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App Inventor 2 扩展 · App Inventor 2 中文网
...omponents can be distributed on the Web and loaded into App Inventor dynamically: they do not have to be built into the App Inventor system, and they can be imported into projects as needed. With extensions, the range of App Inventor apps can be virtually unlimited.
One use of extensions, for exa...
How can I pass data from Flask to JavaScript in a template?
My app makes a call to an API that returns a dictionary. I want to pass information from this dict to JavaScript in the view. I am using the Google Maps API in the JS, specifically, so I'd like to pass it a list of tuples with the long/lat information. I know that render_template will pass these ...
How do I print the elements of a C++ vector in GDB?
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With GCC 4.1.2, to print the whole of a std::vector<int> called myVector, do the following:
print *(myVector._M_impl._M_start)@myVector.size()
To print only the first N elements, do:
print *(myVector._M_impl._M_start)@N
Explanation
This is probably heavily dependent on your ...
Permanently adding a file path to sys.path in Python
I had a file called example_file.py , which I wanted to use from various other files, so I decided to add example_file.py to sys.path and import this file in another file to use the file. To do so, I ran the following in IPython.
...
In CoffeeScript how do you append a value to an Array?
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If you are chaining calls then you want the append to return the array rather than it's length.
In this case you can use .concat([newElement])
Has to be [newElement] as concat is expecting an array like the one its concatenating to.
Not efficie...
API Keys vs HTTP Authentication vs OAuth in a RESTful API
... they are trying to do?
or all three?
If you just need to identify the caller to keep track of volume or number of API Calls, use a simple API Key. Bear in mind that if the user you have issued the API key shares it with someone else, they will be able to call your API as well.
But, if you need...
Why is an int in OCaml only 31 bits?
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This is called a tagged pointer representation, and is a pretty common optimization trick used in many different interpreters, VMs and runtime systems for decades. Pretty much every Lisp implementation uses them, many Smalltalk VMs, ...
How can I merge two hashes without overwritten duplicate keys in Ruby?
...sly, this is very rudimentary and assumes that hash1 doesn't have any keys called "hash2-originated-whatever" - you may be better off just adding a number to the key so it becomes key1, key2 and so on until you hit on one that isn't already in hash1. Also, I haven't done any ruby for a few months so...
Batch file to copy directories recursively
... you exact control of what you do in every nested subdirectory:
@echo off
call :treeProcess
goto :eof
:treeProcess
rem Do whatever you want here over the files of this subdir, for example:
copy *.* C:\dest\dir
for /D %%d in (*) do (
cd %%d
call :treeProcess
cd ..
)
exit /b
Windows Ba...
How to plot multiple functions on the same figure, in Matplotlib?
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Nevermind, the default figure is automatically cleared after calling plt.show() so plotting again won't plot on the same graph.
– NoName
Dec 16 '19 at 5:24
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