Python Jumpstart by Building 10 Apps Transcripts
Chapter: App 5: Real-time weather client
Lecture: Concept: Virtual Environments
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Before we completely step away from our weather app
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let's talk about the final concept virtual environments
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recall, virtual environments allow you to create isolated
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dedicated environments for a particular application
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in there you have a copy of the Python runtime
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and you have initially, basically no packages
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but you can use pip to install those packages
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and they won't conflict or battle with any of the machine wide ones
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you just have only what you need in this nice clean environment.
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It helps you understand how you deploy to production
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it helps you understand what requirements you want to tell other users to have
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they are going to run your scripts on their machines
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now just creating the virtual environment is not enough
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remember, you have to activate it so you change into the environment folder
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and into bin, and you say .space activate on OS X or Linux
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and on Windows you just say activate
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I believe it might be a batch file.
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But, you call activate and then your command prompt changes
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your path changes so that all the Python tools like Python itself
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pip and so on now run exclusively out of that environment.
