我试着
from pygal.i18 import COUNTRIES
但我得到的只是
ImportError: No module named 'pygal.i18n'.
谁能告诉我这是什么问题？
谢谢
resp = web.Response(body=json.dumps(r, cls=CJsonEncoder, ensure_ascii=False, default=lambda o: o.__dict__).encode('utf-8'))
当我使用 jinja2 并从 MYSQL 中检索日期时，但显示错误。数据：
2015-09-01 2015-09-04
如何解决？我需要将 jinja2 转换为 django 吗？？
如何将十进制数舍入到python中可被2,4,8和16整除的最接近的数字？
例:
1920/1.33 = 1443.609022556391
它应该四舍五入到1440,因为它很容易被2,4,8和16整除,反之亦然(1440*1.33 = 1920).
1920/1.33 = 1440
我正在尝试编写一段代码来处理负平方根的例外,因为我只想要一个正结果.我的代码是:
def sqRoot(x):
try:
result = (x)**0.5
except ValueError:
result = "This is a negative root"
except TypeError:
result = "Please enter a number"
return result
出于某种原因,当我使用调用运行此代码时
x = sqRoot(-200)
我没有得到错误,而是python给了我一个复数的结果.我似乎无法在代码中看到错误.
语法错误：外部函数“ yield”
>>> for x in range(10):
... yield x*x
...
File "<stdin>", line 2
SyntaxError: 'yield' outside function
我该怎么办？当我尝试在for循环中使用简单yield时。
我在烧瓶登录方面遇到问题。我在网站上搜索过，但没有找到解决方案...
当我想要连接时，我收到以下消息：
属性错误
AttributeError：“用户”对象没有属性“is_active”
File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1836, in __call__
return self.wsgi_app(environ, start_response)
File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1820, in wsgi_app
response = self.make_response(self.handle_exception(e))
File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1403, in handle_exception
reraise(exc_type, exc_value, tb)
File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1817, in wsgi_app
response = self.full_dispatch_request()
File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1477, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1381, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1475, in full_dispatch_request
rv = self.dispatch_request()
File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1461, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "/home/ya2s/UNIVERSITE/WEB/web-serveur/projetvin/tuto/views.py", line 112, in …它背后有什么逻辑吗？
>>>'a' and 'b' and 'c'
'c'
>>>'a' or 'b' or 'c'
'a'
I have a list or array (what is the correct term in python?) of objects. What is the most efficient way to get all objects matching a condition?
I could iterate over the list and check each element, but that doesn't seem very efficient.
objects = []
for object in list:
if object.value == "123":
objects.add(object)