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How does '20 seconds' work in Scala?
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There are a few things going on.
First, Scala allows dots and parens to be omitted from many method calls, so 20 seconds is equivalent to 20.seconds()*.
Second, an "implicit conversion" is applied. Since 20 is an Int and Int has no seconds method, the compiler searches for an impli...
Python - abs vs fabs
...n (if it can't, it throws an exception). It then takes the absolute value, and returns the result as a float.
In addition to floats, abs() also works with integers and complex numbers. Its return type depends on the type of its argument.
In [7]: type(abs(-2))
Out[7]: int
In [8]: type(abs(-2.0))
Out...
What is the best way to count “find” results?
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find <expr> -type f -printf '.' | wc -c
It will be more reliable and faster than counting the lines.
Note that I use the find's printf, not an external command.
Let's bench a bit :
$ ls -1
a
e
l
ll.sh
r
t
y
z
My snippet benchmark :
$ time find -type f -printf '.' | wc -c
8
real ...
How do I return multiple values from a function? [closed]
...ing library got the NamedTuple class to make named tuples easier to create and more powerful. Inheriting from typing.NamedTuple lets you use docstrings, default values, and type annotations.
Example (From the docs):
class Employee(NamedTuple): # inherit from typing.NamedTuple
name: str
id...
How to update a git clone --mirror?
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This is the command that you need to execute on the mirror:
git remote update
share
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Defining Z order of views of RelativeLayout in Android
I would like to define the z order of the views of a RelativeLayout in Android.
13 Answers
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Save bitmap to location
...function to download an image from a web server, display it on the screen, and if the user wishes to keep the image, save it on the SD card in a certain folder. Is there an easy way to take a bitmap and just save it to the SD card in a folder of my choice?
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How can i use iptables on centos 7? [closed]
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It is possible to go back to a more classic iptables setup. First, stop and mask the firewalld service:
systemctl stop firewalld
systemctl mask firewalld
Then, install the iptables-services package:
yum install iptables-services
Enable the service at boot-time:
systemctl enable iptables
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小米360同日竞技：智能手机血战再起 - 资讯 - 清泛网 - 专注C/C++及内核技术
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小米推定位产品
美国科技媒体人沃尔特·莫斯伯格(Walt Mossberg)最近在评测文章中说：“小米Note满足了他对苹果手机的所有想象。”
小米科技推出小米Note顶配版，目的是重新定义高端市场旗舰机标准。莫斯伯格评价说：“即使...
What is a servicebus and when do I need one?
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You can think of a service bus as the Ethernet of SOA.
First and foremost, it introduces a language of identifying things, like an IP address in Ethernet. This name isn't something inherently physical.
Next, you have something physical involved on each node, like a queue in the case o...