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App Inventor 2 控制代码块 · App Inventor 2 中文网
...another screen）
打开另一屏幕并传值（open another screen with start value）
获取初始文本值（get plain start text）
获取初始值（get start value）
关闭屏幕（close screen）
关闭屏幕并返回文本（close screen with plain text）
关闭屏幕并返回...
“No X11 DISPLAY variable” - what does it mean?
...p.
Actually, I'm surprised it isn't set automatically. Are you trying to start this application from a non-graphic terminal? If not, have you modified the default .profile, .login, .bashrc or .cshrc?
Note that setting the DISPLAY to :0.0 pre-supposes that you're sitting at the main display, as I...
Convert pandas timezone-aware DateTimeIndex to naive timestamp, but in certain timezone
...own question, this functionality has been added to pandas in the meantime. Starting from pandas 0.15.0, you can use tz_localize(None) to remove the timezone resulting in local time.
See the whatsnew entry: http://pandas.pydata.org/pandas-docs/stable/whatsnew.html#timezone-handling-improvements
So w...
Playing .mp3 and .wav in Java?
..."music.wav"));
Clip clip = AudioSystem.getClip();
clip.open(audioIn);
clip.start();
And play .mp3 with jLayer
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Calculating a directory's size using Python?
...is walks all sub-directories; summing file sizes:
import os
def get_size(start_path = '.'):
total_size = 0
for dirpath, dirnames, filenames in os.walk(start_path):
for f in filenames:
fp = os.path.join(dirpath, f)
# skip if it is symbolic link
if...
How do I compile and run a program in Java on my Mac?
...attempt to call when you tell it to execute your program. Think of it as a starting point for your program. The System.out.println() method will print a line of text to the screen, "Hello World!" in this example.
Using the Compiler
Now that you have written a simple Java program, you need to compi...
Can I specify a custom location to “search for views” in ASP.NET MVC?
...sure you remember to register the view engine by modifying the Application_Start method in your Global.asax.cs
protected void Application_Start()
{
ViewEngines.Engines.Clear();
ViewEngines.Engines.Add(new CustomViewEngine());
}
...
How are msys, msys2, and msysgit related to each other?
...'t dead, I would say it's not looking very healthy either. It is a project started by the MinGW team many years ago as a fork of Cygwin that never kept up with Cygwin.
msysgit is a fork of a slightly older version of MSYS with some custom patches, old versions of Bash and Perl and a native port of ...
Why does the order in which libraries are linked sometimes cause errors in GCC?
...ne important detail to this excellent answer: Using "-( archives -)" or "--start-group archives --end-group" is the only sure-fire way of resolving circular dependencies, since each time the linker visits an archive, it pulls in (and registers the unresolved symbols of) only the object files that re...
Python strptime() and timezones?
...See the following example:
In [1]: from datetime import datetime
In [2]: start_time = datetime.strptime('2018-04-18-17-04-30-AEST','%Y-%m-%d-%H-%M-%S-%Z')
In [3]: print("TZ NAME: {tz}".format(tz=start_time.tzname()))
TZ NAME: None
In [4]: start_time = datetime.strptime('2018-04-18-17-04-30-+1000...