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  3. jinja2.nodes.Impossible()

Python jinja2.nodes 模块，Impossible() 实例源码

我们从Python开源项目中，提取了以下50个代码示例，用于说明如何使用jinja2.nodes.Impossible()。

项目：Flask_Blog    作者：sugarguo    | 项目源码 | 文件源码 
def visit_If(self, node):
        """Eliminate dead code."""
        # do not optimize ifs that have a block inside so that it doesn't
        # break super().
        if node.find(nodes.Block) is not None:
            return self.generic_visit(node)
        try:
            val = self.visit(node.test).as_const()
        except nodes.Impossible:
            return self.generic_visit(node)
        if val:
            body = node.body
        else:
            body = node.else_
        result = []
        for node in body:
            result.extend(self.visit_list(node))
        return result
项目：swjtu-pyscraper    作者：Desgard    | 项目源码 | 文件源码 
def visit_If(self, node):
        """Eliminate dead code."""
        # do not optimize ifs that have a block inside so that it doesn't
        # break super().
        if node.find(nodes.Block) is not None:
            return self.generic_visit(node)
        try:
            val = self.visit(node.test).as_const()
        except nodes.Impossible:
            return self.generic_visit(node)
        if val:
            body = node.body
        else:
            body = node.else_
        result = []
        for node in body:
            result.extend(self.visit_list(node))
        return result
项目：sublime-text-3-packages    作者：nickjj    | 项目源码 | 文件源码 
def visit_If(self, node):
        """Eliminate dead code."""
        # do not optimize ifs that have a block inside so that it doesn't
        # break super().
        if node.find(nodes.Block) is not None:
            return self.generic_visit(node)
        try:
            val = self.visit(node.test).as_const()
        except nodes.Impossible:
            return self.generic_visit(node)
        if val:
            body = node.body
        else:
            body = node.else_
        result = []
        for node in body:
            result.extend(self.visit_list(node))
        return result
项目：zanph    作者：zanph    | 项目源码 | 文件源码 
def visit_If(self, node):
        """Eliminate dead code."""
        # do not optimize ifs that have a block inside so that it doesn't
        # break super().
        if node.find(nodes.Block) is not None:
            return self.generic_visit(node)
        try:
            val = self.visit(node.test).as_const()
        except nodes.Impossible:
            return self.generic_visit(node)
        if val:
            body = node.body
        else:
            body = node.else_
        result = []
        for node in body:
            result.extend(self.visit_list(node))
        return result
项目：Texty    作者：sarthfrey    | 项目源码 | 文件源码 
def visit_If(self, node):
        """Eliminate dead code."""
        # do not optimize ifs that have a block inside so that it doesn't
        # break super().
        if node.find(nodes.Block) is not None:
            return self.generic_visit(node)
        try:
            val = self.visit(node.test).as_const()
        except nodes.Impossible:
            return self.generic_visit(node)
        if val:
            body = node.body
        else:
            body = node.else_
        result = []
        for node in body:
            result.extend(self.visit_list(node))
        return result
项目：isni-reconcile    作者：cmh2166    | 项目源码 | 文件源码 
def visit_If(self, node):
        """Eliminate dead code."""
        # do not optimize ifs that have a block inside so that it doesn't
        # break super().
        if node.find(nodes.Block) is not None:
            return self.generic_visit(node)
        try:
            val = self.visit(node.test).as_const()
        except nodes.Impossible:
            return self.generic_visit(node)
        if val:
            body = node.body
        else:
            body = node.else_
        result = []
        for node in body:
            result.extend(self.visit_list(node))
        return result
项目：flasky    作者：RoseOu    | 项目源码 | 文件源码 
def visit_If(self, node):
        """Eliminate dead code."""
        # do not optimize ifs that have a block inside so that it doesn't
        # break super().
        if node.find(nodes.Block) is not None:
            return self.generic_visit(node)
        try:
            val = self.visit(node.test).as_const()
        except nodes.Impossible:
            return self.generic_visit(node)
        if val:
            body = node.body
        else:
            body = node.else_
        result = []
        for node in body:
            result.extend(self.visit_list(node))
        return result
项目：macos-st-packages    作者：zce    | 项目源码 | 文件源码 
def visit_If(self, node):
        """Eliminate dead code."""
        # do not optimize ifs that have a block inside so that it doesn't
        # break super().
        if node.find(nodes.Block) is not None:
            return self.generic_visit(node)
        try:
            val = self.visit(node.test).as_const()
        except nodes.Impossible:
            return self.generic_visit(node)
        if val:
            body = node.body
        else:
            body = node.else_
        result = []
        for node in body:
            result.extend(self.visit_list(node))
        return result
项目：oa_qian    作者：sunqb    | 项目源码 | 文件源码 
def visit_If(self, node):
        """Eliminate dead code."""
        # do not optimize ifs that have a block inside so that it doesn't
        # break super().
        if node.find(nodes.Block) is not None:
            return self.generic_visit(node)
        try:
            val = self.visit(node.test).as_const()
        except nodes.Impossible:
            return self.generic_visit(node)
        if val:
            body = node.body
        else:
            body = node.else_
        result = []
        for node in body:
            result.extend(self.visit_list(node))
        return result
项目：chihu    作者：yelongyu    | 项目源码 | 文件源码 
def visit_If(self, node):
        """Eliminate dead code."""
        # do not optimize ifs that have a block inside so that it doesn't
        # break super().
        if node.find(nodes.Block) is not None:
            return self.generic_visit(node)
        try:
            val = self.visit(node.test).as_const()
        except nodes.Impossible:
            return self.generic_visit(node)
        if val:
            body = node.body
        else:
            body = node.else_
        result = []
        for node in body:
            result.extend(self.visit_list(node))
        return result
项目：pyetje    作者：rorlika    | 项目源码 | 文件源码 
def visit_If(self, node):
        """Eliminate dead code."""
        # do not optimize ifs that have a block inside so that it doesn't
        # break super().
        if node.find(nodes.Block) is not None:
            return self.generic_visit(node)
        try:
            val = self.visit(node.test).as_const()
        except nodes.Impossible:
            return self.generic_visit(node)
        if val:
            body = node.body
        else:
            body = node.else_
        result = []
        for node in body:
            result.extend(self.visit_list(node))
        return result
项目：tellmeabout.coffee    作者：billyfung    | 项目源码 | 文件源码 
def visit_If(self, node):
        """Eliminate dead code."""
        # do not optimize ifs that have a block inside so that it doesn't
        # break super().
        if node.find(nodes.Block) is not None:
            return self.generic_visit(node)
        try:
            val = self.visit(node.test).as_const()
        except nodes.Impossible:
            return self.generic_visit(node)
        if val:
            body = node.body
        else:
            body = node.else_
        result = []
        for node in body:
            result.extend(self.visit_list(node))
        return result
项目：bawk    作者：jttwnsnd    | 项目源码 | 文件源码 
def visit_If(self, node):
        """Eliminate dead code."""
        # do not optimize ifs that have a block inside so that it doesn't
        # break super().
        if node.find(nodes.Block) is not None:
            return self.generic_visit(node)
        try:
            val = self.visit(node.test).as_const()
        except nodes.Impossible:
            return self.generic_visit(node)
        if val:
            body = node.body
        else:
            body = node.else_
        result = []
        for node in body:
            result.extend(self.visit_list(node))
        return result
项目：infinite-lorem-ipsum    作者：patjm1992    | 项目源码 | 文件源码 
def visit_If(self, node):
        """Eliminate dead code."""
        # do not optimize ifs that have a block inside so that it doesn't
        # break super().
        if node.find(nodes.Block) is not None:
            return self.generic_visit(node)
        try:
            val = self.visit(node.test).as_const()
        except nodes.Impossible:
            return self.generic_visit(node)
        if val:
            body = node.body
        else:
            body = node.else_
        result = []
        for node in body:
            result.extend(self.visit_list(node))
        return result
项目：Price-Comparator    作者：Thejas-1    | 项目源码 | 文件源码 
def visit_If(self, node):
        """Eliminate dead code."""
        # do not optimize ifs that have a block inside so that it doesn't
        # break super().
        if node.find(nodes.Block) is not None:
            return self.generic_visit(node)
        try:
            val = self.visit(node.test).as_const()
        except nodes.Impossible:
            return self.generic_visit(node)
        if val:
            body = node.body
        else:
            body = node.else_
        result = []
        for node in body:
            result.extend(self.visit_list(node))
        return result
项目：download-manager    作者：thispc    | 项目源码 | 文件源码 
def visit_If(self, node):
        """Eliminate dead code."""
        # do not optimize ifs that have a block inside so that it doesn't
        # break super().
        if node.find(nodes.Block) is not None:
            return self.generic_visit(node)
        try:
            val = self.visit(node.test).as_const()
        except nodes.Impossible:
            return self.generic_visit(node)
        if val:
            body = node.body
        else:
            body = node.else_
        result = []
        for node in body:
            result.extend(self.visit_list(node))
        return result
项目：chalktalk_docs    作者：loremIpsum1771    | 项目源码 | 文件源码 
def visit_If(self, node):
        """Eliminate dead code."""
        # do not optimize ifs that have a block inside so that it doesn't
        # break super().
        if node.find(nodes.Block) is not None:
            return self.generic_visit(node)
        try:
            val = self.visit(node.test).as_const()
        except nodes.Impossible:
            return self.generic_visit(node)
        if val:
            body = node.body
        else:
            body = node.else_
        result = []
        for node in body:
            result.extend(self.visit_list(node))
        return result
项目：covar_me_app    作者：CovarMe    | 项目源码 | 文件源码 
def visit_If(self, node):
        """Eliminate dead code."""
        # do not optimize ifs that have a block inside so that it doesn't
        # break super().
        if node.find(nodes.Block) is not None:
            return self.generic_visit(node)
        try:
            val = self.visit(node.test).as_const()
        except nodes.Impossible:
            return self.generic_visit(node)
        if val:
            body = node.body
        else:
            body = node.else_
        result = []
        for node in body:
            result.extend(self.visit_list(node))
        return result
项目：Flask-NvRay-Blog    作者：rui7157    | 项目源码 | 文件源码 
def visit_If(self, node):
        """Eliminate dead code."""
        # do not optimize ifs that have a block inside so that it doesn't
        # break super().
        if node.find(nodes.Block) is not None:
            return self.generic_visit(node)
        try:
            val = self.visit(node.test).as_const()
        except nodes.Impossible:
            return self.generic_visit(node)
        if val:
            body = node.body
        else:
            body = node.else_
        result = []
        for node in body:
            result.extend(self.visit_list(node))
        return result
项目：Flask-NvRay-Blog    作者：rui7157    | 项目源码 | 文件源码 
def visit_If(self, node):
        """Eliminate dead code."""
        # do not optimize ifs that have a block inside so that it doesn't
        # break super().
        if node.find(nodes.Block) is not None:
            return self.generic_visit(node)
        try:
            val = self.visit(node.test).as_const()
        except nodes.Impossible:
            return self.generic_visit(node)
        if val:
            body = node.body
        else:
            body = node.else_
        result = []
        for node in body:
            result.extend(self.visit_list(node))
        return result
项目：Callandtext    作者：iaora    | 项目源码 | 文件源码 
def visit_If(self, node):
        """Eliminate dead code."""
        # do not optimize ifs that have a block inside so that it doesn't
        # break super().
        if node.find(nodes.Block) is not None:
            return self.generic_visit(node)
        try:
            val = self.visit(node.test).as_const()
        except nodes.Impossible:
            return self.generic_visit(node)
        if val:
            body = node.body
        else:
            body = node.else_
        result = []
        for node in body:
            result.extend(self.visit_list(node))
        return result
项目：My-Web-Server-Framework-With-Python2.7    作者：syjsu    | 项目源码 | 文件源码 
def visit_If(self, node):
        """Eliminate dead code."""
        # do not optimize ifs that have a block inside so that it doesn't
        # break super().
        if node.find(nodes.Block) is not None:
            return self.generic_visit(node)
        try:
            val = self.visit(node.test).as_const()
        except nodes.Impossible:
            return self.generic_visit(node)
        if val:
            body = node.body
        else:
            body = node.else_
        result = []
        for node in body:
            result.extend(self.visit_list(node))
        return result
项目：splunk_ta_ps4_f1_2016    作者：jonathanvarley    | 项目源码 | 文件源码 
def visit_If(self, node):
        """Eliminate dead code."""
        # do not optimize ifs that have a block inside so that it doesn't
        # break super().
        if node.find(nodes.Block) is not None:
            return self.generic_visit(node)
        try:
            val = self.visit(node.test).as_const()
        except nodes.Impossible:
            return self.generic_visit(node)
        if val:
            body = node.body
        else:
            body = node.else_
        result = []
        for node in body:
            result.extend(self.visit_list(node))
        return result
项目：python_ddd_flask    作者：igorvinnicius    | 项目源码 | 文件源码 
def visit_If(self, node):
        """Eliminate dead code."""
        # do not optimize ifs that have a block inside so that it doesn't
        # break super().
        if node.find(nodes.Block) is not None:
            return self.generic_visit(node)
        try:
            val = self.visit(node.test).as_const()
        except nodes.Impossible:
            return self.generic_visit(node)
        if val:
            body = node.body
        else:
            body = node.else_
        result = []
        for node in body:
            result.extend(self.visit_list(node))
        return result
项目：TA-SyncKVStore    作者：georgestarcher    | 项目源码 | 文件源码 
def visit_If(self, node):
        """Eliminate dead code."""
        # do not optimize ifs that have a block inside so that it doesn't
        # break super().
        if node.find(nodes.Block) is not None:
            return self.generic_visit(node)
        try:
            val = self.visit(node.test).as_const()
        except nodes.Impossible:
            return self.generic_visit(node)
        if val:
            body = node.body
        else:
            body = node.else_
        result = []
        for node in body:
            result.extend(self.visit_list(node))
        return result
项目：cb-defense-splunk-app    作者：carbonblack    | 项目源码 | 文件源码 
def visit_If(self, node):
        """Eliminate dead code."""
        # do not optimize ifs that have a block inside so that it doesn't
        # break super().
        if node.find(nodes.Block) is not None:
            return self.generic_visit(node)
        try:
            val = self.visit(node.test).as_const()
        except nodes.Impossible:
            return self.generic_visit(node)
        if val:
            body = node.body
        else:
            body = node.else_
        result = []
        for node in body:
            result.extend(self.visit_list(node))
        return result
项目：remoteControlPPT    作者：htwenning    | 项目源码 | 文件源码 
def visit_If(self, node):
        """Eliminate dead code."""
        # do not optimize ifs that have a block inside so that it doesn't
        # break super().
        if node.find(nodes.Block) is not None:
            return self.generic_visit(node)
        try:
            val = self.visit(node.test).as_const()
        except nodes.Impossible:
            return self.generic_visit(node)
        if val:
            body = node.body
        else:
            body = node.else_
        result = []
        for node in body:
            result.extend(self.visit_list(node))
        return result
项目：sublimeTextConfig    作者：luoye-fe    | 项目源码 | 文件源码 
def visit_If(self, node):
        """Eliminate dead code."""
        # do not optimize ifs that have a block inside so that it doesn't
        # break super().
        if node.find(nodes.Block) is not None:
            return self.generic_visit(node)
        try:
            val = self.visit(node.test).as_const()
        except nodes.Impossible:
            return self.generic_visit(node)
        if val:
            body = node.body
        else:
            body = node.else_
        result = []
        for node in body:
            result.extend(self.visit_list(node))
        return result
项目：ASE-Fall2016    作者：Dai0526    | 项目源码 | 文件源码 
def visit_If(self, node):
        """Eliminate dead code."""
        # do not optimize ifs that have a block inside so that it doesn't
        # break super().
        if node.find(nodes.Block) is not None:
            return self.generic_visit(node)
        try:
            val = self.visit(node.test).as_const()
        except nodes.Impossible:
            return self.generic_visit(node)
        if val:
            body = node.body
        else:
            body = node.else_
        result = []
        for node in body:
            result.extend(self.visit_list(node))
        return result
项目：APIGateway    作者：n89nanda    | 项目源码 | 文件源码 
def visit_If(self, node):
        """Eliminate dead code."""
        # do not optimize ifs that have a block inside so that it doesn't
        # break super().
        if node.find(nodes.Block) is not None:
            return self.generic_visit(node)
        try:
            val = self.visit(node.test).as_const()
        except nodes.Impossible:
            return self.generic_visit(node)
        if val:
            body = node.body
        else:
            body = node.else_
        result = []
        for node in body:
            result.extend(self.visit_list(node))
        return result
项目：QA4LOV    作者：gatemezing    | 项目源码 | 文件源码 
def visit_If(self, node):
        """Eliminate dead code."""
        # do not optimize ifs that have a block inside so that it doesn't
        # break super().
        if node.find(nodes.Block) is not None:
            return self.generic_visit(node)
        try:
            val = self.visit(node.test).as_const()
        except nodes.Impossible:
            return self.generic_visit(node)
        if val:
            body = node.body
        else:
            body = node.else_
        result = []
        for node in body:
            result.extend(self.visit_list(node))
        return result
项目：Sudoku-Solver    作者：ayush1997    | 项目源码 | 文件源码 
def visit_If(self, node):
        """Eliminate dead code."""
        # do not optimize ifs that have a block inside so that it doesn't
        # break super().
        if node.find(nodes.Block) is not None:
            return self.generic_visit(node)
        try:
            val = self.visit(node.test).as_const()
        except nodes.Impossible:
            return self.generic_visit(node)
        if val:
            body = node.body
        else:
            body = node.else_
        result = []
        for node in body:
            result.extend(self.visit_list(node))
        return result
项目：Flask-SocketIO    作者：cutedogspark    | 项目源码 | 文件源码 
def visit_If(self, node):
        """Eliminate dead code."""
        # do not optimize ifs that have a block inside so that it doesn't
        # break super().
        if node.find(nodes.Block) is not None:
            return self.generic_visit(node)
        try:
            val = self.visit(node.test).as_const()
        except nodes.Impossible:
            return self.generic_visit(node)
        if val:
            body = node.body
        else:
            body = node.else_
        result = []
        for node in body:
            result.extend(self.visit_list(node))
        return result
项目：metrics    作者：Jeremy-Friedman    | 项目源码 | 文件源码 
def visit_If(self, node):
        """Eliminate dead code."""
        # do not optimize ifs that have a block inside so that it doesn't
        # break super().
        if node.find(nodes.Block) is not None:
            return self.generic_visit(node)
        try:
            val = self.visit(node.test).as_const()
        except nodes.Impossible:
            return self.generic_visit(node)
        if val:
            body = node.body
        else:
            body = node.else_
        result = []
        for node in body:
            result.extend(self.visit_list(node))
        return result
项目：metrics    作者：Jeremy-Friedman    | 项目源码 | 文件源码 
def visit_If(self, node):
        """Eliminate dead code."""
        # do not optimize ifs that have a block inside so that it doesn't
        # break super().
        if node.find(nodes.Block) is not None:
            return self.generic_visit(node)
        try:
            val = self.visit(node.test).as_const()
        except nodes.Impossible:
            return self.generic_visit(node)
        if val:
            body = node.body
        else:
            body = node.else_
        result = []
        for node in body:
            result.extend(self.visit_list(node))
        return result
项目：youtube-trending-music    作者：ishan-nitj    | 项目源码 | 文件源码 
def visit_If(self, node):
        """Eliminate dead code."""
        # do not optimize ifs that have a block inside so that it doesn't
        # break super().
        if node.find(nodes.Block) is not None:
            return self.generic_visit(node)
        try:
            val = self.visit(node.test).as_const()
        except nodes.Impossible:
            return self.generic_visit(node)
        if val:
            body = node.body
        else:
            body = node.else_
        result = []
        for node in body:
            result.extend(self.visit_list(node))
        return result
项目：compatify    作者：hatooku    | 项目源码 | 文件源码 
def visit_If(self, node):
        """Eliminate dead code."""
        # do not optimize ifs that have a block inside so that it doesn't
        # break super().
        if node.find(nodes.Block) is not None:
            return self.generic_visit(node)
        try:
            val = self.visit(node.test).as_const()
        except nodes.Impossible:
            return self.generic_visit(node)
        if val:
            body = node.body
        else:
            body = node.else_
        result = []
        for node in body:
            result.extend(self.visit_list(node))
        return result
项目：compatify    作者：hatooku    | 项目源码 | 文件源码 
def visit_If(self, node):
        """Eliminate dead code."""
        # do not optimize ifs that have a block inside so that it doesn't
        # break super().
        if node.find(nodes.Block) is not None:
            return self.generic_visit(node)
        try:
            val = self.visit(node.test).as_const()
        except nodes.Impossible:
            return self.generic_visit(node)
        if val:
            body = node.body
        else:
            body = node.else_
        result = []
        for node in body:
            result.extend(self.visit_list(node))
        return result
项目：Flask_Blog    作者：sugarguo    | 项目源码 | 文件源码 
def fold(self, node):
        """Do constant folding."""
        node = self.generic_visit(node)
        try:
            return nodes.Const.from_untrusted(node.as_const(),
                                              lineno=node.lineno,
                                              environment=self.environment)
        except nodes.Impossible:
            return node
项目：Flask_Blog    作者：sugarguo    | 项目源码 | 文件源码 
def visit_TemplateData(self, node, frame):
        try:
            self.write(repr(node.as_const(frame.eval_ctx)))
        except nodes.Impossible:
            self.write('(context.eval_ctx.autoescape and Markup or identity)(%r)'
                       % node.data)
项目：Flask_Blog    作者：sugarguo    | 项目源码 | 文件源码 
def visit_EvalContextModifier(self, node, frame):
        for keyword in node.options:
            self.writeline('context.eval_ctx.%s = ' % keyword.key)
            self.visit(keyword.value, frame)
            try:
                val = keyword.value.as_const(frame.eval_ctx)
            except nodes.Impossible:
                frame.eval_ctx.volatile = True
            else:
                setattr(frame.eval_ctx, keyword.key, val)
项目：swjtu-pyscraper    作者：Desgard    | 项目源码 | 文件源码 
def fold(self, node):
        """Do constant folding."""
        node = self.generic_visit(node)
        try:
            return nodes.Const.from_untrusted(node.as_const(),
                                              lineno=node.lineno,
                                              environment=self.environment)
        except nodes.Impossible:
            return node
项目：swjtu-pyscraper    作者：Desgard    | 项目源码 | 文件源码 
def visit_TemplateData(self, node, frame):
        try:
            self.write(repr(node.as_const(frame.eval_ctx)))
        except nodes.Impossible:
            self.write('(context.eval_ctx.autoescape and Markup or identity)(%r)'
                       % node.data)
项目：swjtu-pyscraper    作者：Desgard    | 项目源码 | 文件源码 
def visit_EvalContextModifier(self, node, frame):
        for keyword in node.options:
            self.writeline('context.eval_ctx.%s = ' % keyword.key)
            self.visit(keyword.value, frame)
            try:
                val = keyword.value.as_const(frame.eval_ctx)
            except nodes.Impossible:
                frame.eval_ctx.volatile = True
            else:
                setattr(frame.eval_ctx, keyword.key, val)
项目：sublime-text-3-packages    作者：nickjj    | 项目源码 | 文件源码 
def fold(self, node):
        """Do constant folding."""
        node = self.generic_visit(node)
        try:
            return nodes.Const.from_untrusted(node.as_const(),
                                              lineno=node.lineno,
                                              environment=self.environment)
        except nodes.Impossible:
            return node
项目：sublime-text-3-packages    作者：nickjj    | 项目源码 | 文件源码 
def visit_TemplateData(self, node, frame):
        try:
            self.write(repr(node.as_const(frame.eval_ctx)))
        except nodes.Impossible:
            self.write('(context.eval_ctx.autoescape and Markup or identity)(%r)'
                       % node.data)
项目：sublime-text-3-packages    作者：nickjj    | 项目源码 | 文件源码 
def visit_EvalContextModifier(self, node, frame):
        for keyword in node.options:
            self.writeline('context.eval_ctx.%s = ' % keyword.key)
            self.visit(keyword.value, frame)
            try:
                val = keyword.value.as_const(frame.eval_ctx)
            except nodes.Impossible:
                frame.eval_ctx.volatile = True
            else:
                setattr(frame.eval_ctx, keyword.key, val)
项目：zanph    作者：zanph    | 项目源码 | 文件源码 
def fold(self, node):
        """Do constant folding."""
        node = self.generic_visit(node)
        try:
            return nodes.Const.from_untrusted(node.as_const(),
                                              lineno=node.lineno,
                                              environment=self.environment)
        except nodes.Impossible:
            return node
项目：zanph    作者：zanph    | 项目源码 | 文件源码 
def visit_TemplateData(self, node, frame):
        try:
            self.write(repr(node.as_const(frame.eval_ctx)))
        except nodes.Impossible:
            self.write('(context.eval_ctx.autoescape and Markup or identity)(%r)'
                       % node.data)
项目：zanph    作者：zanph    | 项目源码 | 文件源码 
def visit_EvalContextModifier(self, node, frame):
        for keyword in node.options:
            self.writeline('context.eval_ctx.%s = ' % keyword.key)
            self.visit(keyword.value, frame)
            try:
                val = keyword.value.as_const(frame.eval_ctx)
            except nodes.Impossible:
                frame.eval_ctx.volatile = True
            else:
                setattr(frame.eval_ctx, keyword.key, val)