Python Jumpstart by Building 10 Apps Transcripts
Chapter: App 6: LOLCat Factory
Lecture: LOLCat App on Linux
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Here we are in Ubuntu,
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let's try to call open and pass the folder and see what happens.
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Couldn't get a file descriptor referring to the console,
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that's not a super user experience,
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so what are we going to do. Well, like I said,
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we need to run a different open command on Linux,
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different one on OS X and a different one on Windows,
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now there are variety ways to determine what basic platform you are working on
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we could go and import the OS module and say OS.name
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and it will say pause x for Linux, and nt for Windows,
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but it doesn't distinguish between OS X and Linux.
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So we need another way which we can get with this platform module
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so we can say if platform.system
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now platform is another module we have to import so again
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we'll let PyCharm do that.
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You have to kind of experiment with it to see what it returns
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but on OS X it returns Darwin, on Linux it returns Linux
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and on Windows it returns Windows,
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so that should be pretty easy,
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let's say Darwin if it's Darwin we are going to do what
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we have already been doing, that was great,
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otherwise, we want to come here and say elif it returns Windows
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we'll say start and elif if it returns Linux we'll say xdg-open
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and finally we'll do an else and say print we don't support your OS.
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And we could even show it to you.
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Like so, now I suppose spelling Darwin correctly would help, wouldn't it?
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Ok, so OS X, Darwin, Windows Windows, Linux Linux, let's try it.
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Excellent, here are our cats let's have a look,
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I are dune cat, I control the spice, kkkkkkkkk cat and so on
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now notice one of these is actually off,
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I know that one of these images actually is a gif not a jpg
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and apparently this little viewer doesn't understand that
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from the metadata in the header it just looks at that extension, whatever
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that's not really a big problem
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we'd have to check what the file extension is when we save it.
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So pretty cool, we were able to use platform.sys
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to determine what sub-process to call.
