Python os 模块，stat_float_times() 实例源码
我们从Python开源项目中，提取了以下8个代码示例，用于说明如何使用os.stat_float_times()。
def setUp(self):
self.dirname = support.TESTFN
self.fname = os.path.join(self.dirname, "f1")
self.addCleanup(support.rmtree, self.dirname)
os.mkdir(self.dirname)
with open(self.fname, 'wb') as fp:
fp.write(b"ABC")
def restore_float_times(state):
with warnings.catch_warnings():
warnings.simplefilter("ignore", DeprecationWarning)
os.stat_float_times(state)
# ensure that st_atime and st_mtime are float
with warnings.catch_warnings():
warnings.simplefilter("ignore", DeprecationWarning)
old_float_times = os.stat_float_times(-1)
self.addCleanup(restore_float_times, old_float_times)
os.stat_float_times(True)
def getmtime(x):
sft = stat_float_times()
stat_float_times(True)
try:
return _getmtime(x)
finally:
stat_float_times(sft)
def getmtime(x):
sft = stat_float_times()
stat_float_times(True)
try:
return _getmtime(x)
finally:
stat_float_times(sft)
def _test_utime_subsecond(self, set_time_func):
asec, amsec = 1, 901
atime = asec + amsec * 1e-3
msec, mmsec = 2, 901
mtime = msec + mmsec * 1e-3
filename = self.fname
os.utime(filename, (0, 0))
set_time_func(filename, atime, mtime)
with warnings.catch_warnings():
warnings.simplefilter("ignore", DeprecationWarning)
os.stat_float_times(True)
st = os.stat(filename)
self.assertAlmostEqual(st.st_atime, atime, places=3)
self.assertAlmostEqual(st.st_mtime, mtime, places=3)
def _test_utime_subsecond(self, set_time_func):
asec, amsec = 1, 901
atime = asec + amsec * 1e-3
msec, mmsec = 2, 901
mtime = msec + mmsec * 1e-3
filename = self.fname
os.utime(filename, (0, 0))
set_time_func(filename, atime, mtime)
with warnings.catch_warnings():
warnings.simplefilter("ignore", DeprecationWarning)
os.stat_float_times(True)
st = os.stat(filename)
self.assertAlmostEqual(st.st_atime, atime, places=3)
self.assertAlmostEqual(st.st_mtime, mtime, places=3)
def __call__(self, *args, **kwargs):
""" Run command and return its dependencies and outputs, using before
and after access times to determine dependencies. """
# For Python pre-2.5, ensure os.stat() returns float atimes
old_stat_float = os.stat_float_times()
os.stat_float_times(True)
originals = self.file_times()
if self.atimes == 2:
befores = originals
atime_resolution = 0
mtime_resolution = 0
else:
befores = self._age_atimes(originals)
atime_resolution = FAT_atime_resolution
mtime_resolution = FAT_mtime_resolution
shell_keywords = dict(silent=False)
shell_keywords.update(kwargs)
shell(*args, **shell_keywords)
afters = self.file_times()
deps = []
outputs = []
for name in afters:
if name in befores:
# if file exists before+after && mtime changed, add to outputs
# Note: Can't just check that atimes > than we think they were
# before because os might have rounded them to a later
# date than what we think we set them to in befores.
# So we make sure they're > by at least 1/2 the
# resolution. This will work for anything with a
# resolution better than FAT.
if afters[name][1]-mtime_resolution/2 > befores[name][1]:
if not self.ignore(name):
outputs.append(name)
elif afters[name][0]-atime_resolution/2 > befores[name][0]:
# otherwise add to deps if atime changed
if not self.ignore(name):
deps.append(name)
else:
# file created (in afters but not befores), add as output
if not self.ignore(name):
outputs.append(name)
if self.atimes < 2:
# Restore atimes of files we didn't access: not for any functional
# reason -- it's just to preserve the access time for the user's info
for name in deps:
originals.pop(name)
for name in originals:
original = originals[name]
if original != afters.get(name, None):
self._utime(name, original[0], original[1])
os.stat_float_times(old_stat_float) # restore stat_float_times value
return deps, outputs
def __call__(self, *args, **kwargs):
""" Run command and return its dependencies and outputs, using before
and after access times to determine dependencies. """
# For Python pre-2.5, ensure os.stat() returns float atimes
old_stat_float = os.stat_float_times()
os.stat_float_times(True)
originals = self.file_times()
if self.atimes == 2:
befores = originals
atime_resolution = 0
mtime_resolution = 0
else:
befores = self._age_atimes(originals)
atime_resolution = FAT_atime_resolution
mtime_resolution = FAT_mtime_resolution
shell_keywords = dict(silent=False)
shell_keywords.update(kwargs)
shell(*args, **shell_keywords)
afters = self.file_times()
deps = []
outputs = []
for name in afters:
if name in befores:
# if file exists before+after && mtime changed, add to outputs
# Note: Can't just check that atimes > than we think they were
# before because os might have rounded them to a later
# date than what we think we set them to in befores.
# So we make sure they're > by at least 1/2 the
# resolution. This will work for anything with a
# resolution better than FAT.
if afters[name][1]-mtime_resolution/2 > befores[name][1]:
if not self.ignore(name):
outputs.append(name)
elif afters[name][0]-atime_resolution/2 > befores[name][0]:
# otherwise add to deps if atime changed
if not self.ignore(name):
deps.append(name)
else:
# file created (in afters but not befores), add as output
if not self.ignore(name):
outputs.append(name)
if self.atimes < 2:
# Restore atimes of files we didn't access: not for any functional
# reason -- it's just to preserve the access time for the user's info
for name in deps:
originals.pop(name)
for name in originals:
original = originals[name]
if original != afters.get(name, None):
self._utime(name, original[0], original[1])
os.stat_float_times(old_stat_float) # restore stat_float_times value
return deps, outputs
def __call__(self, *args, **kwargs):
""" Run command and return its dependencies and outputs, using before
and after access times to determine dependencies. """
# For Python pre-2.5, ensure os.stat() returns float atimes
old_stat_float = os.stat_float_times()
os.stat_float_times(True)
originals = self.file_times()
if self.atimes == 2:
befores = originals
atime_resolution = 0
mtime_resolution = 0
else:
befores = self._age_atimes(originals)
atime_resolution = FAT_atime_resolution
mtime_resolution = FAT_mtime_resolution
shell_keywords = dict(silent=False)
shell_keywords.update(kwargs)
shell(*args, **shell_keywords)
afters = self.file_times()
deps = []
outputs = []
for name in afters:
if name in befores:
# if file exists before+after && mtime changed, add to outputs
# Note: Can't just check that atimes > than we think they were
# before because os might have rounded them to a later
# date than what we think we set them to in befores.
# So we make sure they're > by at least 1/2 the
# resolution. This will work for anything with a
# resolution better than FAT.
if afters[name][1]-mtime_resolution/2 > befores[name][1]:
if not self.ignore(name):
outputs.append(name)
elif afters[name][0]-atime_resolution/2 > befores[name][0]:
# otherwise add to deps if atime changed
if not self.ignore(name):
deps.append(name)
else:
# file created (in afters but not befores), add as output
if not self.ignore(name):
outputs.append(name)
if self.atimes < 2:
# Restore atimes of files we didn't access: not for any functional
# reason -- it's just to preserve the access time for the user's info
for name in deps:
originals.pop(name)
for name in originals:
original = originals[name]
if original != afters.get(name, None):
self._utime(name, original[0], original[1])
os.stat_float_times(old_stat_float) # restore stat_float_times value
return deps, outputs