Support for Python 3

[cclauss]

See #1150, #1335, #1336, and https://travis-ci.com/nodejs/node/builds/79706150 (nodejs/node#21942)

• Node Version:
• Platform:
• Compiler:
• Module:

Verbose output (from npm or node-gyp):

[richardlau]

Historically the blocker to this has been the gyp dependency and normally changes should be upstreamed there unless we're planning on forking gyp in which case we would want our own gyp project so that we can share the changes with the main Node.js project.

cc @nodejs/gyp

[mthacker801]

I cannot successfully install Angular on my mac. I keep getting gyp error and when I look at gyp-mac-tool it says:
gyp verb command configure []
gyp verb check python checking for Python executable "python2" in the PATH
gyp verb which failed Error: not found: python2
gyp verb which failed at getNotFoundError (/Users/thackerfam/AngularProj/angular-cli/node_modules/which/which.js:13:12)

I have had python 3 installed forever and do not want python 2 as it can cause havoc to have both installed as they are not compatible with one another. If this is the reason for my inability to use Angular, what should I do?

[cclauss]

On your Mac, what happens when you do:

• python2 --version
• /usr/bin/python --version
• /usr/bin/python2 --version
• /usr/bin/python2.7 --version

I would highly recommend Homebrew as essential if you are doing real development on a Mac.

Brew allows you to easily install both Python 2 and Python3 with: brew install python python@2

[cclauss]

A few Python 2 issues on gyp:

$ python2 -m flake8 . --count --select=E901,E999,F821,F822,F823 --show-source --statistics

./gyptest.py:61:47: F821 undefined name 'opts'
    extra_path = [os.path.abspath(p) for p in opts.path]  # <-- 'opts' should be changed to 'args'
                                              ^
./pylib/gyp/generator/make.py:1637:50: F821 undefined name 'target'
      print "WARNING: no output for", self.type, target  # <-- 'target' should be changes to 'self.target'
                                                 ^

[SatishMHiremath]

I have faced and fixed this issue relates node-sass and python error.Try installing latest angular cli command with the steps below

Set the system variable path as well:
C:\Users\windowsusername\AppData\Roaming\npm

C:\Users\windowsusername\AppData\Roaming\npm\node_modules@angular\cli\bin;

C:\Program Files\nodejs;

Then start using angular cli command prompt using:
angular client project folder path>npm install -g @latest

angular client project folder path>npm install -g node-gyp

[stanleyxu2005]

It's a bit embraced that the original gyp project relies on python 2, and after couple of years, the patch is getting too big so that no people is dare to review and merge it. Need to give the gyp community more feedback to move this forward.

[AdamMajer]

Is there any interest in this? Python 2 is starting to get removed from distributions at this point.

[timoxley]

Python 2 is starting to get removed from distributions at this point.

Correct e.g. brew is now installing/upgrading to Python 3 by default.

The following just worked for me as I already had a python2.7 executable installed via brew:

npm config set python python2.7

However, if you don't have a python2.7 executable, I suspect you can do something like:

brew install python@2
# follow the instructions printed after installing `python@2` to get python 2 on your PATH 
# e.g. echo 'export PATH="/usr/local/opt/python@2/bin:$PATH"' >> ~/.bashrc
npm config set python python2.7

[NetOpWibby]

Tim's method should go in the README. I use ZSH and there was a message mentioned Xcode when I installed Python 2 so my process was as follows:

xcode-select --install

brew install python@2
echo 'export PATH="/usr/local/opt/python@2/bin:$PATH"' >> ~/.zshrc
npm config set python python2.7

[ioquatix]

For some reason, npm config set python python2.7 stopped working for me. Even after setting it, I get the error that node-gyp is trying to run python 3.6

[cclauss]

What does python2.7 --version return on your machine?