fixup: Format Python code with Black

Author: rocky

mathics/builtin/assignment.py

@@ -315,8 +315,9 @@ def assign_elementary(self, lhs, rhs, evaluation, tags=None, upset=False):
             #    $Context = $Context <> "test`"
             #
             if new_context.startswith("`"):
-                new_context = evaluation.definitions.get_current_context() + new_context.lstrip(
-                    "`"
+                new_context = (
+                    evaluation.definitions.get_current_context()
+                    + new_context.lstrip("`")
                 )
 
             evaluation.definitions.set_current_context(new_context)

mathics/builtin/files_io/importexport.py

@@ -1092,7 +1092,7 @@ class RegisterImport(Builtin):
 
     def apply(self, formatname, function, posts, evaluation, options):
         """ImportExport`RegisterImport[formatname_String, function_, posts_,
-                OptionsPattern[ImportExport`RegisterImport]]"""
+        OptionsPattern[ImportExport`RegisterImport]]"""
         evaluation.cache_result = False
 
         if function.has_form("List", None):
@@ -1175,7 +1175,7 @@ class RegisterExport(Builtin):
 
     def apply(self, formatname, function, evaluation, options):
         """ImportExport`RegisterExport[formatname_String, function_,
-                OptionsPattern[ImportExport`RegisterExport]]"""
+        OptionsPattern[ImportExport`RegisterExport]]"""
 
         evaluation.cache_result = False
         EXPORTERS[formatname.get_string_value()] = (function, options)

mathics/builtin/system.py

@@ -621,7 +621,7 @@ class ClearSystemCache(Builtin):
       <dt>'ClearSystemCache[]'
       <dd> Clears the internal system cache of expressions.
     </dl>
-    
+
     """
 
     def apply_clear(self, evaluation):

mathics/core/evaluation.py

@@ -267,7 +267,6 @@ def __init__(
         self.cache_eval = {}
         self.cache_result = False
 
-
     def parse(self, query):
         "Parse a single expression and print the messages."
         from mathics.core.parser import MathicsSingleLineFeeder

mathics/core/expression.py

@@ -1318,11 +1318,14 @@ def evaluate(self, evaluation) -> typing.Union["Expression", "Symbol"]:
         # evaluation.cache_result can be set here or from inside the evaluation
         # of a branch. Once it is set to false, the result is not cached,
         # and hence, not used.
-        if evaluation.cache_result and  (self.get_head_name() in (
-            "System`Out",
-            "System`ToBoxes",
-            "System`MakeBoxes",
-        )):
+        if evaluation.cache_result and (
+            self.get_head_name()
+            in (
+                "System`Out",
+                "System`ToBoxes",
+                "System`MakeBoxes",
+            )
+        ):
             evaluation.cache_result = False
 
         if evaluation.cache_result: