Revert "Use __str__ instead of to_string"

This reverts commit 1151700114.

jedi/evaluate/compiled/context.py

@@ -309,7 +309,7 @@ class SignatureParamName(ParamNameInterface, AbstractNameDefinition):
     def string_name(self):
         return self._signature_param.name
 
-    def __str__(self):
+    def to_string(self):
         s = self._kind_string() + self.string_name
         if self._signature_param.has_annotation:
             s += ': ' + self._signature_param.annotation_string
@@ -341,7 +341,7 @@ class UnresolvableParamName(ParamNameInterface, AbstractNameDefinition):
     def get_kind(self):
         return Parameter.POSITIONAL_ONLY
 
-    def __str__(self):
+    def to_string(self):
         string = self.string_name
         if self._default:
             string += '=' + self._default

jedi/evaluate/names.py

@@ -178,7 +178,7 @@ class ParamNameInterface(_ParamMixin):
     def get_kind(self):
         raise NotImplementedError
 
-    def __str__(self):
+    def to_string(self):
         raise NotImplementedError
 
     def get_param(self):
@@ -201,7 +201,7 @@ class BaseTreeParamName(ParamNameInterface, AbstractTreeName):
     annotation_node = None
     default_node = None
 
-    def __str__(self):
+    def to_string(self):
         output = self._kind_string() + self.string_name
         annotation = self.annotation_node
         default = self.default_node
@@ -277,9 +277,6 @@ class ParamNameWrapper(_ParamMixin):
     def __getattr__(self, name):
         return getattr(self._wrapped_param_name, name)
 
-    def __str__(self):
-        return str(self._wrapped_param_name)
-
     def __repr__(self):
         return '<%s: %s>' % (self.__class__.__name__, self._wrapped_param_name)
 

jedi/evaluate/signature.py

@@ -2,7 +2,7 @@ from jedi._compatibility import Parameter
 
 
 class _SignatureMixin(object):
-    def __str__(self):
+    def to_string(self):
         def param_strings():
             is_positional = False
             is_kw_only = False
@@ -19,7 +19,7 @@ class _SignatureMixin(object):
                     yield '*'
                     is_kw_only = True
 
-                yield str(n)
+                yield n.to_string()
 
             if is_positional:
                 yield '/'