🕵️ Stack Trace Lineup

from enum import Enum

class C(Enum):
    R = 1

C.R.value.append(2)

Traceback (most recent call last):
  File "lineup.py", line 6, in <module>
    C.R.value.append(2)
    ^^^^^^^^^^^^^^^^
AttributeError: 'int' object has no attribute 'append'

pairs = [("a", 1), ("b", 2), ("a", 3)]
d = {k: v for k, v in pairs}
print(d)

Traceback (most recent call last):
  File "lineup.py", line 2, in <module>
    d = {k: v for k, v in pairs}
        ^^^^^^^^^^^^^^^^^^^^^^^^
KeyError: 'a' — duplicate key in comprehension

",".join([1, 2, 3])

Traceback (most recent call last):
  File "lineup.py", line 1, in <module>
    ",".join([1, 2, 3])
    ~~~~~~~~^^^^^^^^^^^
TypeError: sequence item 0: expected str instance, int found

import importlib
importlib.import_module("this.does.not.exist.anywhere")

Traceback (most recent call last):
  File "lineup.py", line 2, in <module>
    importlib.import_module("this.does.not.exist.anywhere")
    ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
ModuleNotFoundError: No module named 'this'

class X: pass
x = X()
x.__class__ = int

Traceback (most recent call last):
  File "lineup.py", line 3, in <module>
    x.__class__ = int
    ^^^^^^^^^^^
TypeError: __class__ assignment: 'int' object layout differs from 'X'