dynamic param completion works now better with subcalls of statements

jedi/dynamic.py

@@ -119,7 +119,11 @@ def search_params(param):
 
             for stmt in possible_stmts:
                 if not isinstance(stmt, parsing.Import):
-                    evaluate.follow_statement(stmt)
+                    calls = _scan_array(stmt.get_assignment_calls(), func_name)
+                    for c in calls:
+                        # no execution means that params cannot be set
+                        if c.execution:
+                            evaluate.follow_call(c)
             return listener.param_possibilities
 
         result = []

test/completion/dynamic.py

@@ -25,6 +25,10 @@ def func(a):
     #? 
     return a
 
+def func(a):
+    #? float()
+    return a
+str(func(1.0))
 
 # -----------------
 # *args, **args