GitHub Actions: do not install six in CI (#37361)

* GitHub Actions: do not install six in CI
* Remove workflow code that was commented out
* Remove any use of "six" from packages

9 files changed, 19 insertions, 104 deletions

diff --git a/.github/workflows/audit.yaml b/.github/workflows/audit.yaml
index 062e91b0f7..bdff71220b 100644
--- a/.github/workflows/audit.yaml
+++ b/.github/workflows/audit.yaml
@@ -25,7 +25,7 @@ jobs:
         python-version: ${{inputs.python_version}}
     - name: Install Python packages
       run: |
-        pip install --upgrade pip six setuptools pytest coverage[toml]
+        pip install --upgrade pip setuptools pytest coverage[toml]
     - name: Package audits (with coverage)
       if: ${{ inputs.with_coverage == 'true' }}
       run: |
diff --git a/.github/workflows/unit_tests.yaml b/.github/workflows/unit_tests.yaml
index 628cab9749..3a37dc7984 100644
--- a/.github/workflows/unit_tests.yaml
+++ b/.github/workflows/unit_tests.yaml
@@ -62,7 +62,7 @@ jobs:
               cmake bison libbison-dev kcov
     - name: Install Python packages
       run: |
-          pip install --upgrade pip six setuptools pytest pytest-xdist pytest-cov
+          pip install --upgrade pip setuptools pytest pytest-xdist pytest-cov
           pip install --upgrade flake8 "isort>=4.3.5" "mypy>=0.900" "click" "black"
     - name: Setup git configuration
       run: |
@@ -107,7 +107,7 @@ jobs:
           sudo apt-get install -y coreutils kcov csh zsh tcsh fish dash bash
     - name: Install Python packages
       run: |
-          pip install --upgrade pip six setuptools pytest coverage[toml] pytest-xdist
+          pip install --upgrade pip setuptools pytest coverage[toml] pytest-xdist
     - name: Setup git configuration
       run: |
           # Need this for the git tests to succeed.
@@ -163,7 +163,7 @@ jobs:
           sudo apt-get -y install coreutils cvs gfortran graphviz gnupg2 mercurial ninja-build kcov
     - name: Install Python packages
       run: |
-          pip install --upgrade pip six setuptools pytest coverage[toml] pytest-cov clingo pytest-xdist
+          pip install --upgrade pip setuptools pytest coverage[toml] pytest-cov clingo pytest-xdist
     - name: Setup git configuration
       run: |
           # Need this for the git tests to succeed.
@@ -193,7 +193,7 @@ jobs:
         python-version: ${{ matrix.python-version }}
     - name: Install Python packages
       run: |
-          pip install --upgrade pip six setuptools
+          pip install --upgrade pip setuptools
           pip install --upgrade pytest coverage[toml] pytest-xdist pytest-cov
     - name: Setup Homebrew packages
       run: |
diff --git a/.github/workflows/valid-style.yml b/.github/workflows/valid-style.yml
index 573330bc37..085f7fab60 100644
--- a/.github/workflows/valid-style.yml
+++ b/.github/workflows/valid-style.yml
@@ -44,7 +44,7 @@ jobs:
         cache: 'pip'
     - name: Install Python packages
       run: |
-        python3 -m pip install --upgrade pip six setuptools types-six black==23.1.0 mypy isort clingo flake8
+        python3 -m pip install --upgrade pip setuptools types-six black==23.1.0 mypy isort clingo flake8
     - name: Setup git configuration
       run: |
         # Need this for the git tests to succeed.
diff --git a/.github/workflows/windows_python.yml b/.github/workflows/windows_python.yml
index 92ac3b2f52..33c2d17db5 100644
--- a/.github/workflows/windows_python.yml
+++ b/.github/workflows/windows_python.yml
@@ -23,7 +23,7 @@ jobs:
         python-version: 3.9
     - name: Install Python packages
       run: |
-          python -m pip install --upgrade pip six pywin32 setuptools pytest-cov clingo
+          python -m pip install --upgrade pip pywin32 setuptools pytest-cov clingo
     - name: Create local develop
       run: |
         ./.github/workflows/setup_git.ps1
@@ -47,7 +47,7 @@ jobs:
         python-version: 3.9
     - name: Install Python packages
       run: |
-          python -m pip install --upgrade pip six pywin32 setuptools coverage pytest-cov clingo
+          python -m pip install --upgrade pip pywin32 setuptools coverage pytest-cov clingo
     - name: Create local develop
       run: |
         ./.github/workflows/setup_git.ps1
@@ -71,85 +71,10 @@ jobs:
         python-version: 3.9
     - name: Install Python packages
       run: |
-          python -m pip install --upgrade pip six pywin32 setuptools coverage
+          python -m pip install --upgrade pip pywin32 setuptools coverage
     - name: Build Test
       run: |
         spack compiler find
         spack external find cmake
         spack external find ninja
         spack -d install abseil-cpp
-  # TODO: johnwparent - reduce the size of the installer operations
-  # make-installer:
-  #   runs-on: windows-latest
-  #   steps:
-  #   - name: Disable Windows Symlinks
-  #     run: |
-  #       git config --global core.symlinks false
-  #     shell:
-  #       powershell
-  #   - uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab
-  #     with:
-  #       fetch-depth: 0
-  #   - uses: actions/setup-python@57ded4d7d5e986d7296eab16560982c6dd7c923b
-  #     with:
-  #       python-version: 3.9
-  #   - name: Install Python packages
-  #     run: |
-  #         python -m pip install --upgrade pip six pywin32 setuptools
-  #   - name: Add Light and Candle to Path
-  #     run: |
-  #       $env:WIX >> $GITHUB_PATH
-  #   - name: Run Installer
-  #     run: |
-  #       ./share/spack/qa/setup_spack_installer.ps1
-  #       spack make-installer -s . -g SILENT pkg
-  #       echo "installer_root=$((pwd).Path)" | Out-File -FilePath $Env:GITHUB_ENV -Encoding utf8 -Append
-  #     env:
-  #       ProgressPreference: SilentlyContinue
-  #   - uses: actions/upload-artifact@83fd05a356d7e2593de66fc9913b3002723633cb
-  #     with:
-  #       name: Windows Spack Installer Bundle
-  #       path: ${{ env.installer_root }}\pkg\Spack.exe
-  #   - uses: actions/upload-artifact@83fd05a356d7e2593de66fc9913b3002723633cb
-  #     with:
-  #       name: Windows Spack Installer
-  #       path: ${{ env.installer_root}}\pkg\Spack.msi
-  # execute-installer:
-  #   needs: make-installer
-  #   runs-on: windows-latest
-  #   defaults:
-  #     run:
-  #       shell: pwsh
-  #   steps:
-  #   - uses: actions/setup-python@57ded4d7d5e986d7296eab16560982c6dd7c923b
-  #     with:
-  #       python-version: 3.9
-  #   - name: Install Python packages
-  #     run: |
-  #         python -m pip install --upgrade pip six pywin32 setuptools
-  #   - name: Setup installer directory
-  #     run: |
-  #       mkdir -p spack_installer
-  #       echo "spack_installer=$((pwd).Path)\spack_installer" | Out-File -FilePath $Env:GITHUB_ENV -Encoding utf8 -Append
-  #   - uses: actions/download-artifact@v3
-  #     with:
-  #       name: Windows Spack Installer Bundle
-  #       path: ${{ env.spack_installer }}
-  #   - name: Execute Bundled Installer
-  #     run: |
-  #       $proc = Start-Process  ${{ env.spack_installer }}\spack.exe "/install /quiet" -Passthru
-  #       $handle = $proc.Handle # cache proc.Handle
-  #       $proc.WaitForExit();
-  #       $LASTEXITCODE
-  #     env:
-  #       ProgressPreference: SilentlyContinue
-  #   - uses: actions/download-artifact@v3
-  #     with:
-  #       name: Windows Spack Installer
-  #       path: ${{ env.spack_installer }}
-  #   - name: Execute MSI
-  #     run: |
-  #       $proc = Start-Process  ${{ env.spack_installer }}\spack.msi "/quiet" -Passthru
-  #       $handle = $proc.Handle # cache proc.Handle
-  #       $proc.WaitForExit();
-  #       $LASTEXITCODE
diff --git a/var/spack/repos/builtin.mock/packages/multimethod/package.py b/var/spack/repos/builtin.mock/packages/multimethod/package.py
index d28b44c7fd..2853b87284 100644
--- a/var/spack/repos/builtin.mock/packages/multimethod/package.py
+++ b/var/spack/repos/builtin.mock/packages/multimethod/package.py
@@ -3,8 +3,6 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
-from six import string_types
-
 import spack.platforms
 from spack.package import *
 from spack.pkg.builtin.mock.multimethod_base import MultimethodBase
@@ -102,7 +100,7 @@ class Multimethod(MultimethodBase):
 
         @when("target=" + target.name)
         def different_by_target(self):
-            if isinstance(self.spec.architecture.target, string_types):
+            if isinstance(self.spec.architecture.target, str):
                 return self.spec.architecture.target
             else:
                 return self.spec.architecture.target.name
diff --git a/var/spack/repos/builtin.mock/packages/raiser/package.py b/var/spack/repos/builtin.mock/packages/raiser/package.py
index b80f0a579a..b9e68fa11d 100644
--- a/var/spack/repos/builtin.mock/packages/raiser/package.py
+++ b/var/spack/repos/builtin.mock/packages/raiser/package.py
@@ -3,7 +3,7 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
-from six.moves import builtins
+import builtins
 
 from spack.package import *
 
diff --git a/var/spack/repos/builtin/packages/dataspaces/package.py b/var/spack/repos/builtin/packages/dataspaces/package.py
index 91368a2c15..d19e0f30d8 100644
--- a/var/spack/repos/builtin/packages/dataspaces/package.py
+++ b/var/spack/repos/builtin/packages/dataspaces/package.py
@@ -2,16 +2,13 @@
 # Spack Project Developers. See the top-level COPYRIGHT file for details.
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
-
-import six
-
 from spack.package import *
 
 
 def is_string(x):
     """validate a string"""
     try:
-        return isinstance(x, six.string_types)
+        return isinstance(x, str)
     except ValueError:
         return False
 
diff --git a/var/spack/repos/builtin/packages/pythia6/package.py b/var/spack/repos/builtin/packages/pythia6/package.py
index 435e86f01c..497f926673 100644
--- a/var/spack/repos/builtin/packages/pythia6/package.py
+++ b/var/spack/repos/builtin/packages/pythia6/package.py
@@ -2,12 +2,9 @@
 # Spack Project Developers. See the top-level COPYRIGHT file for details.
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
-
 import numbers
 import os
-
-from six import iteritems
-from six.moves.urllib.parse import urlparse
+import urllib.parse
 
 from spack.package import *
 
@@ -97,7 +94,7 @@ class Pythia6(CMakePackage):
         "ttbar.lhe": "db772b69ab4e0300d973b57414523ac8e7fa8535eac49ee52a6b69b1c131983d",
     }
 
-    for example, checksum in iteritems(examples):
+    for example, checksum in examples.items():
         resource(
             name=example,
             url="http://pythiasix.hepforge.org/examples/{0}".format(example),
@@ -114,8 +111,8 @@ class Pythia6(CMakePackage):
         "https://pythiasix.hepforge.org/pythia6-announcement.txt": "2a52def41f0c93e32e0db58dbcf072b987ebfbd32e42ccfc1f9382fcf65f1271",
     }
 
-    for docurl, checksum in iteritems(docs):
-        doc = os.path.basename(urlparse(docurl).path)
+    for docurl, checksum in docs.items():
+        doc = os.path.basename(urllib.parse.urlparse(docurl).path)
         resource(
             name=doc,
             url=docurl,
diff --git a/var/spack/repos/builtin/packages/rust/package.py b/var/spack/repos/builtin/packages/rust/package.py
index 2fa16ff3bc..aec30c1118 100644
--- a/var/spack/repos/builtin/packages/rust/package.py
+++ b/var/spack/repos/builtin/packages/rust/package.py
@@ -5,8 +5,6 @@
 
 import re
 
-from six import iteritems
-
 from spack.package import *
 
 
@@ -197,7 +195,7 @@ class Rust(Package):
     rust_prerelease_versions = ["beta", "nightly", "master"]
 
     for prerelease_version in rust_prerelease_versions:
-        for rust_target, rust_arch_list in iteritems(rust_archs):
+        for rust_target, rust_arch_list in rust_archs.items():
             for rust_arch in rust_arch_list:
                 # All pre-release builds are built with the latest beta
                 # compiler.
@@ -226,8 +224,8 @@ class Rust(Package):
     # _host_ architecture, not the target architecture, in order to support
     # cross compiling. I'm not sure Spack provides a way to specify a
     # distinction in the when clause, though.
-    for rust_version, rust_targets in iteritems(rust_releases):
-        for rust_target, rust_sha256 in iteritems(rust_targets):
+    for rust_version, rust_targets in rust_releases.items():
+        for rust_target, rust_sha256 in rust_targets.items():
             for rust_arch in rust_archs[rust_target]:
                 resource(
                     name="rust-{version}-{target}".format(