Go over doc examples to remove fragility

Author: rocky

mathics/builtin/scoping.py

@@ -364,8 +364,6 @@ class Context(Builtin):
      = Global`
     >> Context[b`c]
      = b`
-    >> Context[Sin] // InputForm
-     = "System`"
 
     >> InputForm[Context[]]
      = "Global`"
@@ -413,8 +411,7 @@ class Contexts(Builtin):
 
     ## this assignment makes sure that a definition in Global` exists
     >> x = 5;
-    >> Contexts[] // InputForm
-     = {"CombinatoricaOld`", "Global`", "ImportExport`", "Internal`", "System`", "System`Convert`B64Dump`", "System`Convert`Image`", "System`Convert`JSONDump`", "System`Convert`TableDump`", "System`Convert`TextDump`", "System`Private`", "XML`", "XML`Parser`"}
+    X> Contexts[] // InputForm
     """
 
     def apply(self, evaluation):
@@ -465,17 +462,12 @@ class ContextPath(Predefined):
         <dd>is the search path for contexts.
     </dl>
 
-    >> $ContextPath // InputForm
-     = {"Global`", "System`"}
-
-    #> $ContextPath = Sin[2]
-     : Sin[2] is not a list of valid context names ending in `.
-     = Sin[2]
+    X> $ContextPath // InputForm
 
     #> x`x = 1; x
      = x
-    #> $ContextPath = {"x`"};
-    #> x
+    >> $ContextPath = {"x`"};
+    >> x
      = 1
     #> System`$ContextPath
      = {x`}
@@ -502,8 +494,6 @@ class Begin(Builtin):
 
     >> Begin["test`"]
      = test`
-    >> {$Context, $ContextPath}
-     = {test`, {Global`, System`}}
     >> Context[newsymbol]
      = test`
     >> End[]
@@ -569,19 +559,8 @@ class BeginPackage(Builtin):
     'BeginPackage' changes the values of '$Context' and
     '$ContextPath', setting the current context to $context$.
 
-    >> {$Context, $ContextPath}
-     = {Global`, {Global`, System`}}
     >> BeginPackage["test`"]
      = test`
-    >> {$Context, $ContextPath}
-     = {test`, {test`, System`}}
-    >> Context[newsymbol]
-     = test`
-    >> EndPackage[]
-    >> {$Context, $ContextPath}
-     = {Global`, {test`, Global`, System`}}
-    >> EndPackage[]
-     : No previous context defined.
     """
 
     messages = {