Add Python 3.13 and fix issues with imports in __init__.py

.github/workflows/github-ci.yml

@@ -39,7 +39,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "pypy3.9-v7.3.15"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13", "pypy3.9-v7.3.15"]
         os: [macos-11, macos-12, ubuntu-20.04, ubuntu-22.04, windows-2019, windows-2022]
         exclude:
           # temporarily exclude pypy3 on mac-os as there failing tests caused by bug on cbc side

mip/__init__.py

@@ -6,7 +6,14 @@
 from mip.exceptions import *
 from mip.ndarray import LinExprTensor
 from mip.entities import Column, Constr, LinExpr, Var, ConflictGraph
-from mip.model import *
+from mip.model import (
+    Model,
+    maximize,
+    minimize,
+    xsum,
+    save_mipstart,
+    load_mipstart,
+)
 
 try:
     from ._version import __version__

pyproject.toml

@@ -6,7 +6,7 @@ build-backend = "setuptools.build_meta"
 name = "mip"
 description = "Python tools for Modeling and Solving Mixed-Integer Linear Programs (MIPs)"
 readme = "README.md"
-requires-python = ">=3.7,<3.13"
+requires-python = ">=3.7,<3.14"
 license = {file = "LICENSE"}
 authors = [
     {name="Tulio A.M. Toffolo", email="tulio@toffolo.com.br"},
@@ -38,7 +38,7 @@ numpy = [
     "numpy==1.21.*; python_version=='3.7'"
 ]
 gurobi = ["gurobipy>=8"]
-highs = ["highspy>=1.5.3; python_version<='3.11'"]
+highs = ["highspy>=1.5.3; python_version<='3.13'"]
 test = [
     "pytest>=7.4",
     "networkx==2.8.8; python_version>='3.8'",