If you're not already in the root directory, type "cd ~" and hit enter.
Take the command you copied from Bitbucket and paste it into the console and hit "Enter".
It will prompt you for your Bitbucket password; it's in LastPass.
Clone the new repository in SourceTree.
Open SourceTree (it's software you keep on your computer).
Click 'Clone'
A dialog box will pop up. Click the button on the top-right to be shown a list of your online Bitbucket projects.
When you've selected it, the only thing you should have left to click is "Clone".
Create a PyCharm project in the new directory that SourceTree created on your hard drive.
In PyCharm, select File → New Project.
A modal will appear.
Fill out the fields of the modal.
Location: Click the "..." button and navigate to the folder created by SourceTree.
You may need to click into the 'Documents' folder to see the name of the folder, e.g. C:\Users\Nathan\Documents\project_name.
Interpreter: Ignore this / leave any value; we'll set the interpreter after creating the project.
Click 'Create'.
It'll ask you if you want to create the project from existing sources. Click 'Yes'.
Create a virtualenv with PyCharm.
With the project open, go to 'File' → 'Settings'
Navigate to "Project: project_name" → "Project Intepreter"
Click the gear icon in the top right and select "Create VirtualEnv".
Fill out the fields in the modal that appears.
Location:
Navigate to the project folder.
Name: Once you've selected the project folder, type 'venv' in the 'Name' field. This will create a new folder named 'venv' in the project folder.
Base interpreter: I'm guessing it's probably a good idea to set the base Python interpreter to be the same version as that used on PythonAnywhere.
To get the version used on PythonAnywhere, I start a Python session.
To install that version of Python, just go to the main Python website.
When it's installing, I made a note of the directory it was installed to.
The 'AppData' installation directory didn't show up in PyCharm because it's hidden.
...so I navigated to the directory in Windows Explorer and copied the path.
I then copied that path into PyCharm and added '/python.exe' to the end, and it found the file.
Inherit global site-packages: Leave this unchecked.
Make available to all projects: I generally leave this unchecked.
Click 'OK' in the 'Create Virtual Environment' modal.
You should see a screen like the one in the image.
Click 'OK' to save the changes.
Set up PyCharm to start the virtualenv every time you start a Terminal session.
Background / Explanation
We need to do this so that we can generate the 'requirements.txt' file.
Step-by-step instructions:
On the left-side folder-view pane, navigate to 'your_project/venv/Scripts/activate.bat', right-click the file, and select 'Copy Path'.
Go to File → Settings → Tools → Terminal → 'Shell path' and add "/K path/to/activate.bat" after the "cmd.exe". (Source)
Restart PyCharm.
Start a Terminal session and you should see the name of your virtualenv in parentheses on the command line. Running 'python' should start the version of python that you set earlier.
Create a 'requirements.txt' file in PyCharm.
Explanation:
We're doing this so that we can have our (not-yet-created) PythonAnywhere virtualenv download the necessary packages.
Step-by-step instructions: (You can find official instructions here.)
Start a Terminal session and run 'pip freeze > requirements.txt'. (Source)
(As you can see in the screenshot, it may prompt you to upgrade pip first.)
The file should appear, and when you open it it should have a list of packages and their versions.
Use SourceTree to push new files to the Bitbucket repository.
If you switch back to SourceTree you should see a list of files that SourceTree has noticed as being new.
Ignore the '.idea/' folder and the 'venv' folder.
We don't want to have our PyCharm files in the git repository (I think), so navigate to 'Actions' → 'Ignore'
Select 'Ignore everything beneath: .idea'
Once that's done those '.idea' files should disappear from the list of Unstaged files.
Also ignore the virtualenv folder. These pictures were created before I knew that, so they show me including the venv folder to be committed. Don't do that.
Select the box next to 'Unstaged files' to select the remaining files to be committed.
Name the virtualenv after your project, because the command to activate it has global scope (is that the way to describe it?), so you can't name all the virtualenvs "venv"; you'll have a name conflict.
Install the package requirements in your PythonAnywhere virtualenv.
Activate the virtualenv with "workon name_of_your_virtualenv".