DOC: Validate in docstrings that numpy and pandas are not imported

scripts/tests/test_validate_docstrings.py

@@ -218,6 +218,18 @@ def mode(self, axis, numeric_only):
         """
         pass
 
+    def good_imports(self):
+        """
+        Ensure import other than numpy and pandas are fine.
+
+        Examples
+        --------
+        This example does not import pandas or import numpy.
+        >>> import time
+        >>> import datetime
+        """
+        pass
+
 
 class BadGenericDocStrings(object):
     """Everything here has a bad docstring
@@ -700,6 +712,11 @@ def test_bad_generic_functions(self, func):
                      marks=pytest.mark.xfail),
         pytest.param('BadReturns', 'no_punctuation', ('foo',),
                      marks=pytest.mark.xfail),
+        # Examples tests
+        ('BadGenericDocStrings', 'method',
+         ('numpy does not need to be imported in the examples,')),
+        ('BadGenericDocStrings', 'method',
+         ('pandas does not need to be imported in the examples,')),
         # See Also tests
         ('BadSeeAlso', 'prefix_pandas',
          ('pandas.Series.rename in `See Also` section '

scripts/validate_docstrings.py

@@ -402,6 +402,12 @@ def examples_errors(self):
             error_msgs += f.getvalue()
         return error_msgs
 
+    @property
+    def examples_source_code(self):
+        codes = doctest.DocTestParser().get_examples(self.raw_doc)
+        lines = [line.source for line in codes]
+        return lines
+
 
 def validate_one(func_name):
     """
@@ -531,6 +537,13 @@ def validate_one(func_name):
         examples_errs = doc.examples_errors
         if examples_errs:
             errs.append('Examples do not pass tests')
+        examples_source_code = ''.join(doc.examples_source_code)
+        if 'import numpy' in examples_source_code:
+            errs.append("numpy does not need to be imported in the examples, "
+                        "as it's assumed to be already imported as np")
+        if 'import pandas' in examples_source_code:
+            errs.append("pandas does not need to be imported in the examples, "
+                        "as it's assumed to be already imported as pd")
 
     return {'type': doc.type,
             'docstring': doc.clean_doc,