Python通过嵌套字典排序

Question

I'm working with the Twitch API and I have a large nested dictionary. How do I sift through it?

>>> r = requests.get('https://api.twitch.tv/kraken/streams/sibstlp', headers={'Accept': 'application/vnd.twitchtv.v2+json'})

then:

>>> print r.text
#large nested dictionary starting with
#{"stream":{"_links":{"self":"https://api.twitch.tv/kraken/streams/sibstlp"},

interestingly:

>>> r.text
# large nested dictionary starting with
#u'{"stream":{"_links":{"self":"https://api.twitch.tv/kraken/streams/sibstlp"},

Does anyone know why r.text is different from print r.text?

How do I work through the dictionaries to get the information out that I'm looking for? I'm currently trying:

>>> r.text[stream]
NameError: name 'stream' is not defined

Thanks

Answer 1

print r.text returns the str version of the object, while r.text returns the repr version of the object.

>>> x = 'foo'
>>> print x     #equivalent to : print str(x)
foo
>>> print str(x)
foo
>>> x           #equivalent to  : print repr(x)
'foo'
>>> print repr(x)
'foo'

Your keys of that dictionary are strings, if you use r.text[stream] then python will look for a variable named stream and as it is not found it'll raise NameError .

Simply use : r.text['stream']

Demo:

>>> d= {"stream":{"_links":{"self":"https://api.twitch.tv/kraken/streams/sibstlp"}}}
>>> d['stream']
{'_links': {'self': 'https://api.twitch.tv/kraken/streams/sibstlp'}}

Answer 2

First, you are trying to access an element in a string, not a dictionary. r.text simply returns the plain text of the request. To get the proper dictionary from a requests object, use r.json() .

When you try r.json()[stream] , Python thinks that you are looking for the value in the dictionary corresponding to they key located in variable stream . You have no such variable. What you want is the value corresponding to the key of the literal string 'stream'. Therefore, r.json()['stream'] should give you what you the next nested dictionary. If you want that url, then r.json()['stream']['_links']['self'] should return it.

See Ashwini's answer for why print r.text and r.text are different.