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Which is faster in Python: x**.5 or math.sqrt(x)?
... (Python 2.5.2, Windows):
$ python -mtimeit -s"from math import sqrt; x = 123" "x**.5"
1000000 loops, best of 3: 0.445 usec per loop
$ python -mtimeit -s"from math import sqrt; x = 123" "sqrt(x)"
1000000 loops, best of 3: 0.574 usec per loop
$ python -mtimeit -s"import math; x = 123" "math.sqrt(x...
How to represent multiple conditions in a shell if statement?
...
Classic technique (escape metacharacters):
if [ \( "$g" -eq 1 -a "$c" = "123" \) -o \( "$g" -eq 2 -a "$c" = "456" \) ]
then echo abc
else echo efg
fi
I've enclosed the references to $g in double quotes; that's good practice, in general. Strictly, the parentheses aren't needed because the preced...
php中json_decode()和json_encode()的使用方法 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...d"] => int(4)
["e"] => int(5)
}
$data='[
{"Name":"a1","Number":"123","Contno":"000","QQNo":""},
{"Name":"a1","Number":"123","Contno":"000","QQNo":""},
{"Name":"a1","Number":"123","Contno":"000","QQNo":""}
]';
echo json_decode($data);
结果为：
Array ( [0] => stdClass Object ( ...
How do I split a string, breaking at a particular character?
...h JavaScript’s String.prototype.split function:
var input = 'john smith~123 Street~Apt 4~New York~NY~12345';
var fields = input.split('~');
var name = fields[0];
var street = fields[1];
// etc.
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Vertical (rotated) label in Android
...fter looking around, I found yoog568's VerticalTextView class on GitHub:
https://github.com/yoog568/VerticalTextView/blob/master/src/com/yoog/widget/VerticalTextView.java
which I was able to position as desired. You also need to include the following attributes definition in your project:
https:...
Flask-SQLAlchemy how to delete all rows in a single table
...Model.id==123).first()
db.session.delete(record_obj)
db.session.commit()
https://flask-sqlalchemy.palletsprojects.com/en/2.x/queries/#deleting-records
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How to display pandas DataFrame of floats using a format string for columns?
... pd
pd.options.display.float_format = '${:,.2f}'.format
df = pd.DataFrame([123.4567, 234.5678, 345.6789, 456.7890],
index=['foo','bar','baz','quux'],
columns=['cost'])
print(df)
yields
cost
foo $123.46
bar $234.57
baz $345.68
quux $456.79
but this ...
How do I immediately execute an anonymous function in PHP?
...ing "()". Works just like JS thanks to uniform variable evaluation order.
https://3v4l.org/06EL3
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Check if a string contains a number
...
use str.isalpha()
Ref: https://docs.python.org/2/library/stdtypes.html#str.isalpha
Return true if all characters in the string are alphabetic and there
is at least one character, false otherwise.
...
What are the rules for the “…” token in the context of variadic templates?
...eUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 4...