小编dor*_*oru的帖子

我试图将从日期选择器中选择的日期返回到我的 python 代码中的 sql 查询中。我也尝试使用encode(utf-8)删除 unicode 字符串，但仍然收到错误。

我是Python新手。谁能帮我弄清楚如何解决这个问题吗？我正在使用 python Flask 来创建网页

if request.method=='POST':
        dateval2 = request.form['datepick']
        dateval = dateval2.encode('utf-8')
    result = ("SELECT * FROM OE_TAT where convert(date,Time_IST)='?'",dateval
    df = pd.read_sql_query(result,connection)`

错误：

pandas.io.sql.DatabaseError
DatabaseError: Execution failed on sql '("SELECT * FROM OE_TAT where convert(date,Time_IST)='?'", '2015-06-01')': The first argument to execute must be a string or unicode query.

收集要安装的项目会话上下文时发生错误:

(profile=epp.package.jee, phase=org.eclipse.equinox.internal.p2.engine.phases.Collect, operand=, action=).
Unable to read repository at http://dl.google.com/eclipse/plugin/3.7/plugins/com.google.appengine.eclipse.core_2.3.3.r37v201107211953.jar.
Read timed out
Unable to read repository at http://dl.google.com/eclipse/plugin/3.7/plugins/com.google.gdt.eclipse.core_2.3.3.r37v201107211953.jar.
Read timed out
Unable to read repository at http://dl.google.com/eclipse/plugin/3.7/plugins/com.google.gdt.eclipse.maven_2.3.3.r37v201107211953.jar.
Read timed out
Unable to read repository at http://dl.google.com/eclipse/plugin/3.7/plugins/com.google.gwt.eclipse.core_2.3.3.r37v201107211953.jar.
Read timed out

我是Flask和WTForms的新手,我无法渲染我的HTML页面.我一次又一次地浏览了WTforms文档,但是我找不到错误的来源:

jinja2.exceptions.UndefinedError, UndefinedError: 'form' is undefined

我的代码如下:

forms.py

from flask.ext.wtf import Form
from wtforms import TextField, BooleanField, TextAreaField, StringField, PasswordField, SelectField, validators

class LoginForm(Form):
    username = TextField('Username', [
        validators.Required(), 
        validators.Length(min=4, max=25)
    ])
    password = PasswordField('New Password', [
        validators.Required()
    ])

app.py

from forms import *
from wtforms import Form, fields, BooleanField, TextField, StringField,     PasswordField, validators
from werkzeug.security import generate_password_hash, \
 check_password_hash

@app.route('/login/', methods=['GET', 'POST'])
def login():
    form = LoginForm(request.form)
    if request.method == 'POST' and form.validate():
        if load_user(form.username.data) is None:
            flash('Invalid username') …

我想在每个产品下显示计算的折扣。下面的代码没有错误，但不显示值。

模型.py：

from django.db import models
# Create your models here.
CATEGORIES = (  
    ('Electronics', 'Electronics'),
    ('Clothing', 'Clothing'),
)

class Products(models.Model):
    Image = models.FileField()
    ProductName = models.CharField(max_length = 250, default='')
    Brand = models.CharField(max_length = 250, default='')
    OriginalPrice = models.IntegerField(default = '')
    Price = models.IntegerField(default = '')
    Category = models.CharField(max_length = 250, choices = CATEGORIES)

    class Meta:
        verbose_name = 'Product'
        verbose_name_plural = 'Products'

    def DiscountCalc(self):
        Discount = (Price/OriginalPrice) * 100
        return self.Discount

    def __str__ (self):
        return self.ProductName

这是模板 index.html： …