服务端：
from flask import Flask,request
app = Flask(__name__)
@app.route("/index/",methods = ['get','post'])
def index():
print(request.form)
print(request.files)
# file1 = request.files.get("myfile")
# file1.save('fil')
return 'OK'
app.run()
浏览器：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>用户注册</title>
</head>
<body>
<form action="http://127.0.0.1:5000/index/" method="post" enctype="multipart/form-data">
<p><label>username:<input type="text" name="username" placeholder="请输入用户名"></label></p>
<p><label>password:<input type="password" name="password" placeholder="请输入密码"></></p>
<p>
<label>re_pwd:<input type="password" name="re_pwd" placeholder="请确认密码"></label>
</p>
<p>
<label for="">
<input type="radio" name="gender">male
<input type="radio" name="gender">female
<input type="radio" name="gender">other
</label>
</p>
<p>
<input type="submit" value="注册">
</p>
</form>
</body>
</html>