python:读取json和循环字典 [英] python: read json and loop dictionary
问题描述
import json
output_file = open('output.json' ()
output_json = json.loads(output_file)
在output_json中为
打印i
在output_json [i]中的k:
打印k,output_json [i] [k]
print output_json ['webm'] ['audio']
print output_json ['h264'] ['video']
print output_json ['ogg']
这里的JSON:
pre>
{
webm:{
video:libvp8,
audio:libvorbis
,
h264:{
video:libx264,
audio:libfaac
},
ogg b $ bvideo:libtheora,
audio:libvorbis
}
}
这里输出:
> h264
音频libfaac视频libx264
ogg
>音频libvorbis视频libtheora webm
>音频libvorbis视频libvp8 libvorbis
> libx264 {u'audio':u'libvorbis',
> u'video':u'libtheora'}
似乎一般很好。
没有必要先读取文件,然后使用加载。您可以直接使用负载。
output_json = json.load(open('/ tmp / output.json'))
使用i和k不正确。它们通常仅用于整数循环计数器。在这种情况下,它们是钥匙,所以更合适的东西会更好。可能将 i
重命名为 container
和 k
as 流
?传达更多信息的东西将更容易阅读和维护。
您可以使用 output_json.iteritems()
在同一时间重复键和值两者。
为majorkey,在output_json.iteritems()中扣除:
print majorkey
for subkey,value in subdict.iteritems():
print subkey,value
I'm learning python and i loop like this the json converted to dictionary: it works but is this the correct method? Thank you :)
import json
output_file = open('output.json').read()
output_json = json.loads(output_file)
for i in output_json:
print i
for k in output_json[i]:
print k, output_json[i][k]
print output_json['webm']['audio']
print output_json['h264']['video']
print output_json['ogg']
here the JSON:
{
"webm":{
"video": "libvp8",
"audio": "libvorbis"
},
"h264": {
"video": "libx264",
"audio": "libfaac"
},
"ogg": {
"video": "libtheora",
"audio": "libvorbis"
}
}
here output:
> h264
audio libfaac video libx264
ogg
> audio libvorbis video libtheora webm
> audio libvorbis video libvp8 libvorbis
> libx264 {u'audio': u'libvorbis',
> u'video': u'libtheora'}
That seems generally fine.
There's no need to first read the file, then use loads. You can just use load directly.
output_json = json.load(open('/tmp/output.json'))
Using i and k isn't correct for this. They should generally be used only for an integer loop counter. In this case they're keys, so something more appropriate would be better. Perhaps rename i
as container
and k
as stream
? Something that communicate more information will be easier to read and maintain.
You can use output_json.iteritems()
to iterate over both the key and the value at the same time.
for majorkey, subdict in output_json.iteritems():
print majorkey
for subkey, value in subdict.iteritems():
print subkey, value
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