def test_no_inherit_future(self):
     # This file has from __future__ import print_function...
     f = StringIO()
     print('hello', file=f)
     # ...but the template doesn't
     exec_in('print >> f, "world"', dict(f=f))
     self.assertEqual(f.getvalue(), 'hello\nworld\n')

 def generate_async(self, **kwargs):
     namespace = self._get_namespace(**kwargs)
     exec_in(self.compiled, namespace)
     execute = gen.coroutine(namespace["_tt_execute"])
     linecache.clearcache()
     result = yield execute()
     return result

 def generate(self, **kwargs):
     """Generate this template with the given arguments."""
     namespace = {
         "escape": escape.xhtml_escape,
         "xhtml_escape": escape.xhtml_escape,
         "url_escape": escape.url_escape,
         "json_encode": escape.json_encode,
         "squeeze": escape.squeeze,
         "linkify": escape.linkify,
         "datetime": datetime,
         "_tt_utf8": escape.utf8,  # for internal use
         "_tt_string_types": (unicode_type, bytes_type),
         # __name__ and __loader__ allow the traceback mechanism to find
         # the generated source code.
         "__name__": self.name.replace(".", "_"),
         "__loader__": ObjectDict(get_source=lambda name: self.code),
     }
     namespace.update(self.namespace)
     namespace.update(kwargs)
     exec_in(self.compiled, namespace)
     execute = namespace["_tt_execute"]
     # Clear the traceback module's cache of source data now that
     # we've generated a new template (mainly for this module's
     # unittests, where different tests reuse the same name).
     linecache.clearcache()
     return execute()

    def parse_config_file(self, path, final=True):
        """Parses and loads the Python config file at the given path.

        If ``final`` is ``False``, parse callbacks will not be run.
        This is useful for applications that wish to combine configurations
        from multiple sources.

        .. versionchanged:: 4.1
           Config files are now always interpreted as utf-8 instead of
           the system default encoding.

        .. versionchanged:: 4.4
           The special variable ``__file__`` is available inside config
           files, specifying the absolute path to the config file itself.
        """
        config = {'__file__': os.path.abspath(path)}
        with open(path, 'rb') as f:
            exec_in(native_str(f.read()), config, config)
        for name in config:
            normalized = self._normalize_name(name)
            if normalized in self._options:
                self._options[normalized].set(config[name])

        if final:
            self.run_parse_callbacks()

def config_from_file(path, final=True):
    config = {}
    with open(path) as f:
        exec_in(f.read(), config, config)
    for name in config:
        if not name in options._options:
            define(name)
        options._options[name].set(str(config[name]))

def parse_config_file(path):
    config = {}
    with open(path) as f:
        exec_in(f.read(), config, config)
    for name in config:
        if name in options._options:
            options._options[name].set(config[name])
        else:
            define(name, config[name])

 def generate(self, **kwargs):
     """Generate this template with the given arguments."""
     namespace = self._get_namespace(**kwargs)
     exec_in(self.compiled, namespace)
     execute = namespace["_tt_execute"]
     # Clear the traceback module's cache of source data now that
     # we've generated a new template (mainly for this module's
     # unittests, where different tests reuse the same name).
     linecache.clearcache()
     return execute()

 def _fetch_existing_config(self):
     # We could use tornado.options.OptionParser, but we would have to
     # define the options before reading the file. Instead, we use code
     # that is similar to that in tornado.
     path = self.settings.config_path.web
     #NOTE This code is copied from tornado. Therefore, the license of
     #     tornado applies (Apache License 2.0).
     config = {}
     with open(path) as f:
         exec_in(f.read(), config, config)
     return config

    def parse_config_file(self, path, final=True):
        """Parses and loads the config file at the given path.

        The config file contains Python code that will be executed (so
        it is **not safe** to use untrusted config files). Anything in
        the global namespace that matches a defined option will be
        used to set that option's value.

        Options are not parsed from strings as they would be on the
        command line; they should be set to the correct type (this
        means if you have ``datetime`` or ``timedelta`` options you
        will need to import those modules in the config file.

        Example (using the options defined in the top-level docs of
        this module)::

            port = 80
            mysql_host = 'mydb.example.com:3306'
            memcache_hosts = ['cache1.example.com:11011',
                              'cache2.example.com:11011']

        If ``final`` is ``False``, parse callbacks will not be run.
        This is useful for applications that wish to combine configurations
        from multiple sources.

        .. note::

            `tornado.options` is primarily a command-line library.
            Config file support is provided for applications that wish
            to use it, but applications that prefer config files may
            wish to look at other libraries instead.

        .. versionchanged:: 4.1
           Config files are now always interpreted as utf-8 instead of
           the system default encoding.

        .. versionchanged:: 4.4
           The special variable ``__file__`` is available inside config
           files, specifying the absolute path to the config file itself.

        """
        config = {'__file__': os.path.abspath(path)}
        with open(path, 'rb') as f:
            exec_in(native_str(f.read()), config, config)
        for name in config:
            normalized = self._normalize_name(name)
            if normalized in self._options:
                self._options[normalized].set(config[name])

        if final:
            self.run_parse_callbacks()

    def parse_config_file(self, path, final=True):
        """Parses and loads the Python config file at the given path.

        If ``final`` is ``False``, parse callbacks will not be run.
        This is useful for applications that wish to combine configurations
        from multiple sources.
        """
        config = {}
        with open(path) as f:
            exec_in(f.read(), config, config)
        for name in config:
            if name in self._options:
                self._options[name].set(config[name])

        if final:
            self.run_parse_callbacks()

def parse_config_file(path, final=True):

    """Parses and loads the Python config file at the given path.

    This version allow customize new options which are not defined before
    from a configuration file.
    """
    config = {}
    with open(path, 'rb') as f:
        exec_in(native_str(f.read()), {}, config)
    for name in config:
        normalized = options._normalize_name(name)
        if normalized in options._options:
            options._options[normalized].set(config[name])
        else:
            tornado.options.define(name, config[name])
    if final:
        options.run_parse_callbacks()

def define_options(default_conf):
    """
    Define the options from default.conf dynamically
    """
    default = {}
    with open(default_conf, 'rb') as f:
        exec_in(native_str(f.read()), {}, default)

    for name, value in default.iteritems():
        # if the option is already defined by tornado
        # override the value
        # a list of options set by tornado:
        # log_file_num_backups, logging, help,
        # log_to_stderr, log_file_max_size, log_file_prefix
        if name in options:
            setattr(options, name, value)
        # otherwise define the option
        else:
            define(name, value)

    def parse_config_file(self, path, final=True):
        """Parses and loads the Python config file at the given path.

        If ``final`` is ``False``, parse callbacks will not be run.
        This is useful for applications that wish to combine configurations
        from multiple sources.

        .. versionchanged:: 4.1
           Config files are now always interpreted as utf-8 instead of
           the system default encoding.
        """
        config = {}
        with open(path, 'rb') as f:
            exec_in(native_str(f.read()), config, config)
        for name in config:
            if name in self._options:
                self._options[name].set(config[name])

        if final:
            self.run_parse_callbacks()

    def parse_config_file(self, path, final=True):
        """Parses and loads the config file at the given path.

        The config file contains Python code that will be executed (so
        it is **not safe** to use untrusted config files). Anything in
        the global namespace that matches a defined option will be
        used to set that option's value.

        Options may either be the specified type for the option or
        strings (in which case they will be parsed the same way as in
        `.parse_command_line`)

        Example (using the options defined in the top-level docs of
        this module)::

            port = 80
            mysql_host = 'mydb.example.com:3306'
            # Both lists and comma-separated strings are allowed for
            # multiple=True.
            memcache_hosts = ['cache1.example.com:11011',
                              'cache2.example.com:11011']
            memcache_hosts = 'cache1.example.com:11011,cache2.example.com:11011'

        If ``final`` is ``False``, parse callbacks will not be run.
        This is useful for applications that wish to combine configurations
        from multiple sources.

        .. note::

            `tornado.options` is primarily a command-line library.
            Config file support is provided for applications that wish
            to use it, but applications that prefer config files may
            wish to look at other libraries instead.

        .. versionchanged:: 4.1
           Config files are now always interpreted as utf-8 instead of
           the system default encoding.

        .. versionchanged:: 4.4
           The special variable ``__file__`` is available inside config
           files, specifying the absolute path to the config file itself.

        .. versionchanged:: 5.1
           Added the ability to set options via strings in config files.

        """
        config = {'__file__': os.path.abspath(path)}
        with open(path, 'rb') as f:
            exec_in(native_str(f.read()), config, config)
        for name in config:
            normalized = self._normalize_name(name)
            if normalized in self._options:
                option = self._options[normalized]
                if option.multiple:
                    if not isinstance(config[name], (list, str)):
                        raise Error("Option %r is required to be a list of %s "
                                    "or a comma-separated string" %
                                    (option.name, option.type.__name__))

                if type(config[name]) == str and option.type != str:
                    option.parse(config[name])
                else:
                    option.set(config[name])

        if final:
            self.run_parse_callbacks()

def main():
    """Command-line wrapper to re-run a script whenever its source changes.

    Scripts may be specified by filename or module name::

        python -m tornado.autoreload -m tornado.test.runtests
        python -m tornado.autoreload tornado/test/runtests.py

    Running a script with this wrapper is similar to calling
    `tornado.autoreload.wait` at the end of the script, but this wrapper
    can catch import-time problems like syntax errors that would otherwise
    prevent the script from reaching its call to `wait`.
    """
    original_argv = sys.argv
    sys.argv = sys.argv[:]
    if len(sys.argv) >= 3 and sys.argv[1] == "-m":
        mode = "module"
        module = sys.argv[2]
        del sys.argv[1:3]
    elif len(sys.argv) >= 2:
        mode = "script"
        script = sys.argv[1]
        sys.argv = sys.argv[1:]
    else:
        print(_USAGE, file=sys.stderr)
        sys.exit(1)

    try:
        if mode == "module":
            import runpy
            runpy.run_module(module, run_name="__main__", alter_sys=True)
        elif mode == "script":
            with open(script) as f:
                global __file__
                __file__ = script
                # Use globals as our "locals" dictionary so that
                # something that tries to import __main__ (e.g. the unittest
                # module) will see the right things.
                exec_in(f.read(), globals(), globals())
    except SystemExit as e:
        logging.basicConfig()
        gen_log.info("Script exited with status %s", e.code)
    except Exception as e:
        logging.basicConfig()
        gen_log.warning("Script exited with uncaught exception", exc_info=True)
        # If an exception occurred at import time, the file with the error
        # never made it into sys.modules and so we won't know to watch it.
        # Just to make sure we've covered everything, walk the stack trace
        # from the exception and watch every file.
        for (filename, lineno, name, line) in traceback.extract_tb(sys.exc_info()[2]):
            watch(filename)
        if isinstance(e, SyntaxError):
            # SyntaxErrors are special:  their innermost stack frame is fake
            # so extract_tb won't see it and we have to get the filename
            # from the exception object.
            watch(e.filename)
    else:
        logging.basicConfig()
        gen_log.info("Script exited normally")
    # restore sys.argv so subsequent executions will include autoreload
    sys.argv = original_argv

    if mode == 'module':
        # runpy did a fake import of the module as __main__, but now it's
        # no longer in sys.modules.  Figure out where it is and watch it.
        loader = pkgutil.get_loader(module)
        if loader is not None:
            watch(loader.get_filename())

    wait()

def main():
    """Command-line wrapper to re-run a script whenever its source changes.

    Scripts may be specified by filename or module name::

        python -m tornado.autoreload -m tornado.test.runtests
        python -m tornado.autoreload tornado/test/runtests.py

    Running a script with this wrapper is similar to calling
    `tornado.autoreload.wait` at the end of the script, but this wrapper
    can catch import-time problems like syntax errors that would otherwise
    prevent the script from reaching its call to `wait`.
    """
    # Remember that we were launched with autoreload as main.
    # The main module can be tricky; set the variables both in our globals
    # (which may be __main__) and the real importable version.
    import tornado.autoreload
    global _autoreload_is_main
    global _original_argv, _original_spec
    tornado.autoreload._autoreload_is_main = _autoreload_is_main = True
    original_argv = sys.argv
    tornado.autoreload._original_argv = _original_argv = original_argv
    original_spec = getattr(sys.modules['__main__'], '__spec__', None)
    tornado.autoreload._original_spec = _original_spec = original_spec
    sys.argv = sys.argv[:]
    if len(sys.argv) >= 3 and sys.argv[1] == "-m":
        mode = "module"
        module = sys.argv[2]
        del sys.argv[1:3]
    elif len(sys.argv) >= 2:
        mode = "script"
        script = sys.argv[1]
        sys.argv = sys.argv[1:]
    else:
        print(_USAGE, file=sys.stderr)
        sys.exit(1)

    try:
        if mode == "module":
            import runpy
            runpy.run_module(module, run_name="__main__", alter_sys=True)
        elif mode == "script":
            with open(script) as f:
                # Execute the script in our namespace instead of creating
                # a new one so that something that tries to import __main__
                # (e.g. the unittest module) will see names defined in the
                # script instead of just those defined in this module.
                global __file__
                __file__ = script
                # If __package__ is defined, imports may be incorrectly
                # interpreted as relative to this module.
                global __package__
                del __package__
                exec_in(f.read(), globals(), globals())
    except SystemExit as e:
        logging.basicConfig()
        gen_log.info("Script exited with status %s", e.code)
    except Exception as e:
        logging.basicConfig()
        gen_log.warning("Script exited with uncaught exception", exc_info=True)
        # If an exception occurred at import time, the file with the error
        # never made it into sys.modules and so we won't know to watch it.
        # Just to make sure we've covered everything, walk the stack trace
        # from the exception and watch every file.
        for (filename, lineno, name, line) in traceback.extract_tb(sys.exc_info()[2]):
            watch(filename)
        if isinstance(e, SyntaxError):
            # SyntaxErrors are special:  their innermost stack frame is fake
            # so extract_tb won't see it and we have to get the filename
            # from the exception object.
            watch(e.filename)
    else:
        logging.basicConfig()
        gen_log.info("Script exited normally")
    # restore sys.argv so subsequent executions will include autoreload
    sys.argv = original_argv

    if mode == 'module':
        # runpy did a fake import of the module as __main__, but now it's
        # no longer in sys.modules.  Figure out where it is and watch it.
        loader = pkgutil.get_loader(module)
        if loader is not None:
            watch(loader.get_filename())

    wait()