Flask-session和WTForms

Flask-session和WTForms
Flask-session
安装 pip install flask-session
1. # -*- coding: utf-8 -*-
2. from flask import Flask, session
3. from flask_session import Session
4. from redis import Redis
6. # flask 的session
7. # app = Flask(__name__)
8. # app.secret_key = 'rfrevtrtr55g'
9. #
10. # @app.route('/')
11. # def index():
12. # session['user'] = 'peach'
13. # return 'index'
14. #
15. # app.run(host='0.0.0.0', debug=True)
17. # 第三方组件flask-session
18. app = Flask(__name__)
19. app.config['SESSION_TYPE'] = 'redis' # 保存session到redis
20. app.config['SESSION_REDIS'] = Redis(host='192.168.32.71',
21. password='redhat',
22. db=1) # session redis配置
23. Session(app) # 替换flask 中的session, 重写了flask 中session get_interface方法
25. # config.setdefault('SESSION_TYPE', 'null') # config是字典, 设置默认值，有的话就不管
27. @app.route('/')
28. def index():
29. session['user'] = 'peach' # 这里发现浏览器里面的session变成了uuid, redis存放了session信息
30. # uuid 是从redis中取数据的
31. return 'index'
33. app.run(host='0.0.0.0', debug=True)
保存的结果 session:uuid
1. 127.0.0.1:6379[1]> KEYS *
2. 1) "session:554532f2-f92f-4bbf-94c8-639ceb043dce"
3. 2) "session:d6f03654-f0a0-4046-933c-503f515499a6"
扩展
Flask-session 如何巧妙替换flask再带的session

WTForms
安装 pip install WTForms
视图
1. # -*- coding: utf-8 -*-
2. from flask import Flask, render_template,request
3. from wtforms.fields import simple, core
4. from wtforms import validators
5. from wtforms import Form
7. app = Flask(__name__, template_folder='../templates')
10. class LoginForm(Form):
11. username = simple.StringField(
12. label="用户名", # 标签标记
13. validators=[validators.DataRequired(message="用户名不能为空"),
14. validators.Length(min=3,max=8,message="不是长了就是短了")], # 校验条件可迭代条件
15. # description='11111111111', # 描述标记
16. id="user_id", # 标签ID
17. default=None, # 默认值
18. widget=None, # 默认组件(input type="text") 在StringField中已经被实例化了
19. render_kw={"class":"my_login"}, # {"class":"my_login"}
20. )
21. password = simple.PasswordField(
22. label="密码", # 标签标记
23. validators=[validators.DataRequired(message="密码不能为空"),
24. validators.Length(min=3, max=16, message="不是长了就是短了"),
25. validators.Email(message="密码必须符合邮箱规则")], # 不知道
26. # description='11111111111', # 描述标记
27. id="user_id", # 标签ID
28. default=None, # 默认值
29. widget=None, # 默认组件(input type="text") 在StringField中已经被实例化了
30. render_kw={"class": "my_login"}, # {"class":"my_login"}
31. )
33. @app.route("/",methods=["GET","POST"])
34. def index():
35. if request.method == "GET":
36. fm = LoginForm()
37. return render_template("wtf.html",wtf = fm)
38. else:
39. new_fm = LoginForm(request.form)
40. if new_fm.validate():
41. return new_fm.data.get("username")
42. else:
43. return render_template("wtf.html", wtf=new_fm)
45. if __name__ == '__main__':
46. app.run(host='0.0.0.0' ,debug=True)
前端
1. <!DOCTYPE html>
2. <html lang="zh-CN">
3. <head>
4. <meta charset="UTF-8">
5. <title>Title</title>
6. <meta name="viewport" content="width=device-width, initial-scale=1">
7. </head>
8. <body>
9. <form action="" method="post" novalidate>
10. {{ wtf.username.label }}
11. {{ wtf.username }}
12. <p><h1>{{wtf.username.errors.0}}</h1></p>
13. <p>
14. {{ wtf.password.label }}
15. {{ wtf.password }}
16. </p>
17. <p><h1>{{wtf.password.errors.0}}</h1></p>
18. <input type="submit" value="登录">
19. </form>
20. </body>
21. </html>
注册表单演示
1. # -*- coding: utf-8 -*-
2. from flask import Flask, render_template,request
3. from wtforms.fields import simple, core
4. from wtforms import validators
5. from wtforms import Form
7. app = Flask(__name__, template_folder='../templates')
9. class RegForm(Form):
10. username = simple.StringField(
11. label="用户名", # 标签标记
12. validators=[validators.DataRequired(message="用户名不能为空"),
13. validators.Length(min=3, max=8, message="不是长了就是短了")],) # 校验条件可迭代条件
16. password = simple.PasswordField(
17. label="密码", # 标签标记
18. validators=[validators.DataRequired(message="密码不能为空"),
19. validators.Length(min=3, max=16, message="不是长了就是短了"),
20. validators.Email(message="密码必须符合邮箱规则")],) # 校验字段
22. regpassword = simple.PasswordField(
23. label="确定密码", # 标签标记
24. validators=[validators.EqualTo(fieldname="password", message='密码两次不相同')], ) # 确认密码
26. gender = core.RadioField(
27. label="性别",
28. coerce=str, # 数据类型
29. choices=(
30. ("1", "女"),
31. ("2", "男")
32. ),
33. default="1" # 下面对应上面数据类型int就写1 str 就写"1"
34. )
36. hobby = core.SelectMultipleField(
37. label="爱好",
38. validators=[validators.Length(min=2, max=4, message="癖好有问题")],
39. coerce=int,
40. choices=(
41. (1, "fengjie"),
42. (2, "luoyufeng"),
43. (3, "lixueqin"),
44. (4, "wuyifan"),
45. (5, "panta")
46. ),
47. default=(1, 3, 5)
48. )
50. @app.route('/res', methods=['POST', 'GET'])
51. def res():
52. if request.method == "GET":
53. rf = RegForm()
54. return render_template("res.html",rfrf = rf)
55. else:
56. new_rf = RegForm(request.form)
57. if new_rf.validate():
58. return new_rf.data.get("username")
59. else:
60. return render_template("res.html", rf=new_rf)
63. if __name__ == '__main__':
64. app.run(host='0.0.0.0' ,debug=True)
前端
1. <!DOCTYPE html>
2. <html lang="en">
3. <head>
4. <meta charset="UTF-8">
5. <title>res</title>
6. </head>
7. <body>
9. <form action="" method="post" novalidate>
10. {% for foo in rf %} {# 遍历出来的是单个对象 #}
11. <p>{{ foo.label }}{{ foo }}{{ foo.errors.0 }}</p>
12. {% endfor %}
13. <input type="submit" value="注册">
14. </form>
15. </body>
16. </html>
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原文地址：https://www.cnblogs.com/py-web/p/12017337.html