fix: `from pysr import *`

pysr/__init__.py

@@ -18,7 +18,6 @@ __all__ = [
     "sklearn_monkeypatch",
     "sympy2jax",
     "sympy2torch",
-    "Problem",
     "install",
     "PySRRegressor",
     "best",

pysr/test/test.py

@@ -1,3 +1,4 @@
+import importlib
 import os
 import pickle as pkl
 import tempfile
@@ -907,6 +908,14 @@ class TestHelpMessages(unittest.TestCase):
 
         self.assertIn("`unary_operators`, `binary_operators`", str(cm.exception))
 
+    def test_issue_666(self):
+        # Try the equivalent of `from pysr import *`
+        pysr_module = importlib.import_module("pysr")
+        names_to_import = pysr_module.__all__
+
+        for name in names_to_import:
+            getattr(pysr_module, name)
+
 
 TRUE_PREAMBLE = "\n".join(
     [