Introducing Pipenv

To start, we need to install pipenv. 0:00 Ironically, we can use pip to install it. 0:03 Python, the -m flag, pip install pipenv. 0:06 Once it's installed, and inside our working directory, 0:16 we can install packages. 0:19 pipenv manages dependencies on a per-project basis. 0:21 Therefore, simply by installing packages, we can start using its benefits. 0:26 For our sample project here, let's install the popular requests library. 0:31 We do that with pipenv install requests. 0:37 By doing so, we see that pipenv has done a few things for us. 0:45 First, it created a virtual environment inside our directory. 0:50 It created a Pipfile for us to use, which we'll look at in more detail here shortly. 0:53 It downloaded the request library into our virtual environment and 0:59 it added it to the Pipfile. 1:03 Then it locked the dependencies in a file called Pipfile.lock. 1:05 We can also define which version of a package to install. 1:09 Let's install the Python Plotting Library, 1:13 matplotlib, and specify a specific version. 1:17 pipenv install, again, you want matplotlib and 1:21 we wanna pin it to version 2.2.2. 1:26 We see that it installs the package in the Pipfile and, 1:30 again, it locks the dependencies in Pipfile.lock. 1:34 Now what if we have packages that we will only need for development and 1:39 not in production? 1:42 We can do that as well. 1:44 Let's install pytest in a development-only mode. 1:46 Do pipenv install pytest and add the dev flag. 1:51 We see that pytest has been added and locked to a dev-packages area. 2:02 Let's write a quick script that we can run using pipenv. 2:07 Let's create a file in this directory called main.py. 2:12 We'll touch main.py and it'll open it. 2:16 So inside main.py, we'll import requests, 2:23 And we'll make a request of the Treehouse site. 2:30 So response will be requests. 2:33 Send a get request to teamtreehouse.com. 2:38 And then we'll simply print out the status code. 2:46 We ant response. 2:56 Status_code. 2:59 We want the string version of that. 3:01 Pretty basic script. 3:04 Let's save it and run it from the command line. 3:05 We can run it with pipenv 3:10 run python main.py. 3:14 And there's our result, a 200 code for okay. 3:18 Running our script with pipenv run, 3:23 make sure that our install packages are available. 3:25 In the next video, let's take a closer look at the two files pipenv created and 3:29 populated for us, Pipfile and Pipfile.log. 3:34