Python Jumpstart by Building 10 Apps Transcripts
Chapter: App 6: LOLCat Factory
Lecture: LOLCat App on Windows
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0:00
Finally, let's make sure the cat factory runs on Windows,
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and this is going to give me a chance to show you
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one more cool little feature of PyCharm,
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because this is not going to work.
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So I tried to run my app, is that huh, no module named requests.
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Of course, that should be a clue to you guys
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that hey maybe this system doesn't have requests installed,
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so we need to go out to the shell, or out to the console
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and say pip install requests that sort of thing,
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now you've seen when we were using request
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but we didn't import at the top
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PyCharm would say hey we will write the import statement for you at the top,
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but this is cool too, it says hey you are trying to use requests
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we know that this is a module form PyPi form the Python package index
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and you don't have it installed in your currently selected interpreter,
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but guess what, we'd be happy to do that for you
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so you can see down here installing packages request, hold on, done,
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so if we try to run this on Windows,
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you'll see that there is a small problem,
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it's pretty easily fixed but it's not entirely obvious why.
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So it says it cannot find the specified file, that's weird,
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and it's talking about start actually,
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we have two ways to fix this, we could say shell=true
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because apparently the start is just a shell command
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or we could be just more explicit about what we want to start
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and we could say we'd like to start explorer,
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let's just go with that to be consistent.
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Beautiful, here are lol cats the ones that you guys are now familiar with,
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and love so we've been able to use the platform.system
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to figure out the right command for each operating system
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and we have used xdg open for Linux,
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Explorer for Windows and open for OS X
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it's not the cleanest way to work in the world
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but when you are doing this cross platform stuff you know,
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sometimes you just got to put an if statement somewhere
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but it does list right app that run everywhere and that's pretty cool.
2:01
Let's do a quick review before we move on.
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So we started out printing the header,
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this you guys have it downcold, and then we worked with OS path
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to create check for and create our output folder
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and then we downloaded the cats.
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If we go down here remember we did a forin loop over the range of 128
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so that let us create our 8 cats
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and then we just called into our cat service.get_cat() module
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which we wrote over here, we can check that out,
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and we just went and downloaded the data using requests
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made sure to set string=true return the raw response
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and then use the shell util copy file object
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right from one stream, to the other stream.
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Then finally, we displayed the cats using the sub-process module
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and various operating system dependent apps
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that know how to somewhat display pictures to the user.
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Now we have our very own working lol cat factory.
