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Using variables inside a bash heredoc
...because you've put the delimiter in quotes - the bash manual says:
The format of here-documents is:
<<[-]word
here-document
delimiter
No parameter expansion, command substitution, arithmetic expansion, or
pathname expansion is performed on word. If any ...
How do I add custom field to Python log format string?
My current format string is:
7 Answers
7
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How do I filter ForeignKey choices in a Django ModelForm?
...
ForeignKey is represented by django.forms.ModelChoiceField, which is a ChoiceField whose choices are a model QuerySet. See the reference for ModelChoiceField.
So, provide a QuerySet to the field's queryset attribute. Depen...
Assigning a variable NaN in python without numpy
...= nan
False
>>> import math
>>> math.isnan(nan)
True
Before Python 3.5, one could use float("nan") (case insensitive).
Note that checking to see if two things that are NaN are equal to one another will always return false. This is in part because two things that are "not a numbe...
Removing event listener which was added with bind
... x);
Toolbox.removeListener(window, 'scroll', x);
This works as expected for me.
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Using @property versus getters and setters
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Prefer properties. It's what they're there for.
The reason is that all attributes are public in Python. Starting names with an underscore or two is just a warning that the given attribute is an implementation detail that may not stay the same in future versions of th...
Javascript Drag and drop for touch devices [closed]
I am looking for a drag & DROP plugin that works on touch devices.
5 Answers
5
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C++代码执行安装包静默安装 - C/C++ - 清泛网 - 专注C/C++及内核技术
...。1.-----------------------CreateProcess---------------------- PROCESS_INFORMATIO...需求：安装包下载完成后，创建一个子进程自动安装。
1.-----------------------CreateProcess----------------------
PROCESS_INFORMATION pi;
STARTUPINFO si;
memset( &si, 0, ...
Most efficient way to remove special characters from string
...haracters(this string str) {
StringBuilder sb = new StringBuilder();
foreach (char c in str) {
if ((c >= '0' && c <= '9') || (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || c == '.' || c == '_') {
sb.Append(c);
}
}
return...
Multiple variables in a 'with' statement?
... class test2: x=1; t2=test2() with open('f2.txt') as t2.x: for l1 in t2.x.readlines(): print(l1); # Charlie Parker # tested in python 3.6
– Ahmad Yoosofan
Aug 12 '17 at 8:33
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