Python for Absolute Beginners Transcripts
Chapter: Reading and writing files in Python
Lecture: Concept: Reading JSON
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0:00
Lets quickly review loading data from a text file as JSON. So there's actually a couple of steps involved. We wanted to manage a global variable
0:09
so we had to say global rolls we're going to write to that ultimately. We need the JSON libraries so we imported that at the top.
0:16
We also saw that the working directory affects where Python looks for non-fully specified paths. Right, it's just rolls out JSON as well.
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It's wherever you are and if that's not where yo expect things don't work. So we use the os.path module to do all sorts of cool stuff.
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Get the directory from a file and then take a directory plus a file name and join it together in a operating system independent way.
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That was cool, we came up with files. And then we wanted to use the open function pass it the file, r to read
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set the encoding, store it in a variable fin. But we wanted to make sure we did that safely and closed it up no matter what
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so we put it in this with block into a context manager. Whew! Now we're finally ready to load our JSON and that's just one simple line.
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So we just say json.load, give it the file stream and boom, out comes the Python dictionary that was stored in that file.