python学习笔记 - dict.update
在学习tornado template源码的时候，遇到以下dict.update语法：
def generate(self, **kwargs): """Generate this template with the given arguments.""" namespace = { "escape": escape.xhtml_escape, "url_escape": escape.url_escape, "json_encode": escape.json_encode, "squeeze": escape.squeeze, "datetime": datetime, } namespace.update(kwargs)dic = {"A":"a", "B":"b"}# print the original dict object, output {"A":"a", "B":"b"}print dic# update the given key to invoke the another value if the given key existsdic.update(A="Aa")# output {'A': 'Aa', 'B': 'b'}print dic# if the the given key is not existed, add this key/value pair in the target dict objectdic.update(C="C")# output {'A': 'Aa', 'C': 'C', 'B': 'b'}print dic