Use fstrings (#353)

Convert string formatting to f-strings with flynt

7 files changed, 39 insertions, 42 deletions

diff --git a/doc/conf.py b/doc/conf.py
index 2fa9477..ad142da 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -141,7 +141,7 @@ html_sidebars = {
     "**": [],
 }
 
-html_title = "%s v%s Manual" % (project, version)
+html_title = f"{project} v{version} Manual"
 html_last_updated_fmt = '%b %d, %Y'
 
 # Add any paths that contain custom static files (such as style sheets) here,
diff --git a/numpydoc/docscrape.py b/numpydoc/docscrape.py
index 0127675..f0e42eb 100644
--- a/numpydoc/docscrape.py
+++ b/numpydoc/docscrape.py
@@ -101,7 +101,7 @@ class ParseError(Exception):
     def __str__(self):
         message = self.args[0]
         if hasattr(self, 'docstring'):
-            message = "%s in %r" % (message, self.docstring)
+            message = f"{message} in {self.docstring!r}"
         return message
 
 
@@ -154,7 +154,7 @@ class NumpyDocString(Mapping):
 
     def __setitem__(self, key, val):
         if key not in self._parsed_data:
-            self._error_location("Unknown section %s" % key, error=False)
+            self._error_location(f"Unknown section {key}", error=False)
         else:
             self._parsed_data[key] = val
 
@@ -492,11 +492,11 @@ class NumpyDocString(Mapping):
             links = []
             for func, role in funcs:
                 if role:
-                    link = ':%s:`%s`' % (role, func)
+                    link = f':{role}:`{func}`'
                 elif func_role:
-                    link = ':%s:`%s`' % (func_role, func)
+                    link = f':{func_role}:`{func}`'
                 else:
-                    link = "`%s`_" % func
+                    link = f"`{func}`_"
                 links.append(link)
             link = ', '.join(links)
             out += [link]
@@ -519,12 +519,12 @@ class NumpyDocString(Mapping):
         default_index = idx.get('default', '')
         if default_index:
             output_index = True
-        out += ['.. index:: %s' % default_index]
+        out += [f'.. index:: {default_index}']
         for section, references in idx.items():
             if section == 'default':
                 continue
             output_index = True
-            out += ['   :%s: %s' % (section, ', '.join(references))]
+            out += [f"   :{section}: {', '.join(references)}"]
         if output_index:
             return out
         return ''
@@ -583,9 +583,8 @@ class FunctionDoc(NumpyDocString):
 
         if self._role:
             if self._role not in roles:
-                print("Warning: invalid role %s" % self._role)
-            out += '.. %s:: %s\n    \n\n' % (roles.get(self._role, ''),
-                                             func_name)
+                print(f"Warning: invalid role {self._role}")
+            out += f".. {roles.get(self._role, '')}:: {func_name}\n    \n\n"
 
         out += super().__str__(func_role=self._role)
         return out
@@ -606,7 +605,7 @@ class ClassDoc(NumpyDocString):
     def __init__(self, cls, doc=None, modulename='', func_doc=FunctionDoc,
                  config=None):
         if not inspect.isclass(cls) and cls is not None:
-            raise ValueError("Expected a class or None, but got %r" % cls)
+            raise ValueError(f"Expected a class or None, but got {cls!r}")
         self._cls = cls
 
         if 'sphinx' in sys.modules:
diff --git a/numpydoc/docscrape_sphinx.py b/numpydoc/docscrape_sphinx.py
index afb5c33..5ded4f0 100644
--- a/numpydoc/docscrape_sphinx.py
+++ b/numpydoc/docscrape_sphinx.py
@@ -138,7 +138,7 @@ class SphinxDocString(NumpyDocString):
         # XXX: If changing the following, please check the rendering when param
         # ends with '_', e.g. 'word_'
         # See https://github.com/numpy/numpydoc/pull/144
-        display_param = '**%s**' % param
+        display_param = f'**{param}**'
 
         if not fake_autosummary:
             return display_param, desc
@@ -156,14 +156,12 @@ class SphinxDocString(NumpyDocString):
 
         prefix = getattr(self, '_name', '')
         if prefix:
-            link_prefix = '%s.' % prefix
+            link_prefix = f'{prefix}.'
         else:
             link_prefix = ''
 
         # Referenced object has a docstring
-        display_param = ':obj:`%s <%s%s>`' % (param,
-                                              link_prefix,
-                                              param)
+        display_param = f':obj:`{param} <{link_prefix}{param}>`'
         if obj_doc:
             # Overwrite desc. Take summary logic of autosummary
             desc = re.split(r'\n\s*\n', obj_doc.strip(), 1)[0]
@@ -239,11 +237,11 @@ class SphinxDocString(NumpyDocString):
         """
         out = []
         if self[name]:
-            out += ['.. rubric:: %s' % name, '']
+            out += [f'.. rubric:: {name}', '']
             prefix = getattr(self, '_name', '')
 
             if prefix:
-                prefix = '~%s.' % prefix
+                prefix = f'~{prefix}.'
 
             autosum = []
             others = []
@@ -259,7 +257,7 @@ class SphinxDocString(NumpyDocString):
 
                 if param_obj and pydoc.getdoc(param_obj):
                     # Referenced object has a docstring
-                    autosum += ["   %s%s" % (prefix, param.name)]
+                    autosum += [f"   {prefix}{param.name}"]
                 else:
                     others.append(param)
 
@@ -279,7 +277,7 @@ class SphinxDocString(NumpyDocString):
                     desc = " ".join(x.strip()
                                           for x in param.desc).strip()
                     if param.type:
-                        desc = "(%s) %s" % (param.type, desc)
+                        desc = f"({param.type}) {desc}"
                     out += [fmt % (name, desc)]
                 out += [hdr]
             out += ['']
@@ -316,14 +314,14 @@ class SphinxDocString(NumpyDocString):
         if len(idx) == 0:
             return out
 
-        out += ['.. index:: %s' % idx.get('default', '')]
+        out += [f".. index:: {idx.get('default', '')}"]
         for section, references in idx.items():
             if section == 'default':
                 continue
             elif section == 'refguide':
-                out += ['   single: %s' % (', '.join(references))]
+                out += [f"   single: {', '.join(references)}"]
             else:
-                out += ['   %s: %s' % (section, ','.join(references))]
+                out += [f"   {section}: {','.join(references)}"]
         out += ['']
         return out
 
@@ -343,7 +341,7 @@ class SphinxDocString(NumpyDocString):
                 m = re.match(r'.. \[([a-z0-9._-]+)\]', line, re.I)
                 if m:
                     items.append(m.group(1))
-            out += ['   ' + ", ".join(["[%s]_" % item for item in items]), '']
+            out += ['   ' + ", ".join([f"[{item}]_" for item in items]), '']
         return out
 
     def _str_examples(self):
diff --git a/numpydoc/numpydoc.py b/numpydoc/numpydoc.py
index 5b11136..773079b 100644
--- a/numpydoc/numpydoc.py
+++ b/numpydoc/numpydoc.py
@@ -63,10 +63,10 @@ def rename_references(app, what, name, obj, options, lines):
         for r in references:
             new_r = prefix + '-' + r
             for i, line in enumerate(lines):
-                lines[i] = lines[i].replace('[%s]_' % r,
-                                            '[%s]_' % new_r)
-                lines[i] = lines[i].replace('.. [%s]' % r,
-                                            '.. [%s]' % new_r)
+                lines[i] = lines[i].replace(f'[{r}]_',
+                                            f'[{new_r}]_')
+                lines[i] = lines[i].replace(f'.. [{r}]',
+                                            f'.. [{new_r}]')
 
 
 def _is_cite_in_numpydoc_docstring(citation_node):
@@ -119,10 +119,10 @@ def relabel_references(app, doc):
             # Sphinx has created pending_xref nodes with [reftext] text.
             def matching_pending_xref(node):
                 return (isinstance(node, pending_xref) and
-                        node[0].astext() == '[%s]' % ref_text)
+                        node[0].astext() == f'[{ref_text}]')
 
             for xref_node in ref.parent.traverse(matching_pending_xref):
-                xref_node.replace(xref_node[0], Text('[%s]' % new_text))
+                xref_node.replace(xref_node[0], Text(f'[{new_text}]'))
             ref.replace(ref_text, new_text.copy())
 
 
@@ -199,11 +199,11 @@ def mangle_docstrings(app, what, name, obj, options, lines):
     if (app.config.numpydoc_edit_link and hasattr(obj, '__name__') and
             obj.__name__):
         if hasattr(obj, '__module__'):
-            v = dict(full_name="%s.%s" % (obj.__module__, obj.__name__))
+            v = dict(full_name=f"{obj.__module__}.{obj.__name__}")
         else:
             v = dict(full_name=obj.__name__)
         lines += ['', '.. htmlonly::', '']
-        lines += ['    %s' % x for x in
+        lines += [f'    {x}' for x in
                   (app.config.numpydoc_edit_link % v).split("\n")]
 
     # call function to replace reference numbers so that there are no
diff --git a/numpydoc/tests/test_validate.py b/numpydoc/tests/test_validate.py
index ba56e2d..0e27dc8 100644
--- a/numpydoc/tests/test_validate.py
+++ b/numpydoc/tests/test_validate.py
@@ -1388,7 +1388,7 @@ class TestValidator:
 class TestValidatorClass:
     @pytest.mark.parametrize("invalid_name", ["unknown_mod", "unknown_mod.MyClass"])
     def test_raises_for_invalid_module_name(self, invalid_name):
-        msg = 'No module can be imported from "{}"'.format(invalid_name)
+        msg = f'No module can be imported from "{invalid_name}"'
         with pytest.raises(ImportError, match=msg):
             numpydoc.validate.Validator._load_obj(invalid_name)
 
@@ -1398,6 +1398,6 @@ class TestValidatorClass:
     def test_raises_for_invalid_attribute_name(self, invalid_name):
         name_components = invalid_name.split(".")
         obj_name, invalid_attr_name = name_components[-2], name_components[-1]
-        msg = "'{}' has no attribute '{}'".format(obj_name, invalid_attr_name)
+        msg = f"'{obj_name}' has no attribute '{invalid_attr_name}'"
         with pytest.raises(AttributeError, match=msg):
             numpydoc.validate.Validator._load_obj(invalid_name)
diff --git a/numpydoc/validate.py b/numpydoc/validate.py
index 3675737..b4b7e99 100644
--- a/numpydoc/validate.py
+++ b/numpydoc/validate.py
@@ -164,7 +164,7 @@ class Validator:
             else:
                 break
         else:
-            raise ImportError("No module can be imported " 'from "{}"'.format(name))
+            raise ImportError(f"No module can be imported from \"{name}\"")
 
         for part in func_parts:
             obj = getattr(obj, part)
@@ -288,9 +288,9 @@ class Validator:
             Add stars to *args and **kwargs parameters
             """
             if info.kind == inspect.Parameter.VAR_POSITIONAL:
-                return "*{}".format(param_name)
+                return f"*{param_name}"
             elif info.kind == inspect.Parameter.VAR_KEYWORD:
-                return "**{}".format(param_name)
+                return f"**{param_name}"
             else:
                 return param_name
 
@@ -420,7 +420,7 @@ def _check_desc(desc, code_no_desc, code_no_upper, code_no_period, **kwargs):
     # Find and strip out any sphinx directives
     desc = "\n".join(desc)
     for directive in DIRECTIVES:
-        full_directive = ".. {}".format(directive)
+        full_directive = f".. {directive}"
         if full_directive in desc:
             # Only retain any description before the directive
             desc = desc[: desc.index(full_directive)].rstrip("\n")
diff --git a/numpydoc/xref.py b/numpydoc/xref.py
index ee3954b..e3f507d 100644
--- a/numpydoc/xref.py
+++ b/numpydoc/xref.py
@@ -126,7 +126,7 @@ def make_xref(param_type, xref_aliases, xref_ignore):
             ignore_set = set()
         else:
             raise TypeError(
-                "xref_ignore must be a set or 'all', got {}".format(xref_ignore)
+                f"xref_ignore must be a set or 'all', got {xref_ignore}"
             )
 
     if param_type in xref_aliases:
@@ -137,9 +137,9 @@ def make_xref(param_type, xref_aliases, xref_ignore):
 
     if QUALIFIED_NAME_RE.match(link) and link not in ignore_set:
         if link != title:
-            return ':obj:`%s <%s>`' % (title, link)
+            return f':obj:`{title} <{link}>`'
         if wrap_unknown:
-            return ':obj:`%s`' % link
+            return f':obj:`{link}`'
         return link
 
     def _split_and_apply_re(s, pattern):