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Argparse optional positional arguments?
I have a script which is meant to be used like this:
usage: installer.py dir [-h] [-v]
3 Answers
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How to prevent ifelse() from turning Date objects into numeric objects
...irst this felt a little "hackish" to me. But now I just think of it as a small price to pay for the performance returns that I get from ifelse(). Plus it's still a lot more concise than a loop.
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Reactjs convert html string to jsx
...hanks though :)
– Peter Wateber
Oct 10 '13 at 2:37
1
It's worth playing it safe to sanitize the c...
pip issue installing almost any library
I have a difficult time using pip to install almost anything. I'm new to coding, so I thought maybe this is something I've been doing wrong and have opted out to easy_install to get most of what I needed done, which has generally worked. However, now I'm trying to download the nltk library, and neit...
How do I pass the this context to a function?
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Javascripts .call() and .apply() methods allow you to set the context for a function.
var myfunc = function(){
alert(this.name);
};
var obj_a = {
name: "FOO"
};
var obj_b = {
name: "BAR!!"
};
Now you can call:
myfunc.ca...
日历日程使用指导 · App Inventor 2 中文网
...{
日历日程1.AddEvent("组会", 计时器1.MakeInstantFromParts(2026, 10, 8, 9, 0, 0), 计时器1.MakeInstantFromParts(2026, 10, 8, 10, 0, 0), "305 室", "带电脑", 15)
}
when 日历日程1.EventAdded(日程编号) {
微数据库1.StoreValue("meeting_id", 日程编号)
对话框1.ShowAle...
What's wrong with overridable method calls in constructors?
...ohibit it:
There are a few more restrictions that a class must obey to allow inheritance. Constructors must not invoke overridable methods, directly or indirectly. If you violate this rule, program failure will result. The superclass constructor runs before the subclass constructor, so the overr...
How do you print in a Go test using the “testing” package?
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Command go
Description of testing flags
-v
Verbose output: log all tests as they are run. Also print all
text from Log and Logf calls even if the test succeeds.
Package testing
func (*T) Log
func (c *T) Log(args ...interface{})
Log formats its arguments using default ...
App Inventor 2 AlphaDialog 对话框扩展 · App Inventor 2 中文网
...; margin-bottom: 4px; background: url(/static/images/feedback.svg) 50% / 100% auto no-repeat; } /*手机版：反馈浮动按钮收小*/ @media screen and (max-width: 700px) { .feedback-pop { font-size: 13px; line-height: 14px; padding: 10px 7px; } .feedback-pop .feedback-img { width: 2...
How do I format a date with Dart?
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You can use the intl package (installer) to format dates.
For en_US formats, it's quite simple:
import 'package:intl/intl.dart';
main() {
final DateTime now = DateTime.now();
final DateFormat formatter = DateFormat('yyyy-MM-dd');
final String formatted...