From 069bff2ed098913182be4c9317ef7c5a393d0716 Mon Sep 17 00:00:00 2001
From: Prabhu Ramachandran
Date: Sat, 14 Aug 2021 19:19:44 +0530
Subject: Adding slides on conda.
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+---
+jupyter:
+ jupytext:
+ text_representation:
+ extension: .md
+ format_name: markdown
+ format_version: '1.2'
+ jupytext_version: 1.3.2
+ kernelspec:
+ display_name: Python 3
+ language: python
+ name: python3
+---
+
+
+An introduction to Conda
+======================
+
+
+
+
+
+
+
+August 12, 2021
+
+
+
+Department of Aerospace Engineering, IIT Bombay
+
+
+
+Prabhu Ramachandran
+
+
+
+
+
+
+Agenda
+------
+
+- Introduction to conda
+- Basic usage and practices
+- Conda environments
+
+
+
+
+Why
+------
+
+- Very popular
+- Helps manage large, complex, binary packages
+- Do not have to be superuser/administrator
+
+
+
+
+
+Installation and setup
+-------------
+
+- Two popular installers: anaconda and miniconda
+
+
+- Download/install miniconda for your operating system
+- https://docs.conda.io/en/latest/miniconda.html
+- Install it
+- Activate it for your shell
+
+
+
+
+Environments
+---------
+
+- Isolated Python universe
+- Does not affect other environments
+- Cheap to create
+- Easy to maintain
+
+
+
+
+
+Preliminaries
+------
+
+- Make sure you have installed conda
+- Start a terminal and activate conda
+
+
+
+
+Let us get started
+---------
+
+- List the existing environments
+
+```bash
+$ conda info --envs
+```
+
+- Avoid messing with the base environment
+
+- Use help
+
+```bash
+$ conda --help
+$ conda info --help
+$ conda create --help
+```
+
+
+
+
+
+
+Creating an environment
+--------------
+
+```bash
+$ conda create --name myenv python numpy matplotlib ipython
+```
+or
+
+```bash
+$ conda create -n myenv python numpy matplotlib ipython
+```
+
+At least:
+
+```bash
+$ conda create -n myenv python
+```
+
+
+
+Specifying a Python version
+-----------------------------
+
+```bash
+$ conda create -n myenv python=3.8
+```
+
+
+
+
+Activating and using environments
+----------------------------------
+
+```bash
+$ conda activate myenv
+(myenv) $
+```
+or
+
+```bash
+$ source activate myenv
+(myenv) $
+```
+
+- Install packages
+```bash
+$ conda install scipy pandas
+```
+- Search
+```bash
+$ conda search scikit-learn
+```
+
+
+
+
+Activating and using environments
+----------------------------------
+
+- List
+
+```bash
+$ conda list
+
+$ conda list -n otherenv
+```
+
+- Remove packages
+
+```bash
+$ conda uninstall scikit-learn
+```
+
+
+
+
+
+Updating packages/environments
+----------------------------------
+
+- Inside an environment
+
+```bash
+(myenv) $ conda update scipy
+```
+
+- In another environment
+
+```bash
+$ conda update -n myenv scipy
+```
+
+- Everything
+
+```bash
+$ conda update --all
+```
+
+
+
+
+Deactivating and removing an environment
+--------------------------------
+
+```bash
+(myenv) $ conda deactivate
+```
+
+or
+
+```bash
+(myenv) $ deactivate
+```
+
+Switch to another:
+```bash
+(myenv) $ conda activate test
+(test) $
+```
+
+Remove the environment
+
+```bash
+$ conda remove -n myenv --all
+```
+
+
+
+
+Conda channels
+---------------
+
+- Identified by a name: defaults, conda-forge
+- Many user-created channels
+- conda-forge among the most useful
+
+- Adding at the top
+```bash
+$ conda config --add channels conda-forge
+```
+- Adding at the bottom
+```bash
+$ conda config --append channels new_channel
+```
+- Install from specific channel
+```bash
+$ conda install -c conda-forge pytorch
+```
+
+
+
+
+Sharing environments
+-------------
+
+- Dump list of packages
+```bash
+$ conda env export -n myenv > environment.yml
+```
+
+- Create
+```bash
+$ conda env create --file environment.yml
+```
+
+- OS specific:
+
+```bash
+$ conda list --explicit > pkgs.txt
+```
+
+```bash
+$ conda create -n junk --file pkgs.txt
+```
+
+
+
+
+Miscellaneous
+-------------
+
+- Update conda
+```bash
+$ conda update conda
+```
+- Detailed info
+```bash
+$ conda search scipy --info
+```
+
+```bash
+$ conda search -c conda-forge scipy=1.1
+$ conda search -c defaults "scipy>1.7" --info
+```
+
+
+
+Learning more
+-------------
+
+- https://conda.io/projects/conda/en/latest/user-guide/index.html
+- https://conda.io/projects/conda/en/latest/user-guide/cheatsheet.html
+
+
--
cgit