chore: Update to Cython3

  As hoped, this upgrade significantly simplifies the install-requirements.sh
  script. Provides additional progress on numberscope#43.
  Note this must be tested with care (additional details in PR).
  Resolves numberscope#82.

README.md

@@ -18,6 +18,10 @@ disruptive and wastefully repetitive if performed in each visitor's browser.
 
 ## Quick start
 
+(Note there are also much more detailed, step-by-step instructions for
+[installing backscope on Ubuntu](doc/install-ubuntu.md), which can perhaps
+also be tailored to other Linux distributions or other operating systems.)
+
 1. Install Git if need be and clone this repo from
    `github.com/numberscope/backscope`. Switch to the top-level directory
    of the clone.
@@ -28,10 +32,7 @@ disruptive and wastefully repetitive if performed in each visitor's browser.
      need to install a package like "libpari-dev" on Ubuntu)
    + The GNU multi-precision arithmetic dev package
    + A C compiler and C build tools.
-   See also detailed instructions for
-   [installing backscope on Ubuntu](doc/install-ubuntu.md), which can
-   perhaps as well be tailored to other Linux distributions or other
-   operating systems.
+   See also the detailed Ubuntu instructions linked above.
 3. Create a virtual environment, e.g., `python -m venv .venv`.
 4. Activate the virtual environment, e.g., `source .venv/bin/activate`.
 5. Install Python dependencies: `sh tools/install-requirements.sh`.

requirements-freeze.txt

@@ -4,8 +4,8 @@ certifi==2023.7.22
 charset-normalizer==2.1.1
 click==8.1.7
 cypari2==2.1.3
-cysignals==1.11.2
-Cython==0.29.36
+cysignals==1.11.4
+Cython==3.0.4
 Flask==3.0.0
 Flask-Cors==3.0.10
 Flask-Executor==1.0.0
@@ -21,7 +21,7 @@ jsonify==0.5
 Mako==1.2.2
 MarkupSafe==2.1.3
 numpy==1.23.2
-psycopg2-binary==2.9.7
+psycopg2-binary==2.9.9
 python-dateutil==2.8.2
 python-dotenv==0.20.0
 python-editor==1.0.4

tools/install-requirements.sh

@@ -4,15 +4,6 @@ NOV='No Python virtual environment active, exiting...'
 if python -c "$INVENV"; then echo "$HASV"; else echo "$NOV"; exit 1; fi
 
 if ! pip install --upgrade pip; then echo "pip failed"; exit 1; fi
-if ! (pip install wheel==0.41.2 && pip install Cython==0.29.36)
-then echo "Install failure (wheel or Cython)"; exit 1
-fi
-if ! (pip install cysignals==1.11.2 && pip install cypari2==2.1.3)
-then echo "Install failure (cysignals or cypari2)"; exit 1
-fi 
-if ! (pip install psycopg2-binary==2.9.7)
-then echo "Failed to install psycopg2-binary"; exit 1
-fi 
 if ! pip install -r requirements-freeze.txt;
 then echo "Failed to install remaining requirements"; exit 1
 fi