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扒了一下源码，ESP8285接入App Inventor有4种玩法，第3种最香 - AI 助手 - ...
...5这个芯片怎么接入App Inventor 2？我翻了MIT的源码和我们fun123的30多个扩展，把所有可行路径都摸了一遍。先说结论：不用开发新扩展，现有组件就能用。
ESP8285是什么？和ESP8266啥关系？
ESP8285是乐鑫(Espressif)出的WiFi芯片，本...
Which is the preferred way to concatenate a string in Python?
... to a string, then to a list:
a += b:
0.10780501365661621
a.append(b):
0.1123361587524414
OK, turns out that even when the resulting string is a million characters long, appending was still faster.
Now let's try with appending a thousand character long string a hundred thousand times:
a += b:
0...
Union of dict objects in Python [duplicate]
...pe(s) for +: 'dict_items' and 'dict_items'".
– Attila123
Apr 23 at 13:14
...
How to convert SecureString to System.String?
... Andrew ArnottAndrew Arnott
72.7k2424 gold badges123123 silver badges162162 bronze badges
...
Regular expression for floating point numbers
...g a floating point number is
[+-]?([0-9]*[.])?[0-9]+
This will match:
123
123.456
.456
See a working example
If you also want to match 123. (a period with no decimal part), then you'll need a slightly longer expression:
[+-]?([0-9]+([.][0-9]*)?|[.][0-9]+)
See pkeller's answer for a fuller...
How to generate all permutations of a list?
...
Combination (order does NOT matter):
print list(itertools.combinations('123', 2))
[('1', '2'), ('1', '3'), ('2', '3')]
Cartesian product (with several iterables):
print list(itertools.product([1,2,3], [4,5,6]))
[(1, 4), (1, 5), (1, 6),
(2, 4), (2, 5), (2, 6),
(3, 4), (3, 5), (3, 6)]
Cartesia...
What is the meaning and difference between subject, user and principal?
...clarify "User - subset of principal"? If John is the subject and "account #123" is his principal, the user is who? Are there two John's? Since Genus > Species > Individual is increasingly specific, John (user) should be more specific than John (subject). Or am I missing something?
...
static const vs #define
...uld be very like to see a comparison table.
– Unknown123
Apr 25 '19 at 3:49
2
...
Best way to pretty print a hash
...\2:"). # "foo": 1 -> foo: 1
gsub(/(^\s*)(".*?"):/, "\\1\\2 =>") # "123": 1 -> "123" => 1
{
a: 1,
"2" => 3,
"3" => nil
}
share
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improve this answer
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...
How to sign an android apk file
...pp -keyalg RSA -keysize 2048 -validity 10000
keystore password : yourApp@123
key password : yourApp@123
CMD O/P
D:\ru\SignedBuilds\MySignedApp>keytool -genkey -v -keystore id.keystore
-alias MySignedApp -keyalg RSA -keysize 2048 -validity 10000
Enter keystore password:
Re-enter new pass...