take out python 3.7, use numpy<2

.github/workflows/pythonpackage.yml

@@ -8,11 +8,9 @@ jobs:
     strategy:
       max-parallel: 21
       matrix:
-        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11', '3.12']
+        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12']
         os: [ubuntu-latest, macOS-latest, windows-latest]
         exclude:
-          - os: macOS-latest
-            python-version: '3.7'
           - os: macOS-latest
             python-version: '3.8'
 
@@ -26,29 +24,28 @@ jobs:
         run: |
           python -m pip install --upgrade pip
       - name: Code Quality
-        if: matrix.python-version != '3.7'
         run: |
-          pip install black
+          python -m pip install black
           black pulp/ --check
       - name: Install dependencies
         run: |
-          pip install .
+          python -m pip install .
       - name: install glpk
         if: matrix.os == 'ubuntu-latest'
         run: |
           sudo apt-get update -qq
           sudo apt-get install -qq glpk-utils
       - name: install xpress
         if: matrix.os != 'macOS-latest' && matrix.python-version != '3.12'
-        run: pip install xpress
+        run: python -m pip install xpress
       - name: Install gurobipy
         run: |
           python -m pip install gurobipy
       - name: Install highspy
         if: matrix.python-version != '3.12'
-        # alternatively if: contains(fromJSON("['3.7', '3.8', '3.9', '3.10', '3.11']"), matrix.python-version)
+        # alternatively if: contains(fromJSON("['3.8', '3.9', '3.10', '3.11']"), matrix.python-version)
         run: |
-          pip install highspy numpy
+          python -m pip install highspy "numpy<2"
       - name: Install highspy cmd
         if: matrix.os == 'ubuntu-latest'
         uses: supplypike/setup-bin@v4
@@ -59,12 +56,12 @@ jobs:
           version: '1.7.1'
       - name: Install coptpy
         run: |
-          pip install coptpy
+          python -m pip install coptpy
       - name: Install saspy
         run: |
-          pip install saspy
+          python -m pip install saspy
       - name: Install swat
         run: |
-          pip install swat
+          python -m pip install swat
       - name: Test with pulptest
         run: pulptest

pulp/apis/__init__.py

@@ -125,6 +125,7 @@ def getSolverFromDict(data):
     :raises PulpSolverError: if the dictionary does not have the "solver" key
     :rtype: LpSolver
     """
+    data = dict(data)
     solver = data.pop("solver", None)
     if solver is None:
         raise PulpSolverError("The json file has no solver attribute.")