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Poor error message when TypeError is raised during dict construction #116436
Description
~/dev/cpython main λ cat z.py
import random
def foo():
yield random.randint(100) # oops, only passed in one argument
yield "value"
dict([foo() for _ in range(3)])
~/dev/cpython main λ python3.12 z.py
Traceback (most recent call last):
File "/Users/shantanu/dev/cpython/z.py", line 7, in <module>
dict([foo() for _ in range(3)])
TypeError: cannot convert dictionary update sequence element #0 to a sequence
I'd expect something like what PyPy gives:
Traceback (most recent call last):
File "/Users/shantanu/dev/cpython/z.py", line 7, in <module>
dict([foo() for _ in range(3)])
File "/Users/shantanu/dev/cpython/z.py", line 4, in foo
yield random.randint(100) # oops, only passed in one argument
^^^^^^^^^^^^^^^^^^^
TypeError: Random.randint() missing 1 required positional argument: 'b'
Activity
[-]Regression in error message when TypeError is raised during dict construction[/-][+]Poor error message when TypeError is raised during dict construction[/+]pythongh-116436: Improve error message when TypeError occurs during d…
Rajendra1308 commentedon Mar 7, 2024
Hey @hauntsaninja I would like to work on this issue. Could you please provide more info and also what file needs to be modified?
gh-116436: Improve error message when TypeError occurs during dict up…
StanFromIreland commentedon Oct 13, 2025
Triage: Can this be closed as completed?
hauntsaninja commentedon Oct 14, 2025
Yup, this can be closed. I think I merged the PR after it went 18 months without a review