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Set up adb on Mac OS X
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Note: this was originally written on Installing ADB on macOS but that question was closed as a duplicate of this one.
Option 1 - Using Homebrew
This is the easiest way and will provide automatic updates.
Install homebrew
/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com...
Should you commit .gitignore into the Git repos?
...mally yes, .gitignore is useful for everyone who wants to work with the repository. On occasion you'll want to ignore more private things (maybe you often create LOG or something. In those cases you probably don't want to force that on anyone else.
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How to count the number of files in a directory using Python
...
os.listdir() will be slightly more efficient than using glob.glob. To test if a filename is an ordinary file (and not a directory or other entity), use os.path.isfile():
import os, os.path
# simple version for working with...
Sound alarm when code finishes
...uency in Hz and the duration is in milliseconds.
On Linux and Mac
import os
duration = 1 # seconds
freq = 440 # Hz
os.system('play -nq -t alsa synth {} sine {}'.format(duration, freq))
In order to use this example, you must install sox.
On Debian / Ubuntu / Linux Mint, run this in your termin...
How to insert a newline in front of a pattern?
...
This works in bash and zsh, tested on Linux and OS X:
sed 's/regexp/\'$'\n/g'
In general, for $ followed by a string literal in single quotes bash performs C-style backslash substitution, e.g. $'\t' is translated to a literal tab. Plus, sed wants your newline literal to...
How to detect if app is being built for device or simulator in Swift
...e-C we can know if an app is being built for device or simulator using macros:
20 Answers
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Convert string to integer type in Go?
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For example,
package main
import (
"flag"
"fmt"
"os"
"strconv"
)
func main() {
flag.Parse()
s := flag.Arg(0)
// string to int
i, err := strconv.Atoi(s)
if err != nil {
// handle error
fmt.Println(err)
os.Exit(2)
}
fmt...
Why is printing to stdout so slow? Can it be sped up?
... logging I decided to look into it and was quite surprised to find that almost all the time spent is waiting for the terminal to process the results.
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App Inventor 2 控制代码块 · App Inventor 2 中文网
...的三元运算符 ( ? : )。
执行模块 & 返回结果
有时，在一个过程或另一个代码块中，你可能需要执行某些操作并返回某些内容，但出于各种原因，你可能会选择使用此块而不是创建新过程。
求值但忽略结果
提供“虚拟插...
打字机效果 · App Inventor 2 中文网
App教程 帮助 应用介绍
做一个趣味App，模拟打字机效果，在屏幕上一个一个汉字蹦出，同时播放打字机的音效，非常有趣，小朋友们快来试试吧！
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打...