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,
0:04 and this is going to give me a chance to show you
0:06 one more cool little feature of PyCharm,
0:08 because this is not going to work.
0:10 So I tried to run my app, is that huh, no module named requests.
0:15 Of course, that should be a clue to you guys
0:18 that hey maybe this system doesn't have requests installed,
0:21 so we need to go out to the shell, or out to the console
0:24 and say pip install requests that sort of thing,
0:27 now you've seen when we were using request
0:29 but we didn't import at the top
0:31 PyCharm would say hey we will write the import statement for you at the top,
0:35 but this is cool too, it says hey you are trying to use requests
0:38 we know that this is a module form PyPi form the Python package index
0:41 and you don't have it installed in your currently selected interpreter,
0:46 but guess what, we'd be happy to do that for you
0:49 so you can see down here installing packages request, hold on, done,
0:53 so if we try to run this on Windows,
0:56 you'll see that there is a small problem,
0:59 it's pretty easily fixed but it's not entirely obvious why.
1:05 So it says it cannot find the specified file, that's weird,
1:09 and it's talking about start actually,
1:11 we have two ways to fix this, we could say shell=true
1:14 because apparently the start is just a shell command
1:17 or we could be just more explicit about what we want to start
1:21 and we could say we'd like to start explorer,
1:24 let's just go with that to be consistent.
1:29 Beautiful, here are lol cats the ones that you guys are now familiar with,
1:33 and love so we've been able to use the platform.system
1:37 to figure out the right command for each operating system
1:41 and we have used xdg open for Linux,
1:45 Explorer for Windows and open for OS X
1:48 it's not the cleanest way to work in the world
1:51 but when you are doing this cross platform stuff you know,
1:54 sometimes you just got to put an if statement somewhere
1:57 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.
2:04 So we started out printing the header,
2:06 this you guys have it downcold, and then we worked with OS path
2:09 to create check for and create our output folder
2:12 and then we downloaded the cats.
2:16 If we go down here remember we did a forin loop over the range of 128
2:20 so that let us create our 8 cats
2:22 and then we just called into our cat service.get_cat() module
2:26 which we wrote over here, we can check that out,
2:29 and we just went and downloaded the data using requests
2:32 made sure to set string=true return the raw response
2:34 and then use the shell util copy file object
2:37 right from one stream, to the other stream.
2:42 Then finally, we displayed the cats using the sub-process module
2:46 and various operating system dependent apps
2:49 that know how to somewhat display pictures to the user.
2:53 Now we have our very own working lol cat factory.