failed to poetry add -D black using python 3.10-rc2, 3.9 works well #4586
Description
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[X ] I am on the latest Poetry version.
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[ x] I have searched the issues of this repo and believe that this is not a duplicate.
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[ x] If an exception occurs when executing a command, I executed it again in debug mode (
-vvvoption). -
OS version and name: ubuntu 20.04
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Poetry version: 1.1.10
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Link of a Gist with the contents of your pyproject.toml file: the initial default one right after poetry new
Issue
Works for 3.8/3.9 but not 3.10-rc2:
poetry new X; cd X; poetry add -D -vvv black
Finding the necessary packages for the current system
Package operations: 15 installs, 0 updates, 0 removals, 3 skipped
• Removing atomicwrites (1.4.0): Pending...
• Removing atomicwrites (1.4.0): Skipped for the following reason: Not currently installed
• Removing colorama (0.4.4): Pending...
• Removing colorama (0.4.4): Skipped for the following reason: Not currently installed
• Removing typing-extensions (3.10.0.2): Pending...
• Removing typing-extensions (3.10.0.2): Skipped for the following reason: Not currently installed
• Installing pyparsing (2.4.7): Pending...
• Installing pyparsing (2.4.7): Failed
JSONDecodeError
Expecting value: line 1 column 1 (char 0)
at /usr/lib/python3.10/json/decoder.py:355 in raw_decode
351│ """
352│ try:
353│ obj, end = self.scan_once(s, idx)
354│ except StopIteration as err:
→ 355│ raise JSONDecodeError("Expecting value", s, err.value) from None
356│ return obj, end
357│
Failed to add packages, reverting the pyproject.toml file to its original content.