我需要检测函数是否为空定义.它可以像:
def foo():
pass
或者喜欢:
def foo(i, *arg, **kwargs):
pass
或者喜欢:
foo = lambda x: None
使用'inspect'模块检测它们的最优雅方法是什么？有没有比这更好的方法:
def isEmptyFunction(func):
e = lambda: None
return func.__code__.co_code == e.__code__.co_code
当我在http://www.google.com上运行以下示例代码时,它运行正常但是当我尝试https://www.google.com时,我收到此错误:
Requesting https://www.google.com
Unhandled error in Deferred:
Unhandled Error
Traceback (most recent call last):
Failure: twisted.web._newclient.ResponseNeverReceived: [<twisted.python.failure.Failure <class 'OpenSSL.SSL.Error'>>]
我使用的是python 2.7.8,twisted 14.0.2,service_identity 14.0.0,treq 0.2.1,OpenSSL 0.14
import treq
from twisted.internet import reactor, defer
import sys
@defer.inlineCallbacks
def doit(url):
print "Requesting "+ url + "\n"
results = yield treq.get(url)
print "...got results\n"
content = yield results.content()
print "%s"%content
reactor.stop()
def main():
url = sys.argv[1]
reactor.callLater(0, doit, url)
reactor.run()
if __name__ == '__main__':
main()
提前致谢!
我的简单测试代码如下所示.我已经创建了表,可以使用Firefox上的SQLite Manager加载项查询它,所以我知道表和数据存在.当我在python中运行查询(并使用python shell)时,我得到了没有这样的表错误
def TroyTest(self, acctno):
conn = sqlite3.connect('TroyData.db')
curs = conn.cursor()
v1 = curs.execute('''
SELECT acctvalue
FROM balancedata
WHERE acctno = ? ''', acctno)
print v1
conn.close()
在我的代码中,我有以下内容:
public void PopulateForm(int i)
{
DAL.TicketsDataSetTableAdapters.TicketDetailsTableAdapter fobj = new DAL.TicketsDataSetTableAdapters.TicketDetailsTableAdapter();
DataTable dt = new DataTable();
dt = fobj.GetTicketUpdates(txtSupportRef.Text);
txtShortDesc.Text = dt.Rows[0].Table.Rows[i]["ShortDesc"].ToString();
txtNextStep.Text = dt.Rows[0].Table.Rows[i]["NextStep"].ToString();
txtLastUpdated.Text = dt.Rows[0].Table.Rows[i]["LastUpdated"].ToString();
}
然后在我背后的代码的另一个区域:
protected void btnNext_Click1(object sender, EventArgs e)
{
int i = (int)ViewState["recordIndex"];
i = i >= dt.Rows[0].Table.Rows.Count - 1 ? 0 : i + 1;
PopulateForm(i);
}
但是当我构建解决方案时,它说:
The name 'dt' does not exist in the current context