def _process_tRNS(self, data):
# http://www.w3.org/TR/PNG/#11tRNS
self.trns = data
if self.colormap:
if not self.plte:
warnings.warn("PLTE chunk is required before tRNS chunk.")
else:
if len(data) > len(self.plte)/3:
# Was warning, but promoted to Error as it
# would otherwise cause pain later on.
raise FormatError("tRNS chunk is too long.")
else:
if self.alpha:
raise FormatError(
"tRNS chunk is not valid with colour type %d." %
self.color_type)
try:
self.transparent = \
struct.unpack("!%dH" % self.color_planes, data)
except struct.error:
raise FormatError("tRNS chunk has incorrect length.")
python类warn()的实例源码
def get_key(dotenv_path, key_to_get):
"""
Gets the value of a given key from the given .env
If the .env path given doesn't exist, fails
"""
key_to_get = str(key_to_get)
if not os.path.exists(dotenv_path):
warnings.warn("can't read %s - it doesn't exist." % dotenv_path)
return None
dotenv_as_dict = dotenv_values(dotenv_path)
if key_to_get in dotenv_as_dict:
return dotenv_as_dict[key_to_get]
else:
warnings.warn("key %s not found in %s." % (key_to_get, dotenv_path))
return None
def set_key(dotenv_path, key_to_set, value_to_set, quote_mode="always"):
"""
Adds or Updates a key/value to the given .env
If the .env path given doesn't exist, fails instead of risking creating
an orphan .env somewhere in the filesystem
"""
key_to_set = str(key_to_set)
value_to_set = str(value_to_set).strip("'").strip('"')
if not os.path.exists(dotenv_path):
warnings.warn("can't write to %s - it doesn't exist." % dotenv_path)
return None, key_to_set, value_to_set
dotenv_as_dict = OrderedDict(parse_dotenv(dotenv_path))
dotenv_as_dict[key_to_set] = value_to_set
success = flatten_and_write(dotenv_path, dotenv_as_dict, quote_mode)
return success, key_to_set, value_to_set
def unset_key(dotenv_path, key_to_unset, quote_mode="always"):
"""
Removes a given key from the given .env
If the .env path given doesn't exist, fails
If the given key doesn't exist in the .env, fails
"""
key_to_unset = str(key_to_unset)
if not os.path.exists(dotenv_path):
warnings.warn("can't delete from %s - it doesn't exist." % dotenv_path)
return None, key_to_unset
dotenv_as_dict = dotenv_values(dotenv_path)
if key_to_unset in dotenv_as_dict:
dotenv_as_dict.pop(key_to_unset, None)
else:
warnings.warn("key %s not removed from %s - key doesn't exist." % (key_to_unset, dotenv_path))
return None, key_to_unset
success = flatten_and_write(dotenv_path, dotenv_as_dict, quote_mode)
return success, key_to_unset
def __init__(self, headers=None, retries=None, validate_certificate=True,
urlfetch_retries=True):
if not urlfetch:
raise AppEnginePlatformError(
"URLFetch is not available in this environment.")
if is_prod_appengine_mvms():
raise AppEnginePlatformError(
"Use normal urllib3.PoolManager instead of AppEngineManager"
"on Managed VMs, as using URLFetch is not necessary in "
"this environment.")
warnings.warn(
"urllib3 is using URLFetch on Google App Engine sandbox instead "
"of sockets. To use sockets directly instead of URLFetch see "
"https://urllib3.readthedocs.io/en/latest/reference/urllib3.contrib.html.",
AppEnginePlatformWarning)
RequestMethods.__init__(self, headers)
self.validate_certificate = validate_certificate
self.urlfetch_retries = urlfetch_retries
self.retries = retries or Retry.DEFAULT
def _validate_conn(self, conn):
"""
Called right before a request is made, after the socket is created.
"""
super(HTTPSConnectionPool, self)._validate_conn(conn)
# Force connect early to allow us to validate the connection.
if not getattr(conn, 'sock', None): # AppEngine might not have `.sock`
conn.connect()
if not conn.is_verified:
warnings.warn((
'Unverified HTTPS request is being made. '
'Adding certificate verification is strongly advised. See: '
'https://urllib3.readthedocs.io/en/latest/advanced-usage.html'
'#ssl-warnings'),
InsecureRequestWarning)
def wrap_socket(self, socket, server_hostname=None, server_side=False):
warnings.warn(
'A true SSLContext object is not available. This prevents '
'urllib3 from configuring SSL appropriately and may cause '
'certain SSL connections to fail. You can upgrade to a newer '
'version of Python to solve this. For more information, see '
'https://urllib3.readthedocs.io/en/latest/advanced-usage.html'
'#ssl-warnings',
InsecurePlatformWarning
)
kwargs = {
'keyfile': self.keyfile,
'certfile': self.certfile,
'ca_certs': self.ca_certs,
'cert_reqs': self.verify_mode,
'ssl_version': self.protocol,
'server_side': server_side,
}
if self.supports_set_ciphers: # Platform-specific: Python 2.7+
return wrap_socket(socket, ciphers=self.ciphers, **kwargs)
else: # Platform-specific: Python 2.6
return wrap_socket(socket, **kwargs)
def __add__(self, other ):
"""
Implementation of + operator - returns C{L{And}}. Adding strings to a ParserElement
converts them to L{Literal}s by default.
Example::
greet = Word(alphas) + "," + Word(alphas) + "!"
hello = "Hello, World!"
print (hello, "->", greet.parseString(hello))
Prints::
Hello, World! -> ['Hello', ',', 'World', '!']
"""
if isinstance( other, basestring ):
other = ParserElement._literalStringClass( other )
if not isinstance( other, ParserElement ):
warnings.warn("Cannot combine element of type %s with ParserElement" % type(other),
SyntaxWarning, stacklevel=2)
return None
return And( [ self, other ] )
def __init__( self, matchString ):
super(Literal,self).__init__()
self.match = matchString
self.matchLen = len(matchString)
try:
self.firstMatchChar = matchString[0]
except IndexError:
warnings.warn("null string passed to Literal; use Empty() instead",
SyntaxWarning, stacklevel=2)
self.__class__ = Empty
self.name = '"%s"' % _ustr(self.match)
self.errmsg = "Expected " + self.name
self.mayReturnEmpty = False
self.mayIndexError = False
# Performance tuning: this routine gets called a *lot*
# if this is a single character match string and the first character matches,
# short-circuit as quickly as possible, and avoid calling startswith
#~ @profile
def __init__( self, matchString, identChars=None, caseless=False ):
super(Keyword,self).__init__()
if identChars is None:
identChars = Keyword.DEFAULT_KEYWORD_CHARS
self.match = matchString
self.matchLen = len(matchString)
try:
self.firstMatchChar = matchString[0]
except IndexError:
warnings.warn("null string passed to Keyword; use Empty() instead",
SyntaxWarning, stacklevel=2)
self.name = '"%s"' % self.match
self.errmsg = "Expected " + self.name
self.mayReturnEmpty = False
self.mayIndexError = False
self.caseless = caseless
if caseless:
self.caselessmatch = matchString.upper()
identChars = identChars.upper()
self.identChars = set(identChars)
def toXmlName(self, name):
nameFirst = name[0]
nameRest = name[1:]
m = nonXmlNameFirstBMPRegexp.match(nameFirst)
if m:
warnings.warn("Coercing non-XML name", DataLossWarning)
nameFirstOutput = self.getReplacementCharacter(nameFirst)
else:
nameFirstOutput = nameFirst
nameRestOutput = nameRest
replaceChars = set(nonXmlNameBMPRegexp.findall(nameRest))
for char in replaceChars:
warnings.warn("Coercing non-XML name", DataLossWarning)
replacement = self.getReplacementCharacter(char)
nameRestOutput = nameRestOutput.replace(char, replacement)
return nameFirstOutput + nameRestOutput
def _warn_unsafe_extraction_path(path):
"""
If the default extraction path is overridden and set to an insecure
location, such as /tmp, it opens up an opportunity for an attacker to
replace an extracted file with an unauthorized payload. Warn the user
if a known insecure location is used.
See Distribute #375 for more details.
"""
if os.name == 'nt' and not path.startswith(os.environ['windir']):
# On Windows, permissions are generally restrictive by default
# and temp directories are not writable by other users, so
# bypass the warning.
return
mode = os.stat(path).st_mode
if mode & stat.S_IWOTH or mode & stat.S_IWGRP:
msg = ("%s is writable by group/others and vulnerable to attack "
"when "
"used with get_resource_filename. Consider a more secure "
"location (set with .set_extraction_path or the "
"PYTHON_EGG_CACHE environment variable)." % path)
warnings.warn(msg, UserWarning)
def _warn_legacy_version(self):
LV = packaging.version.LegacyVersion
is_legacy = isinstance(self._parsed_version, LV)
if not is_legacy:
return
# While an empty version is technically a legacy version and
# is not a valid PEP 440 version, it's also unlikely to
# actually come from someone and instead it is more likely that
# it comes from setuptools attempting to parse a filename and
# including it in the list. So for that we'll gate this warning
# on if the version is anything at all or not.
if not self.version:
return
tmpl = textwrap.dedent("""
'{project_name} ({version})' is being parsed as a legacy,
non PEP 440,
version. You may find odd behavior and sort order.
In particular it will be sorted as less than 0.0. It
is recommended to migrate to PEP 440 compatible
versions.
""").strip().replace('\n', ' ')
warnings.warn(tmpl.format(**vars(self)), PEP440Warning)
def _dep_map(self):
try:
return self.__dep_map
except AttributeError:
dm = self.__dep_map = {None: []}
for name in 'requires.txt', 'depends.txt':
for extra, reqs in split_sections(self._get_metadata(name)):
if extra:
if ':' in extra:
extra, marker = extra.split(':', 1)
if invalid_marker(marker):
# XXX warn
reqs = []
elif not evaluate_marker(marker):
reqs = []
extra = safe_extra(extra) or None
dm.setdefault(extra, []).extend(parse_requirements(reqs))
return dm
def __init__(self, headers=None, retries=None, validate_certificate=True):
if not urlfetch:
raise AppEnginePlatformError(
"URLFetch is not available in this environment.")
if is_prod_appengine_mvms():
raise AppEnginePlatformError(
"Use normal urllib3.PoolManager instead of AppEngineManager"
"on Managed VMs, as using URLFetch is not necessary in "
"this environment.")
warnings.warn(
"urllib3 is using URLFetch on Google App Engine sandbox instead "
"of sockets. To use sockets directly instead of URLFetch see "
"https://urllib3.readthedocs.io/en/latest/contrib.html.",
AppEnginePlatformWarning)
RequestMethods.__init__(self, headers)
self.validate_certificate = validate_certificate
self.retries = retries or Retry.DEFAULT
def _validate_conn(self, conn):
"""
Called right before a request is made, after the socket is created.
"""
super(HTTPSConnectionPool, self)._validate_conn(conn)
# Force connect early to allow us to validate the connection.
if not getattr(conn, 'sock', None): # AppEngine might not have `.sock`
conn.connect()
if not conn.is_verified:
warnings.warn((
'Unverified HTTPS request is being made. '
'Adding certificate verification is strongly advised. See: '
'https://urllib3.readthedocs.io/en/latest/security.html'),
InsecureRequestWarning)
def wrap_socket(self, socket, server_hostname=None, server_side=False):
warnings.warn(
'A true SSLContext object is not available. This prevents '
'urllib3 from configuring SSL appropriately and may cause '
'certain SSL connections to fail. You can upgrade to a newer '
'version of Python to solve this. For more information, see '
'https://urllib3.readthedocs.io/en/latest/security.html'
'#insecureplatformwarning.',
InsecurePlatformWarning
)
kwargs = {
'keyfile': self.keyfile,
'certfile': self.certfile,
'ca_certs': self.ca_certs,
'cert_reqs': self.verify_mode,
'ssl_version': self.protocol,
'server_side': server_side,
}
if self.supports_set_ciphers: # Platform-specific: Python 2.7+
return wrap_socket(socket, ciphers=self.ciphers, **kwargs)
else: # Platform-specific: Python 2.6
return wrap_socket(socket, **kwargs)
def check_install_build_global(options, check_options=None):
"""Disable wheels if per-setup.py call options are set.
:param options: The OptionParser options to update.
:param check_options: The options to check, if not supplied defaults to
options.
"""
if check_options is None:
check_options = options
def getname(n):
return getattr(check_options, n, None)
names = ["build_options", "global_options", "install_options"]
if any(map(getname, names)):
control = options.format_control
fmt_ctl_no_binary(control)
warnings.warn(
'Disabling all use of wheels due to the use of --build-options '
'/ --global-options / --install-options.', stacklevel=2)
###########
# options #
###########
def __add__(self, other ):
"""
Implementation of + operator - returns C{L{And}}. Adding strings to a ParserElement
converts them to L{Literal}s by default.
Example::
greet = Word(alphas) + "," + Word(alphas) + "!"
hello = "Hello, World!"
print (hello, "->", greet.parseString(hello))
Prints::
Hello, World! -> ['Hello', ',', 'World', '!']
"""
if isinstance( other, basestring ):
other = ParserElement._literalStringClass( other )
if not isinstance( other, ParserElement ):
warnings.warn("Cannot combine element of type %s with ParserElement" % type(other),
SyntaxWarning, stacklevel=2)
return None
return And( [ self, other ] )
def __init__( self, matchString ):
super(Literal,self).__init__()
self.match = matchString
self.matchLen = len(matchString)
try:
self.firstMatchChar = matchString[0]
except IndexError:
warnings.warn("null string passed to Literal; use Empty() instead",
SyntaxWarning, stacklevel=2)
self.__class__ = Empty
self.name = '"%s"' % _ustr(self.match)
self.errmsg = "Expected " + self.name
self.mayReturnEmpty = False
self.mayIndexError = False
# Performance tuning: this routine gets called a *lot*
# if this is a single character match string and the first character matches,
# short-circuit as quickly as possible, and avoid calling startswith
#~ @profile
