我想制作一个 Flask 应用程序来接收用户的详细信息。注册成功后，将显示一个新页面，显示输入的详细信息。
该应用程序是使用 HTML forms 构建的而不是使用 WTForms .
这是 app.py 的代码:
from flask import Flask, render_template, request
app = Flask(__name__)
@app.route('/register',methods = ['POST', 'GET'])
def user():
if request.method == 'POST':
result = request.form
name = result['name']
phoneno = result['phoneno']
email = result['email']
password = result['password']
if name or phoneno or email or password is not None:
print name,phoneno,email,password
return render_template("register.html",result=result)
if __name__ == '__main__':
app.run(debug = True)
这是register.html的HTML页面:
<html>
<body>
<form action = "/success" method = "POST">
<p>Name <input type = "text" name = "name" /></p>
<p>Phone no <input type = "text" name = "phoneno" /></p>
<p>Email <input type = "text" name = "email" /></p>
<p>Password <input type ="text" name = "password" /></p>
<p><input type = "submit" value = "submit" /></p>
</form>
</body>
</html>
我现在得到的是这个错误:
Full Traceback
**UnboundLocalError**
UnboundLocalError: local variable 'result' referenced before assignment.
File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 2000, in __call__
return self.wsgi_app(environ, start_response)
File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1991, in wsgi_app
response = self.make_response(self.handle_exception(e))
File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1567, in handle_exception
reraise(exc_type, exc_value, tb)
File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1988, in wsgi_app
response = self.full_dispatch_request()
File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1641, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1544, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1639, in full_dispatch_request
rv = self.dispatch_request()
File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1625, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "/home/protocol/PycharmProjects/tut/app.py", line 17, in user
return render_template("register.html",result=result)
UnboundLocalError: local variable 'result' referenced before assignment
我尝试打印这些值，但控制台中没有显示任何内容，因此我无法纠正此错误。
最佳答案
result 仅当 request 方法为 POST 时才存在，因此如果请求方法为 GET(其中是默认请求之一)，即在提交用户数据表单之前请求该页面，则 result 将不存在，因此会出现错误消息。另外，您需要将 result 对象渲染到另一个模板中，例如 user.html:
@app.route('/register',methods = ['POST', 'GET'])
def user():
if request.method == 'POST':
result = request.form
name = result['name']
phoneno = result['phoneno']
email = result['email']
password = result['password']
if name or phoneno or email or password is not None:
print name,phoneno,email,password
return render_template("user.html",result=result)
return render_template("register.html")
另外，如果上面的 View 函数是针对register.html表单的，那么你还需要在form block 中进行更改，来自:
<form action = "/success" method = "POST">
至
<form action = "/register" method = "POST">
关于python - 渲染 Flask HTML 表单结果为 "UnboundLocalError"，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/38675377/