8000 Fix datetime.strftime by karolyi · Pull Request #6317 · python/typeshed · GitHub
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Fix datetime.strftime #6317

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Merged
merged 4 commits into from
Dec 1, 2021
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Fix datetime.strftime #6317

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c8ace72
Fix datetime.strftime
karolyi Nov 16, 2021
0c52db0
Merge branch 'master' into patch-1
karolyi Nov 16, 2021
c855b8f
strftime(fmt: str) -> strftime(format: str)
karolyi Nov 16, 2021
2471060
Merge branch 'master' into patch-1
JelleZijlstra Dec 1, 2021
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strftime(fmt: str) -> strftime(format: str)
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@karolyi
karolyi committed Nov 16, 2021
commit c855b8f971c1993514a48e7605d19cc1a2961e79
4 changes: 2 additions & 2 deletions stdlib/datetime.pyi
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Expand Up @@ -55,7 +55,7 @@ class date:
@property
def day(self) -> int: ...
def ctime(self) -> str: ...
def strftime(self, fmt: str) -> str: ...
def strftime(self, format: str) -> str: ...
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Suggested change
def strftime(self, format: str) -> str: ...
def strftime(self, __format: str) -> str: ...

Let's make it positional-only as discussed.

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@karolyi karolyi Nov 18, 2021 •
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Quoting https://bugs.python.org/msg373421, specifically:

I think in typeshed they can safely change from fmt to format even today (which would almost certainly be more accurate to end user use cases).

What do you have against this?

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Type checking is all about warning users about situations where their code could lead to unexpected errors. Passing a keyword argument to this parameter will currently cause code to raise an error sometimes (but not all the time, or even most of the time), as not all systems can be guaranteed to use the C implementation of datetime (this is partly why the Python implementation exists alongside the C implementation). If a user passes a positional argument to this parameter, however, then there is no possibility of an error. So, it seems correct that, as the situation currently stands, a type-checker should raise an error if a keyword argument is passed to this parameter, as doing so could in some situations lead to unexpected errors.

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It's definitely better than the current situation to have the parameter named format, but I agree that the best option for now is to have it as a positional-only parameter in the stub.

def __format__(self, fmt: str) -> str: ...
def isoformat(self) -> str: ...
def timetuple(self) -> struct_time: ...
Expand Down Expand Up @@ -118,7 +118,7 @@ class time:
if sys.version_info >= (3, 7):
@classmethod
def fromisoformat(cls: Type[_S], time_string: str) -> _S: ...
def strftime(self, fmt: str) -> str: ...
def strftime(self, format: str) -> str: ...
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Suggested change
def strftime(self, format: str) -> str: ...
def strftime(self, __format: str) -> str: ...

def __format__(self, fmt: str) -> str: ...
def utcoffset(self) -> timedelta | None: ...
def tzname(self) -> str | None: ...
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