Fix conda instructions (#4884)

* Fix conda instructions

* New idea

* fix to have conda avoid -r in requirements.txt and avoid ~=2.12 which is pip specific

* Hopefully fix macos pypy loading

* try again without wheel?

* Avoid dependencies on PyPy

Co-authored-by: Dan Schult <dschult@colgate.edu>

5 files changed, 19 insertions, 10 deletions

diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 0d1d5f93..bf998628 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -48,8 +48,8 @@ jobs:
     - name: Install packages
       run: |
         pip install --upgrade pip wheel setuptools
-        pip install -r requirements.txt
-        pip install .
+        pip install -r requirements/test.txt
+        pip install decorator . --no-deps
         pip list
 
     - name: Test NetworkX
diff --git a/CONTRIBUTING.rst b/CONTRIBUTING.rst
index d15747e1..4ad61d8c 100644
--- a/CONTRIBUTING.rst
+++ b/CONTRIBUTING.rst
@@ -45,7 +45,7 @@ Development Workflow
          # Activate it
          source networkx-dev/bin/activate
          # Install main development and runtime dependencies of networkx
-         pip install -r <(cat requirements/{default,developer,test}.txt)
+         pip install -r requirements.txt -r requirements/developer.txt
          #
          # (Optional) Install pygraphviz, pydot, and gdal packages
          # These packages require that you have your system properly configured
@@ -66,12 +66,12 @@ Development Workflow
          # Activate it
          conda activate networkx-dev
          # Install main development and runtime dependencies of networkx
-         conda install -c conda-forge `for i in requirements/{default,developer,test}.txt; do echo -n " --file $i "; done`
+         conda install -c conda-forge --file requirements/default.txt --file requirements/test.txt --file requirements/developer.txt
          #
          # (Optional) Install pygraphviz, pydot, and gdal packages
          # These packages require that you have your system properly configured
          # and what that involves differs on various systems.
-         # pip install -r requirements/extra.txt
+         # conda install -c conda-forge --file requirements/extra.txt
          #
          # Install networkx from source
          pip install -e . --no-deps
diff --git a/INSTALL.rst b/INSTALL.rst
index 62033f1d..b9d85e40 100644
--- a/INSTALL.rst
+++ b/INSTALL.rst
@@ -32,6 +32,15 @@ install into your user directory using the ``--user`` flag::
 
     $ pip install --user networkx
 
+If you do not want to install our dependencies (e.g., ``numpy``, ``scipy``, etc.),
+you can use::
+
+    $ pip install decorator networkx --no-deps
+
+This may be helpful if you are using PyPy or you are working on a project that
+only needs a limited subset of our functionality and you want to limit the
+number of dependencies.
+
 Alternatively, you can manually download ``networkx`` from
 `GitHub <https://github.com/networkx/networkx/releases>`_  or
 `PyPI <https://pypi.python.org/pypi/networkx>`_.
diff --git a/requirements/default.txt b/requirements/default.txt
index 5c78e7c1..c404b5e8 100644
--- a/requirements/default.txt
+++ b/requirements/default.txt
@@ -1,5 +1,5 @@
 decorator>=5.0.7,<6
-numpy>=1.19; platform_python_implementation!='PyPy' and python_version<'3.10'
-scipy>=1.5,!=1.6.1; platform_python_implementation!='PyPy' and python_version<'3.10'
-matplotlib>=3.3; platform_python_implementation!='PyPy' and python_version<'3.10'
-pandas>=1.1; platform_python_implementation!='PyPy' and python_version<'3.10'
+numpy>=1.19
+scipy>=1.5,!=1.6.1
+matplotlib>=3.3
+pandas>=1.1
diff --git a/requirements/developer.txt b/requirements/developer.txt
index 63f5dff3..efc4154b 100644
--- a/requirements/developer.txt
+++ b/requirements/developer.txt
@@ -1,2 +1,2 @@
 black==21.5b1
-pre-commit~=2.12
+pre-commit>=2.12