Python for Absolute Beginners Transcripts
Chapter: Using external Python packages
Lecture: Concept: External packages workflow

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0:00 Let's take just a moment and review
0:01 how we're using our external libraries or external packages.
0:05 We have a requirements.txt where in our program
0:08 we express this program is going to need
0:10 these external packages
0:12 or it's going to crash or not run or it just won't function.
0:15 So we put that in the requirements.txt somewhere
0:17 and then before we install the packages
0:20 you want to make sure you have
0:21 an isolated virtual environment.
0:23 So you do that one of two ways
0:25 depending on the operating system you're on.
0:26 A macOS and Linux you have this Python3 -m venv
0:30 that's the module, the command
0:32 and then venv is the directory
0:34 you can change that to be whatever you want.
0:35 Then you have to say . foldername/bin/activate.
0:38 On a Windows very similar
0:40 but it's no dot, and then venv\scripts\activate.
0:45 Once either of those are done
0:47 your prompt should change to have this little venv
0:49 or maybe in the future the folder name at the top there.
0:52 And then you just pip install the requirements
0:55 by saying -r and then the requirements file.
0:57 It doesn't have to be requirements.txt
1:00 but it probably should
1:01 because that's what the tools look for.
1:04 Then you can just start using your library
1:06 and import colorama, work with its elements
1:09 like this four class or four enumeration.
1:11 Here we want to say hi, with color.
1:13 Make that green? Easy now.