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How do you check in python whether a string contains only numbers?
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Using sed and grep/egrep to search and replace
I am using egrep -R followed by a regular expression containing about 10 unions, so like:
.jpg | .png | .gif etc. This works well, now I would like to replace all strings found with .bmp
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Long-lasting FB access-token for server to pull FB page info
...hese will cause the access token to become invalid.
If you are getting (#100) Tried accessing nonexisting field (accounts) on node type (Page), go to the Access Token Debugger, copy the value of User ID, and use it to replace the "me" part of the URL in step 9.
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IRXmitter红外发射器扩展 · App Inventor 2 中文网
...或获取要使用的载波频率，单位为赫兹(Hz)。默认值为38,000（38 kHz）。只能设置CarrierFrequencies或CarrierFrequencyList显示的值。如果指定了不支持的值，会触发Screen.ErrorOccurred事件，错误代码17302。
启动延迟
在自动重复模式下，Start...
What does “javascript:void(0)” mean?
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1081
The void operator evaluates the given
expression and then returns undefined.
The voi...
CSS: Setting width/height as Percentage minus pixels
...re writing for CSS3-compliant browsers, you can use calc:
height: calc(100% - 18px);
It's worth it to note that not all browsers currently support the standard CSS3 calc() function, so implementing the browser specific versions of the function may be required like the following:
/* Firefox */
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How to have a default option in Angular.js select box
... simply use ng-init like this
<select ng-init="somethingHere = options[0]"
ng-model="somethingHere"
ng-options="option.name for option in options">
</select>
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How to make Java honor the DNS Caching Timeout?
...ou will want to set the following System property:
-Dsun.net.inetaddr.ttl=0
This system property will enable the desired effect.
But be aware: if you don't use the -D flag when starting the JVM process and elect to call this from code instead:
java.security.Security.setProperty("networkaddres...
How to kill all processes matching a name?
...hich means, for example, if we see these lines in ps aux:
apache 24268 0.0 2.6 388152 27116 ? S Jun13 0:10 /usr/sbin/httpd
apache 24272 0.0 2.6 387944 27104 ? S Jun13 0:09 /usr/sbin/httpd
apache 24319 0.0 2.6 387884 27316 ? S Jun15 0:04 /usr/sbin/http...
Does JavaScript guarantee object property order?
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507
The iteration order for objects follows a certain set of rules since ES2015, but it does not (a...