fix(core): don't sympify strings in doctest

oscarbenjamin · oscarbenjamin · commit b38ec6b423eb · 2020-05-03T20:41:53.000+01:00
The Dict doctest relied on auto-sympification of strings in calling D.has('one'). This commit uses Symbol explicitly because has no longer accepts string input after 9c57fd0 BREAKING CHANGE: Using D.has('x') where D is a SymPy Dict will raise an exception. Use D.has(Symbol('x')) instead.
diff --git a/sympy/core/containers.py b/sympy/core/containers.py
@@ -202,6 +202,7 @@ class Dict(Basic):
     cannot be changed afterwards.  Otherwise it behaves identically
     to the Python dict.
 
+    >>> from sympy import Symbol
     >>> from sympy.core.containers import Dict
 
     >>> D = Dict({1: 'one', 2: 'two'})
@@ -215,7 +216,7 @@ class Dict(Basic):
 
     >>> 1 in D
     True
-    >>> D.has('one') # searches keys and values
+    >>> D.has(Symbol('one')) # searches keys and values
     True
     >>> 'one' in D # not in the keys
     False
