Use co_qualname in reporting when possible

line_profiler/_line_profiler.pyx

@@ -24,6 +24,7 @@ from libc.stdint cimport int64_t
 from libcpp.unordered_map cimport unordered_map
 import threading
 import opcode
+import types
 
 NOP_VALUE: int = opcode.opmap['NOP']
 
@@ -32,6 +33,9 @@ NOP_VALUE: int = opcode.opmap['NOP']
 # if sys.version_info[0:2] >= (3, 11):
 NOP_BYTES: bytes = NOP_VALUE.to_bytes(2, byteorder=byteorder)
 
+# This should be true for Python >=3.11a1
+HAS_CO_QUALNAME: bool = hasattr(types.CodeType, 'co_qualname'))
+
 # long long int is at least 64 bytes assuming c99
 ctypedef unsigned long long int uint64
 ctypedef long long int int64
@@ -155,17 +159,20 @@ else:
 
 def label(code):
     """
-    Return a (filename, first_lineno, qual_name) tuple for a given code object.
+    Return a (filename, first_lineno, _name) tuple for a given code object.
 
     This is the similar labelling as used by the cProfile module in Python 2.5.
+
+    Note:
+        In Python >=3.11 we use we return qualname for _name.
+        In older versions of Python we just return name.
     """
     if isinstance(code, str):
         return ('~', 0, code)    # built-in functions ('~' sorts at the end)
     else:
-        try:
-            # Python >=3.11a1
+        if HAS_CO_QUALNAME:
             return (code.co_filename, code.co_firstlineno, code.co_qualname)
-        except AttributeError:
+        else:
             return (code.co_filename, code.co_firstlineno, code.co_name)