Update cheatsheets

pipenv

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pipenv
+
+> Simple and unified Python development workflow.
+> Manages packages and the virtual environment for a project.
+> More information: <https://pypi.org/project/pipenv>.
+
+- Create a new project:
+
+`pipenv`
+
+- Create a new project using Python 3:
+
+`pipenv --three`
+
+- Install a package:
+
+`pipenv install {{package}}`
+
+- Install all the dependencies for a project:
+
+`pipenv install`
+
+- Install all the dependencies for a project (including dev packages):
+
+`pipenv install --dev`
+
+- Uninstall a package:
+
+`pipenv uninstall {{package}}`
+
+- Start a shell within the created virtual environment:
+
+`pipenv shell`
+
+- Generate a `requirements.txt` (list of dependencies) for a project:
+
+`pipenv lock --requirements`