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