blanks and comments w/o =
        if line.startswith("#"): continue #skips comments which contain =

        k, v = line.split("=", 1)
        myprops[k] = v

这很清楚，而且很容易添加额外的约束，而使用dict理解会很肿.但是，您总是可以很好地格式化它

It's very clear and it's easy to add on extra constraints, whereas using a dict comprehension will get quite bloated. However, you could always format it nicely

myprops = dict(line.strip().split('=') 
               for line in open('/Path/filename.properties'))
               if ("=" in line and 
                   not line.startswith("#") and
                   <extra constraint> and
                   <another extra constraint>))

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