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New error messages in Python 3.14

Updated

Python 3.14 replaced many plain "invalid syntax" errors with messages that name the mistake, and made two common TypeErrors say what you were doing. Each example below ran on 3.13 and on 3.14.

Misspelt keywords

A word that is close to a Python keyword gets a suggestion. The check covers the common cases; some misspellings still give a plain "invalid syntax".

main.py
whille True:
    pass
Python 3.14 prints
  File "/home/me/project/main.py", line 1
    whille True:
    ^^^^^^
SyntaxError: invalid syntax. Did you mean 'while'?
PythonPrints
3.13SyntaxError: invalid syntax
3.14SyntaxError: invalid syntax. Did you mean 'while'?

Run on CPython 3.13.17 and 3.14.9, on October 25, 2026.

elif after else

main.py
answer = 42
if answer > 50:
    print("big")
else:
    print("small")
elif answer == 42:
    print("exactly")
Python 3.14 prints
  File "/home/me/project/main.py", line 6
    elif answer == 42:
    ^^^^
SyntaxError: 'elif' block follows an 'else' block
PythonPrints
3.13SyntaxError: invalid syntax
3.14SyntaxError: 'elif' block follows an 'else' block

Run on CPython 3.13.17 and 3.14.9, on October 25, 2026.

A statement where an expression belongs

In a conditional expression, pass, break or continue after else or before if now gets a message that says an expression is needed there.

main.py
x = 1 if True else pass
Python 3.14 prints
  File "/home/me/project/main.py", line 1
    x = 1 if True else pass
                       ^^^^
SyntaxError: expected expression after 'else', but statement is given
PythonPrints
3.13SyntaxError: invalid syntax
3.14SyntaxError: expected expression after 'else', but statement is given

Run on CPython 3.13.17 and 3.14.9, on October 25, 2026.

A quote that closes a string too early

main.py
title = "The "Big" Book"
Python 3.14 prints
  File "/home/me/project/main.py", line 1
    title = "The "Big" Book"
                  ^^^
SyntaxError: invalid syntax. Is this intended to be part of the string?
PythonPrints
3.13SyntaxError: invalid syntax
3.14SyntaxError: invalid syntax. Is this intended to be part of the string?

Run on CPython 3.13.17 and 3.14.9, on October 25, 2026.

Prefixes that cannot be combined

main.py
data = ub"abc"
Python 3.14 prints
  File "/home/me/project/main.py", line 1
    data = ub"abc"
           ^^
SyntaxError: 'u' and 'b' prefixes are incompatible
PythonPrints
3.13SyntaxError: invalid syntax
3.14SyntaxError: 'u' and 'b' prefixes are incompatible

Run on CPython 3.13.17 and 3.14.9, on October 25, 2026.

An attribute after as

import … as, from … import … as, except … as and case … as with a target such as a.b now get a message about the target.

main.py
import os as os.path
Python 3.14 prints
  File "/home/me/project/main.py", line 1
    import os as os.path
                 ^^^^^^^
SyntaxError: cannot use attribute as import target
PythonPrints
3.13SyntaxError: invalid syntax
3.14SyntaxError: cannot use attribute as import target

Run on CPython 3.13.17 and 3.14.9, on October 25, 2026.

Unhashable dict keys and set items

The message says whether the value was used as a dict key or a set element, and keeps the old wording in brackets.

main.py
counts = {}
counts[["a", "b"]] = 1
Python 3.14 prints
Traceback (most recent call last):
  File "/home/me/project/main.py", line 2, in <module>
    counts[["a", "b"]] = 1
    ~~~~~~^^^^^^^^^^^^
TypeError: cannot use 'list' as a dict key (unhashable type: 'list')
PythonPrints
3.13TypeError: unhashable type: 'list'
3.14TypeError: cannot use 'list' as a dict key (unhashable type: 'list')

Run on CPython 3.13.17 and 3.14.9, on October 25, 2026.

with on an async context manager

Entering an asynchronous context manager with with, or a synchronous one with async with, now says which one you meant.

main.py
class Lock:
    async def __aenter__(self):
        return self

    async def __aexit__(self, *exc):
        return False

with Lock():
    pass
Python 3.14 prints
Traceback (most recent call last):
  File "/home/me/project/main.py", line 8, in <module>
    with Lock():
         ~~~~^^
TypeError: 'Lock' object does not support the context manager protocol (missed __exit__ method) but it supports the asynchronous context manager protocol. Did you mean to use 'async with'?
PythonPrints
3.13TypeError: 'Lock' object does not support the context manager protocol
3.14TypeError: 'Lock' object does not support the context manager protocol (missed __exit__ method) but it supports the asynchronous context manager protocol. Did you mean to use 'async with'?

Run on CPython 3.13.17 and 3.14.9, on October 25, 2026.

The count in unpacking errors

Not in the What's New list, but visible in the runs: when the right side is a tuple, a list or a dict, 3.14 adds how many values it got.

main.py
x, y = (3, 4, 5)
Python 3.14 prints
Traceback (most recent call last):
  File "/home/me/project/main.py", line 1, in <module>
    x, y = (3, 4, 5)
    ^^^^
ValueError: too many values to unpack (expected 2, got 3)
PythonPrints
3.13ValueError: too many values to unpack (expected 2)
3.14ValueError: too many values to unpack (expected 2, got 3)

Run on CPython 3.13.17 and 3.14.9, on October 25, 2026.

Sources

Read on October 25, 2026.

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