diff --git a/.github/workflows/macos.yml b/.github/workflows/macos.yml
index 5bdcf7d0e..936886042 100644
--- a/.github/workflows/macos.yml
+++ b/.github/workflows/macos.yml
@@ -15,7 +15,7 @@ jobs:
     strategy:
       matrix:
         os: [macOS]
-        python-version: ['3.10', '3.11']
+        python-version: ['3.13', '3.12']
     steps:
     - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}
diff --git a/.github/workflows/ubuntu.yml b/.github/workflows/ubuntu.yml
index d886d5b64..ee770cba9 100644
--- a/.github/workflows/ubuntu.yml
+++ b/.github/workflows/ubuntu.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.12', '3.11', '3.8', '3.9', '3.10']
+        python-version: ['3.13', '3.12', '3.11', '3.10', '3.9']
     steps:
     - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}
diff --git a/mathics/builtin/files_io/importexport.py b/mathics/builtin/files_io/importexport.py
index e91f20179..9b0033230 100644
--- a/mathics/builtin/files_io/importexport.py
+++ b/mathics/builtin/files_io/importexport.py
@@ -1060,16 +1060,16 @@ class RegisterImport(Builtin):
     >> FilePrint["ExampleData/ExampleData.txt"]
      | Example File Format
      | Created by Angus
-     | 0.629452	0.586355
-     | 0.711009	0.687453
-     | 0.246540	0.433973
-     | 0.926871	0.887255
-     | 0.825141	0.940900
-     | 0.847035	0.127464
-     | 0.054348	0.296494
-     | 0.838545	0.247025
-     | 0.838697	0.436220
-     | 0.309496	0.833591
+     | 0.629452    0.586355
+     | 0.711009    0.687453
+     | 0.246540    0.433973
+     | 0.926871    0.887255
+     | 0.825141    0.940900
+     | 0.847035    0.127464
+     | 0.054348    0.296494
+     | 0.838545    0.247025
+     | 0.838697    0.436220
+     | 0.309496    0.833591
 
     >> Import["ExampleData/ExampleData.txt", {"ExampleFormat1", "Elements"}]
      = {Data, Header}
diff --git a/mathics/core/builtin.py b/mathics/core/builtin.py
index 269300b2d..4450f70bb 100644
--- a/mathics/core/builtin.py
+++ b/mathics/core/builtin.py
@@ -468,6 +468,8 @@ def get_functions(self, prefix="eval", is_pymodule=False):
         for name in dir(self):
             if name.startswith(prefix):
                 function = getattr(self, name)
+                if not hasattr(function, "__call__"):
+                    continue
                 pattern = function.__doc__
                 if pattern is None:  # Fixes PyPy bug
                     continue
diff --git a/mathics/doc/doc_entries.py b/mathics/doc/doc_entries.py
index 201d4ae19..e91d88af7 100644
--- a/mathics/doc/doc_entries.py
+++ b/mathics/doc/doc_entries.py
@@ -93,7 +93,7 @@
     r"""(?mx)^  # re.MULTILINE (multi-line match)
                 # and re.VERBOSE (readable regular expressions
         ((?:.|\n)*?)
-        ^\s+([>#SX])>[ ](.*)  # test-code indicator
+        ^\s*([>#SX])>[ ](.*)  # test-code indicator
         ((?:\n\s*(?:[:|=.][ ]|\.).*)*)  # test-code results"""
 )
 TESTCASE_OUT_RE = re.compile(r"^\s*([:|=])(.*)$")
@@ -216,10 +216,7 @@ def parse_docstring_to_DocumentationEntry_items(
         logging.warning("``key_part`` is deprecated. Its value is discarded.")
 
     # Remove commented lines.
-    doc = filter_comments(doc).strip(r"\s")
-
-    # Remove leading <dl>...</dl>
-    # doc = DL_RE.sub("", doc)
+    doc = filter_comments(doc)  # .strip("\s")
 
     # pre-substitute Python code because it might contain tests
     doc, post_substitutions = pre_sub(
@@ -394,11 +391,16 @@ def compare_out(self, outs: tuple = tuple()) -> bool:
             # Mismatched number of output lines, and we don't have "..."
             return False
 
+        # Python 3.13 replaces tabs by a single space in docstrings.
+        # In doctests we replace tabs by sequences of four spaces.
+        def tabs_to_spaces(val):
+            return val.text.replace("\t", 4 * " ")
+
         # Need to check all output line by line
         for got, wanted in zip(outs, wanted_outs):
             if wanted.text == "...":
                 return True
-            if not got == wanted:
+            if not tabs_to_spaces(got) == tabs_to_spaces(wanted):
                 return False
 
         return True