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Python3 pre-flight

Below are instructions regarding installing things needed for general development with Python3 (including two example libraries). They include:

Xcode / The Command Line Tools

Do you have Xcode? To check go to the terminal and execute xcode-select -p.

  • If /Applications/Xcode.app/Contents/Developer (or something similar) appears as a response proceed to the next step.
  • If anything else happens download and install Xcode from here before moving on.

Enter xcode-select --install into the terminal, which should result in something like this:

Click Install to download and install the Xcode Command Line Tools (it takes a while so maybe go make some food or get a cup of coffee or something).

Homebrew

Copy and paste this code into the terminal and press enter to install homebrew: /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

If prompted, agree to the Xcode license

by executing sudo xcodebuild -license in the terminal.

Search to see if something is available on homebrew with search. For example: brew search python3

Python3

To install Python3 execute brew install python3 in the terminal.

PyPI

PyPi is frequently referred to as pip. It is used to manage Python library installations and ships with Python3 when installed via Homebrew. The command to use it is pip3, not pip.

Search for something on pip3 with the search command. For example: pip3 search jupyter

Jupyter

Install Jupyter via pip3 as follows:

  1. pip3 install --upgrade pip
  2. pip3 install jupyter

Executing jupyter notebook in the terminal starts the IDE.

On the Jupyter homepage click New and select Python3. This will create and open an iPython Notebook file.

Click File, select Save As and then name the file. Next click File and select Close and Halt to exit.

When you return to the Jupyter homepage you should see the iPython Notebook file (.ipynb) that you just saved.

BeautifulSoup4

pip3 install beautifulsoup4

lxml

pip3 install lxml

Natural Language Toolkit

sudo pip3 install -U nltk

Confirm that it works with the following steps (all in the terminal):

  1. ipython3
  2. import nltk
  3. nltk. and then hit the TAB key on your keyboard

NLTK Things

Run Jupyter, navigate to the file you created earlier, import the NLTK library, then run the downloader in the following steps:

  1. jupyter notebook
  2. Navigate to the file, open it
  3. import nltk
  4. nltk.download()

A new terminal window will open that looks like the image below. Select book and click Download: