comparison hgdemandimport/demandimportpy3.py @ 44117:c5e0a9b97b8a

hgdemandimport: disable on Python 3.5

The demand importer functionality isn't working at all on Python 3.5.
I'm not sure what's wrong.

Since it isn't working, let's disable it completely.

```
$ HGRCPATH= hyperfine -w 1 -r 50 -- "~/.pyenv/versions/3.5.9/bin/python ./hg version" \
  "HGDEMANDIMPORT=disable ~/.pyenv/versions/3.5.9/bin/python ./hg version"
Benchmark #1: ~/.pyenv/versions/3.5.9/bin/python ./hg version
  Time (mean ± σ):     163.7 ms ±   2.2 ms    [User: 148.5 ms, System: 15.7 ms]
  Range (min … max):   161.0 ms … 170.2 ms    50 runs

Benchmark #2: HGDEMANDIMPORT=disable ~/.pyenv/versions/3.5.9/bin/python ./hg version
  Time (mean ± σ):     164.3 ms ±   1.4 ms    [User: 148.2 ms, System: 16.6 ms]
  Range (min … max):   161.4 ms … 169.8 ms    50 runs
```

Differential Revision: https://phab.mercurial-scm.org/D7953

44116:b5aaa09be18c

from . import tracing

_deactivated = False


class _lazyloaderex(importlib.util.LazyLoader):
    """This is a LazyLoader except it also follows the _deactivated global and
    the ignore list.
    """

                self.loader.exec_module(module)
            else:
                super().exec_module(module)


# This is 3.6+ because with Python 3.5 it isn't possible to lazily load
# extensions. See the discussion in https://bugs.python.org/issue26186 for more.
if sys.version_info[0:2] >= (3, 6):
    _extensions_loader = _lazyloaderex.factory(
        importlib.machinery.ExtensionFileLoader
    )
else:
    _extensions_loader = importlib.machinery.ExtensionFileLoader

_bytecode_loader = _lazyloaderex.factory(
    importlib.machinery.SourcelessFileLoader
)
_source_loader = _lazyloaderex.factory(importlib.machinery.SourceFileLoader)

    except ValueError:
        pass


def enable():
    sys.path_hooks.insert(0, _makefinder)


@contextlib.contextmanager
def deactivated():

44117:c5e0a9b97b8a

from . import tracing

_deactivated = False

# Python 3.5's LazyLoader doesn't work for some reason.
# https://bugs.python.org/issue26186 is a known issue with extension
# importing. But it appears to not have a meaningful effect with
# Mercurial.
_supported = sys.version_info[0:2] >= (3, 6)


class _lazyloaderex(importlib.util.LazyLoader):
    """This is a LazyLoader except it also follows the _deactivated global and
    the ignore list.
    """

                self.loader.exec_module(module)
            else:
                super().exec_module(module)


_extensions_loader = _lazyloaderex.factory(
    importlib.machinery.ExtensionFileLoader
)
_bytecode_loader = _lazyloaderex.factory(
    importlib.machinery.SourcelessFileLoader
)
_source_loader = _lazyloaderex.factory(importlib.machinery.SourceFileLoader)

    except ValueError:
        pass


def enable():
    if not _supported:
        return

    sys.path_hooks.insert(0, _makefinder)


@contextlib.contextmanager
def deactivated():