render_template() takes exactly 1 argument

python新手，刚开始用Pycharm。
今天遇到一个很蠢的问题。。以为是python版本不兼容发现是我想多了。。浪费了时间，希望给其他遇到这种智障问题的朋友提供一个提醒。。

错误是这样的：

TypeErrorTypeError: render_template() takes exactly 1 argument (2 given)Traceback (most recent call last)File "/Library/Python/2.7/site-packages/flask/app.py", line 1994, in __call__return self.wsgi_app(environ, start_response)File "/Library/Python/2.7/site-packages/flask/app.py", line 1985, in wsgi_appresponse = self.handle_exception(e)File "/Library/Python/2.7/site-packages/flask/app.py", line 1540, in handle_exceptionreraise(exc_type, exc_value, tb)File "/Library/Python/2.7/site-packages/flask/app.py", line 1982, in wsgi_appresponse = self.full_dispatch_request()File "/Library/Python/2.7/site-packages/flask/app.py", line 1614, in full_dispatch_requestrv = self.handle_user_exception(e)File "/Library/Python/2.7/site-packages/flask/app.py", line 1517, in handle_user_exceptionreraise(exc_type, exc_value, tb)File "/Library/Python/2.7/site-packages/flask/app.py", line 1612, in full_dispatch_requestrv = self.dispatch_request()File "/Library/Python/2.7/site-packages/flask/app.py", line 1598, in dispatch_requestreturn self.view_functions[rule.endpoint](**req.view_args)File "/Users/sherry/PycharmProjects/c2/c2.py", line 16, in profilereturn render_template("profile.html", uid )TypeError: render_template() takes exactly 1 argument (2 given)

一直以为是包的问题，结果并不是！
划重点。。。

TypeError: render_template() takes exactly 1 argument (2 given)

问题&解决方案：
render_template真的只接受一个位置参数(模板名称),但是其余的参数(在* *上下文)作为关键字参数提供。否则模板中没有办法参考你传入的变量(你必须给他们明确的名称)，例如：

return render_template('index.html', f1=f1, f2=f2)

我错在f1, f2没赋值。写代码debug经验不足，浪费了一些时间，写个博客惩罚一下自己的粗心，也希望对遇到这个问题的新手有帮助。