Bug report

time.sleep(float('nan')) raisesValueError, butasyncio.sleep(float('nan')) is valid and sleeps for 0. This seems bad, andasyncio.sleep should probably also raiseValueError.

importasyncioimporttimetry:time.sleep(float('nan'))exceptValueError:print("time.sleep raised ValueError")asyncdeffoo()->None:awaitasyncio.sleep(float('nan'))print("asyncio.sleep does not raise any error")asyncio.run(foo())

$ python foo.pytime.sleep raised ValueErrorasyncio.sleep does not raise any error

time.sleep andasyncio.sleep do differ in behaviour when it comes to negative numbers and changing that behaviour was considered a breaking change without strong reason:#83879
nan feels like it shouldvery rare to be passed intentionally, but the potential gain might also be small enough that this isn't worth fixing.

Related:python-trio/trio#2493

Your environment

• CPython versions tested on: 3.8 to 3.11
• Operating system and architecture:Linux 6.3.4-arch1-1

Linked PRs

• gh-105331: Fix asyncio.sleep() bug #105501
• gh-105331: Fix asyncio.sleep() bug #105513
• gh-105331: Fix asyncio.sleep() bug #105641