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Getting the last value of a key value pair in a json like string

I have a json like string (incomplete json) in which I am trying to retrieve the value of the last key:value pair. The incomplete json like string looks like this:
"BaseCode":null,"BrokerSymbol":null,"CustID":null,"SynthDesc":""}],"#nexturl":"https://someurl.com"}
I am trying to access the value of the #nexturl key and this is the code I've till now:
str1.split(":")[-1]
this gives the output //someurl.com. 2 issues here are that splitting on : removes the https prefix and also doesn't seem like a great approach as if the url contains any more : it will split on that. Is there someway I can get the entire value of #nexturl key?

As requested, assuming your string is as follows:
mystr = '"BaseCode":null,"BrokerSymbol":null,"CustID":null,"SynthDesc":""}],"#nexturl":"https://someurl.com"}'
You can grab the key:value pair containing “#nexturl” by using:
mystr[mystr.index('"#nexturl":'):len(mystr)-1]

Reading JSON file using json.load

I have a simple file (username.json) as shown below:
{"lastname": "doe", "firstname": "john"}
I use the following code to read the file:
with open(filename) as file_obj:
dictionary = json.load(file_obj)
print(dictionary['firstname'])
But when I print the dictionary value for the key "firstname" it prints nothing.
When I print the dictionary I get the following:
{u'lastname': u'doe', u'firstname': u'john'}
I know that "u" stands for unicode but for some reason I am not able to use the firstname and lastname keys.
UPDATE:
For some reason it works now!

json.loads converts a json object to the python equivalent.
This means it uses lists and dicts instead of arrays and objects. You are seeing the representation of the former.
doctionary["firstname"] will get you the value in first name (ie, "doe") while it's still a python object.
If you want to see json again, you'll need to pass it through json.dumps - but of course you won't be able to manipulate it as above when in that format.

Getting the value of a key in a dict

I try to get the value of a key in a dict by :
print User['LocationName']
This is giving me a TypeError: string indices must be integers, not str error.
This is the dict
{u'LocationName': u'home', u'First Name': u'Bob',...... }
I'm not sure what this error means

User is not a dict. User is a string. Figure out why it's a string, and change that.

The error means that you are trying to access a "part" of your string as if it was a list. But you are not using a integer as parameter to access a list, you are using a string.

Try to use:
eval(User)
then you can:
print User['LocationName']
This usually happens when you save a JSON into a file, using python. It's like Python saved your dict as a dict Object, but when you read from the file, the object is read by string. So, when you call eval(), you get a dict again.

Parse JSON in python to a dictionary

A bit lost after much research. My code below parses the JSON to a dictionary I have thought using json load
response = json.load(MSW) # -->Will take a JSON String & Turn it into a python dict
Using the iteration below I return a series like this which is fine
{u'swell': {u'components': {u'primary': {u'direction': 222.5}}}}
{u'swell': {u'components': {u'primary': {u'direction': 221.94}}}}
ourResult = response
for rs in ourResult:
print rs
But how oh how do I access the 222.5 value. The above appears to just be one long string eg response[1] and not a dictionary structure at all.
In short all I need is the numerical value (which I assume is a part of that sting) so I can test conditions in the rest of my code. Is is a dictionary? With thanks as new and lost

You have to use python syntax as follows:
>>> print response['swell']['components']['primary']['direction']
222.5

Just access the nested dictionaries, unwrapping each layer with an additional key:
for rs in ourResult:
print rs['components']['primary']['direction']

How To Format a JSON Text In Python?

When I call the JSON file for Vincent van Gogh's List of Works wikipedia page, using this url,
it obviously returns a huge blob of text which I believe is some sort of dictionary of lists.
Now, someone has already shown me Python's import wikipedia feature, so skip that. How can I decode this JSON? I feel like I have tried everything in Python 3's library, and always get an error, like I get if I try this code for example:
data = urllib.request.urlopen(long_json_url)
stuff = json.load(data) #or json.loads(data)
print(stuff)
it returns
TypeError: the JSON object must be str, not 'bytes'
Or if I try this code:
data = urllib.request.urlopen(longurl)
json_string = data.read().decode('utf-8')
json_data = json.loads(json_string)
print(json_data)
It doesn't return an error, but just what looks like nothing
>>>
>>>
But if I highlight that empty space and paste it, it pastes the same blob of text.
{'warnings': {'main': {'*': "Unrecognized parameter: 'Page'"}}, 'query': {'normalized': [{'from': 'list of works by Vincent van Gogh',... etc
If I try a for loop:
for entry in json_data:
print(entry)
It returns
>>>
query
warnings
>>>
And that's it. So it's not returning an error there, but not really much else, just two values? How would you make the JSON data into a workable Python dict or list? Or at the very least, into a more vertical format that I could actually read?

How would you make the JSON data into a workable Python dict or list?
You're already doing that with
json_data = json.loads(json_string)
This however:
for entry in json_data:
print(entry)
will only print the keys of your dictionaries. If you want to print the values, you need to use:
for entry in json_data:
print(json_data[entry])
if you inspect the data, you'll see that there are two keys for the main dictionary. The ones you already got by iterating over the dict:
{u'query': {...}, u'warnings': {...}}