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Python syntax for “if a or b or c but not all of them”
...'x', 'y', 'z'])
args = parser.parse_args()
if len(args.abc) != 3:
parser.error('expected 3 arguments')
print(args.abc)
Here are some usage examples:
# default case
wim@wim-zenbook:/tmp$ ./three_or_none.py
['x', 'y', 'z']
# explicit case
wim@wim-zenbook:/tmp$ ./three_or_none.py 1 2 3
['1', '2'...
Firefox ignores option selected=“selected”
...ause "Attribute autocomplete not allowed on element select at this point." errors on validation.
– Scott
Oct 22 '15 at 18:41
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iTextSharp - Sending in-memory pdf in an email attachment
...he result did not change - I still get the "Cannot Access a Closed Stream" error. :( Other ideas?
– Gus Cavalcanti
Jul 28 '09 at 19:25
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SSMS插件开发指南 - C/C++ - 清泛网 - 专注C/C++及内核技术
...COM互操作注册”）
Windows Registry Editor Version 5.00
[HKEY_CURRENT_USER\Software\Microsoft\Microsoft SQL Server\100\Tools\Shell\Addins\SSMSAddin.Connect]
"FriendlyName"="SSMSAddin "
"LoadBehavior"=dword:00000001
"Description"="SSMSAddin desc "
SSMS加载插件的原理和VS插...
How to store decimal values in SQL Server?
... decimal point.
So, if you enter 100.0 in MySQL database, it will show an error like "Out of Range Value for column".
So, you can enter in this range only: from 00.00 to 99.99.
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How to convert vector to array
...?
If you're calling an API function that expects the former, you can do do_something(&v[0], v.size()), where v is a vector of doubles. The elements of a vector are contiguous.
Otherwise, you just have to copy each element:
double arr[100];
std::copy(v.begin(), v.end(), arr);
Ensure not only...
SQL/mysql - Select distinct/UNIQUE but return all columns?
...
The query won't parse for me and gives an error: The ranking function "row_number" must have an ORDER BY clause. We need to add order by clause after partition by field1. So the correct query will be select * from ( select *, row_number() over (partiti...
How to escape special characters in building a JSON string?
...parse("'foo'") in your browser console, for example, and observe the SyntaxError: Unexpected token '. The JSON spec is really simple and clear about this. There is no escape sequence in JSON for single quotes, and a JSON string cannot be single-quoted.
– Mark Amery
...
Using Django time/date widgets in custom form
... the proper field names from your model):
from django import forms
from my_app.models import Product
from django.contrib.admin import widgets
class ProductForm(forms.ModelForm):
class Meta:
model = Product
def __init__(self, *args, **kwargs):
...
WCF ServiceHost access rights
I get the following error when going through the WCF tutorial.
10 Answers
10
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