Python 3 Mac

1. Update Python 3 Mac
2. Python 3 Machine Learning Lottery

C implementation of Python 3 lrucache / MIT: fastparquet: 0.3.2: Python interface to the parquet format / BSD-3: feedparser: 5.2.1: parse feeds in Python / OSI Approved: filelock: 3.0.12: A platform independent file lock. / Public Domain: fiona: 1.8.13.post1: Fiona reads and writes spatial data files / BSD-3-Clause: flake8: 3.8.3: Your Tool.

• The same source code archive can also be used to build the Windows and Mac versions, and is the starting point for ports to all other platforms. Download the latest Python 3 and Python 2 source. Alternative Implementations. Gpg -verify Python-3.6.2.tgz.asc.
• Link to Installing Python 3.8.0+ on your Mac with pyenv podcast on anchorfm Recently I wrote a post entitled Installing the latest version of Python on Mac OS Catalina and overriding the old default pre-installed version about installing Python 3.7.7 on Mac OS Catalina with Homebrew.
• And then I did brew install python, and was hoping to see python3 when I do python -version. But it just shows me python 2.7.10. I want my default python to be python3 not 2.7. And I found a little clue from the website. Do I have a Python 3 installed? $ python -version Python 3.6.4.

This page tells you how to setup a Python programming environment for your Mac OS X computer and provides a step-by-step guide for creating and running a simple 'Hello, world' Python program. All of the software is freely available on the Web. These instructions are for MacOS X 10.13 (High Sierra), but the instructions for other recent versions of Mac OS X are similar.

Overview

The Python programming environment required by this booksite consists of:

• Python, that is, the Python compiler/interpreter.
• The Python standard libraries.
• IDLE, the Python Integrated DeveLopment Environment.
• The Tkinter, NumPy, and Pygame libraries, which are used by the booksite programs that do graphics or audio processing.
• The booksite library, that is, a set of modules that we developed specifically to support this booksite.
• The Terminal application that is bundled with Mac OS X.

Downloading and Installing Python, IDLE, Tkinter, NumPy, and Pygame

Update Python 3 Mac

Python 2 is bundled with Mac OS X. However, Python 3 is not. We recommend that you download and install Python 3, and use Python 3 exclusively when running programs associated with this booksite.

Perform these steps to download and install Python, IDLE, Tkinter, NumPy, and PyGame:

• Browse to the Python for Mac download page.

• In the resulting page click on the Download Python 3.6.5 button. Your browser will download the file python-3.6.5-macosx10.6.pkg to your Downloads directory.

• Using Mac Finder Manager, navigate to your Downloads directory, and double-click on the python-3.6.5-macosx10.6.pkg file to install Python, Tkinter, and IDLE. Use the default options. (It's OK to delete the python-3.6.5-macosx10.6.pkg file after the installation is complete.)

• Open a Terminal window. To do that, click on the Spotlight Search icon on the right end of the menu bar. (It has the appearance of a magnifying glass.) In the resulting dialog box, type Terminal.app followed by the Enter key.

• Download adobe acrobat free crack. In the Terminal window issue these commands to install NumPy and PyGame:

Perform these steps to test your installation:

• In the Terminal window issue the python3 command. You should see something like this:

• If you see that output, then your installation of Python, IDLE, and Tkinter was successful.

• At the Python >>> prompt, type import numpy followed by the Enter key. If no error messages appear, then your installation of NumPy was successful.

• At the Python >>> prompt, type import pygame followed by the Enter key. If no error messages appear, then your installation of PyGame was successful.

• At the Python >>> prompt, type exit() followed by the Enter key to exit Python.

• In the Terminal window issue the command idle3. If an IDLE window appears, then you have installed IDLE properly. Close the IDLE window.

• Close the Command Prompt window.

Downloading and Installing the Booksite Library

Perform these steps to download and install the booksite library:

• Use your Web browser to download this introcs-1.0.zip file to your /Users/yourusername/Downloads directory.

• In the Finder, double click on /Users/yourusername/Downloads/introcs-1.0.zip to unzip the file, thus creating a directory named /Users/yourusername/Downloads/introcs-1.0. (It's OK to delete the /Users/yourusername/Downloads/introcs-1.0.zip file after you have unzipped it.)

• Open a Terminal window.

• At any time the Terminal application has a working directory. Initially the working directory is /Users/yourusername. In the Terminal window issue the cd Downloads command to change your working directory to /Users/yourusername/Downloads, and then issue the cd introcs-1.0 command to change your working directory to /Users/yourusername/Downloads/introcs-1.0. (Incidentally, the cd . command changes your working directory to the 'parent' of the current working directory.)

• Issue the ls command to display the names of all files in your working directory. Make sure that a file named setup.py is in your working directory.

• Issue the python3 setup.py install --user command. The computer copies the files defining the booksite modules to a directory where Python can find them, and writes status messages to your Terminal window to indicate its progress.

Perform these steps to test your installation of the booksite library:

• In the Terminal window issue the python3 command.

• At the Python >>> prompt, type the statement import stdio followed by the Enter key. If Python generates no error messages, then you have installed the booksite library properly.

• At the Python >>> prompt, type exit() followed by the Enter key to exit Python.

• Close the Terminal window.

Configuring IDLE

So far you've downloaded and installed all of the software that you'll need. You should perform one more step before creating your first program: configure the IDLE programming environment. Follow these instructions:

• Open a Terminal window.

• In the Terminal window issue the command idle3 to launch IDLE.

• Click on the Python → Preferences.. menu item.

• Click on the General tab.

• Click on the Open Edit Window radio button.

• Click on the Ok button.

• Close the IDLE window.

• Close the Terminal window.

Composing Your First Program

Having installed Python, the Python standard libraries, IDLE, Tkinter, NumPy, Pygame, and the booksite libraries, and having configured IDLE, you are ready to compose your first Python program. Perform these instructions:

• Using the Mac Finder, create a directory named /Users/yourusername/hello.

• Keyboard maestro 8 2 – hot key tasking solution 9. Open a Terminal window.

• Issue the cd hello command to make the /Users/yourusername/hello directory your working directory.

• Issue the command idle3 & to launch IDLE. Note the trailing ampersand. The trailing ampersand tells the computer to run the idle3 program in the background, thereby leaving your Terminal application free to handle additional commands while IDLE is running.

• In IDLE, type the four-line Python program helloworld.py exactly as it appears below. Use the arrow keys, mouse, or touchpad to move within the text that you have typed. Use the Delete key to delete text. Be careful; the smallest typing mistake might cause the program to fail.

• When you are finished typing, in IDLE click on the File → Save.. menu item to save the Python program. Save it in a file named helloworld.py in the directory /Users/yourusername/hello. The file name is case sensitive, so make sure you use all lowercase letters.

Running Your First Program

The final step is to run your program. It is possible to run some Python programs from within IDLE, but you should run the programs associated with this booksite directly from a Terminal window. To do that, perform these steps:

• Within the same Terminal window, issue the ls command to display the names of all files in the working directory. Confirm that the working directory contains your helloworld.py file.

• Issue the python3 helloworld.py command to run your program. If the computer writes 'Hello, World' to the Terminal window, then the execution of your helloworld.py program was successful. Snippetslab 1 8 4 cm. If the computer instead writes error messages, then use IDLE to correct your program, and issue the python3 helloworld.py command again. Repeat until your program runs successfully. If your program runs successfully the first time you try, then intentionally introduce an error into your program, just so you get some experience with correcting errors.

• Close the IDLE window.

• Close the Terminal window.

You now have installed and configured a reasonable Python environment, and have used it to compose and run a Python program. Congratulations! You are a Python programmer!

Downloading the Booksite Example Programs (optional)

We recommend that you download the booksite example programs, that is, the example Python programs that are presented incrementally throughout the booksite. Having done so, you can run those programs to help you learn about them. Perform these instructions:

• Use your Web browser to download this introcs-python.zip file to your /Users/yourusername/Downloads directory.

• In the Mac Finder, double-click on /Users/yourusername/Downloads/introcs-python.zip to unzip the file, thus creating the /Users/yourusername/Downloads/introcs-python directory containing the booksite example programs. (It's OK to delete the /Users/yourusername/Downloads/introcs-python.zip file after you have unzipped it.)

Then perform these steps to test your download of the booksite example programs:

• Open a Terminal window.

• Issue the cd Downloads and cd introcs-python commands to make /Users/yourusername/Downloads/introcs-python your working directory.

• Issue the ls command. Confirm that the working directory contains a file named bouncingball.py.

• Issue the python3 bouncingball.py command. If Python launches a stddraw window showing an animated bouncing ball, then your download of the booksite example programs was successful.

• Close the stddraw window.

• Close the Terminal window.

Downloading the Booksite Example Data (optional)

We recommend that you download the booksite example data, that is, the data files used by the booksite example programs that are presented incrementally throughout the booksite. Perform these instructions:

• Use your Web browser to download this introcs-data.zip file to your /Users/yourusername/Downloads directory.

• In the Finder, double-click on /Users/yourusername/Downloads/introcs-data.zip to unzip the file, thus creating the /Users/yourusername/Downloads/introcs-data directory containing the booksite example data files. (It's OK to delete the /Users/yourusername/Downloads/introcs-data.zip file after you have unzipped it.)

Downloading the Booksite Library: Part 2 (optional)

Previously on this page we described how to download and install the booksite library so Python can find it. Now we describe how to download the booksite library so you can find it — for the sake of studying the code that implements it, should you so desire. Perform these instructions:

• Use your Web browser to download this stdlib-python.zip file to your /Users/yourusername/Downloads directory.

• In the Mac Finder, double-click on /Users/yourusername/Downloads/stdlib-python.zip to unzip the file, thus creating the /Users/yourusername/Downloads/stdlib-python directory containing the booksite library. (It's OK to delete the /Users/yourusername/Downloads/stdlib-python.zip file after you have unzipped it.)

We invite you to study the code that implements the booksite library. But don't be concerned if some of the code is cryptic. The code that implements the booksite library uses some features of Python that are beyond the scope of the textbook and this booksite.

Q & A

Q. Why do I get the error ImportError: No module named stdio when I issue the command python program_that_uses_stdio.py?

Declutter 2019 minimalist. A. You must issue the command python3 program_that_uses_stdio.py, as described above.

Q. I downloaded files using my browser, but can't find them. Where are they?

A. Many browsers by default place downloaded files in the directory /Users/yourusername/Downloads.

Q. How do I break out of an infinite loop when running my program from the Terminal application?

A. Type Ctrl-c. That is, while pressing the Ctrl key, type the c key.

Q. Must I use IDLE to create my Python programs? Can I use some other text editor?

A. You need not use IDLE to create your Python programs; it is fine to use some other text editor. For example, it is reasonable to use the TextEdit editor that is bundled with Mac OS X. However if you do use some other text editor, then make sure you change its settings so it (1) uses a four-space indentation scheme, and (2) indents using spaces instead of tabs. The Wikipedia Comparison of text editors page provides summary descriptions of many text editors.

When you get a brand-new Mac, you might assume it's loaded up with brand-new software. And for most apps, you'd be right. For underlying frameworks, however, it's a different story. Brand-new Macs fresh from the factory floor still ship with Python 2.7.10, even though the most recent stable release is Python 3.6.1. This might seem like a pretty significant gap between versions, and that's because it is. But newer isn't always better. Python 2 is still the default language, but that's likely to change in the coming years.

2to3 or not 2to3?

It's natural think that Python 3 is better because it's newer. They wouldn't be totally wrong: Python 3 includes some cool new features that Python 2 lacks. However, alongside those new features, Python 3 also has a problem. It's not backwards compatible with Python 2. That means that programs written for a Python 2 interpreter won't run on a Python 3 interpreter. Even fundamental commands like print and integer comparison work differently between Python 2 and 3, complicating the process of moving from one language to another. You can check out a list of the most significant changes on the Python 3.0 documentation.

But why hasn't the whole world switched over to Python 3? The main problem is that there's a lack of compelling motivation. Python 2 is a strong language, and only power users will get to experience the full benefit of Python 3's new features. Plus, Python 2.7.10 is pre-installed on all Macs and a number of Linux distros. With the significant differences between the two versions and the work required to convert from 2 to 3, it's hard to find strong reasons to move Python 2 apps to Python 3. It's true that utilities like 2to3 make it easier to transform a Python 2 program into valid Python 3 syntax, but if you've ever used Google Translate, you know this won't be perfect.

Unfortunately, Python 2 isn't going to be around forever. The developers have set 2020 as the final year for Python 2 support, and everyone will need to transition their programs over to Python 3 by then. If you're writing new programs in Python, you might be interested in starting to use Python 3. But first, you'll need to install a Python 3 interpreter on your Mac.

Upgrading to Python 3 on your Mac

Even if it isn't the de facto standard, you can run Python 3 on your Mac today. You can even run it alongside a concurrent Python 2.7 installation without affecting the version 2.7 installation.

1. Download the most recent package from the Python website.

2. Double-click the downloaded package and run the Python installer.

3. Once the installer is finished, you'll find a new Python 3.6.1 folder inside of the Applications directory. The installer also installed the Python interpreter and binaries in your /usr/local/bin folder.

4. This folder contains a GUI for launching Python applications called Python Launcher. It also includes IDLE, an IDE for developing Python applications, a link to Python's documentation and miscellaneous documents.

Launching Python 3 from the Terminal

1. If you want to run a Python 3 script or application from the command line, you'll need to use the command python3. Notice the difference when compared to the python command, which runs Python 2.7. If you end up using Python 3 as your primary interpreter, you can change this alias, but python3 is the default.

2. Without additional arguments, the python3 command will invoke the Python 3 interactive interpreter. This allows you to type Python 3 code into the Terminal and run it on a line-by-line basis.

3. If you do something a little more useful and run a script with the Python 3 interpreter, follow the python3 command with the path to your .py file.

Python 3 Machine Learning Lottery

Launching Python 3 from the GUI

You can also run Python 3 programs from the Python Launcher GUI.

1. Open the Python Launcher found in '/Applications/Python 3.6.1.' (Note that the version number in the Python folder's name will change with future versions of Python. Just look for the one that starts with a 3.)

2. This opens the Preferences window for the launcher. The application is set to run everything with a Python 2 interpreter by default, but we can change that. Change the path under 'Interpreter' to '/usr/local/bin/python3', which is the default directory of the Python 3 interpreter.

3. Chose 'File > Open…' from the menu bar. Then, select the Python program you want to run.

4. The selected program will now run. GUI programs will launch their visual interface, and scripts will run in the Terminal window.

You can also run Python programs with the GUI by adding the Python launcher icon to your Dock and dragging Python scripts on top of it.

Conclusion

Getting Python 3 running on your Mac ins't hard. However, changing your coding habits can take some time. If you've been writing Python 2 for a while now, switching to Python 3 can be a tedious and frustrating process. You'll have to update your knowledge eventually, however, so you may as well get started now, while you've got a couple of years ahead of you.

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