requests.models.PreparedRequest

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    def prepare_request(self, request):
        """Constructs a :class:`PreparedRequest <PreparedRequest>` for
        transmission and returns it. The :class:`PreparedRequest` has settings
        merged from the :class:`Request <Request>` instance and those of the
        :class:`Session`.

        :param request: :class:`Request` instance to prepare with this
                        session's settings.
        """
        cookies = request.cookies or {}

        # Bootstrap CookieJar.
        if not isinstance(cookies, cookielib.CookieJar):
            cookies = cookiejar_from_dict(cookies)

        # Merge with session cookies
        merged_cookies = RequestsCookieJar()
        merged_cookies.update(self.cookies)
        merged_cookies.update(cookies)


        # Set environment's basic authentication if not explicitly set.
        auth = request.auth
        if self.trust_env and not auth and not self.auth:
            auth = get_netrc_auth(request.url)

        p = PreparedRequest()
        p.prepare(
            method=request.method.upper(),
            url=request.url,
            files=request.files,
            data=request.data,
            headers=merge_setting(request.headers, self.headers, dict_class=CaseInsensitiveDict),
            params=merge_setting(request.params, self.params),
            auth=merge_setting(auth, self.auth),
            cookies=merged_cookies,
            hooks=merge_hooks(request.hooks, self.hooks),
        )
        return p

    def build(self, **kwargs):
        """
        Build an url with the given arguments from URL's regexps.

        :param param: Query string parameters

        :rtype: :class:`str`
        :raises: :class:`UrlNotResolvable` if unable to resolve a correct url with the given arguments.
        """
        browser = kwargs.pop('browser', self.browser)
        params = kwargs.pop('params', None)
        patterns = []
        for url in self.urls:
            patterns += normalize(url)

        for pattern, _ in patterns:
            url = pattern
            # only use full-name substitutions, to allow % in URLs
            args = kwargs.copy()
            for key in args.keys():  # need to use keys() because of pop()
                search = '%%(%s)s' % key
                if search in pattern:
                    url = url.replace(search, unicode(args.pop(key)))
            # if there are named substitutions left, ignore pattern
            if re.search('%\([A-z_]+\)s', url):
                continue
            # if not all args were used
            if len(args):
                continue

            url = browser.absurl(url, base=True)
            if params:
                p = requests.models.PreparedRequest()
                p.prepare_url(url, params)
                url = p.url
            return url

        raise UrlNotResolvable('Unable to resolve URL with %r. Available are %s' % (kwargs, ', '.join([pattern for pattern, _ in patterns])))

    def prepare_request(self, request):
        """Constructs a :class:`PreparedRequest <PreparedRequest>` for
        transmission and returns it. The :class:`PreparedRequest` has settings
        merged from the :class:`Request <Request>` instance and those of the
        :class:`Session`.

        :param request: :class:`Request` instance to prepare with this
                        session's settings.
        """
        cookies = request.cookies or {}

        # Bootstrap CookieJar.
        if not isinstance(cookies, cookielib.CookieJar):
            cookies = cookiejar_from_dict(cookies)

        # Merge with session cookies
        merged_cookies = RequestsCookieJar()
        merged_cookies.update(self.cookies)
        merged_cookies.update(cookies)


        # Set environment's basic authentication if not explicitly set.
        auth = request.auth
        if self.trust_env and not auth and not self.auth:
            auth = get_netrc_auth(request.url)

        p = PreparedRequest()
        p.prepare(
            method=request.method.upper(),
            url=request.url,
            files=request.files,
            data=request.data,
            headers=merge_setting(request.headers, self.headers, dict_class=CaseInsensitiveDict),
            params=merge_setting(request.params, self.params),
            auth=merge_setting(auth, self.auth),
            cookies=merged_cookies,
            hooks=merge_hooks(request.hooks, self.hooks),
        )
        return p

    def build(self, **kwargs):
        """
        Build an url with the given arguments from URL's regexps.

        :param param: Query string parameters

        :rtype: :class:`str`
        :raises: :class:`UrlNotResolvable` if unable to resolve a correct url with the given arguments.
        """
        browser = kwargs.pop('browser', self.browser)
        params = kwargs.pop('params', None)
        patterns = []
        for url in self.urls:
            patterns += normalize(url)

        for pattern, _ in patterns:
            url = pattern
            # only use full-name substitutions, to allow % in URLs
            args = kwargs.copy()
            for key in args.keys():  # need to use keys() because of pop()
                search = '%%(%s)s' % key
                if search in pattern:
                    url = url.replace(search, unicode(args.pop(key)))
            # if there are named substitutions left, ignore pattern
            if re.search('%\([A-z_]+\)s', url):
                continue
            # if not all args were used
            if len(args):
                continue

            url = browser.absurl(url, base=True)
            if params:
                p = requests.models.PreparedRequest()
                p.prepare_url(url, params)
                url = p.url
            return url

        raise UrlNotResolvable('Unable to resolve URL with %r. Available are %s' % (kwargs, ', '.join([pattern for pattern, _ in patterns])))