大约有 10,000 项符合查询结果（耗时：0.0136秒） [XML]
When to wrap quotes around a shell variable?
...
In short, quote everything where you do not require the shell to perform token splitting and wildcard expansion.
Single quotes protect the text between them verbatim. It is the proper tool when you need to ensure that the shell does not touch the string at all. Typically, it is the quoting...
Using {} in a case statement. Why?
...ic storage duration is not in scope to a point where it is in scope is ill-formed unless the variable has scalar type, class type with a trivial default constructor and a trivial destructor, a cv-qualified version of one of these types, or an array of one of the preceding types and is declared witho...
View the Task's activity stack
...astActiveTime=288203177 (inactive for 14s)
* Hist #8: HistoryRecord{44b87a30 com.android.contacts/.ViewContactActivity}
packageName=com.android.contacts processName=android.process.acore
launchedFromUid=10004 app=ProcessRecord{44c4f348 1168:android.process.acore/10004}
In...
What is the use case of noop [:] in bash?
I searched for noop in bash (:), but was not able to find any good information. What is the exact purpose or use case of this operator?
...
Merge PDF files
..._streams:
f.close()
if __name__ == '__main__':
if sys.platform == "win32":
import os, msvcrt
msvcrt.setmode(sys.stdout.fileno(), os.O_BINARY)
pdf_cat(sys.argv[1:], sys.stdout)
share
...
Access parent URL from iframe
...ication, maybe SAML), and then Domain 3 directs back to Domain 2 (i.e. via form submission(), a standard SAML technique)
For the child iframe the document.referrer will be Domain 3, not the containing Domain 1
document.location refers to "a Location object, which contains information about the URL...
PHP: How to generate a random, unique, alphanumeric string for use in a secret link?
...t transaction id.
A UUID is a 16-octet (128-bit) number. In its canonical form, a UUID is represented by 32 hexadecimal digits, displayed in five groups separated by hyphens, in the form 8-4-4-4-12 for a total of 36 characters (32 alphanumeric characters and four hyphens).
function generate_uuid()...
Writing a git post-receive hook to deal with a specific branch
...
A post-receive hook gets its arguments from stdin, in the form <oldrev> <newrev> <refname>. Since these arguments are coming from stdin, not from a command line argument, you need to use read instead of $1 $2 $3.
The post-receive hook can receive multiple branches...
Get all unique values in a JavaScript array (remove duplicates)
...
96 Answers
96
Active
...
Normalize data in pandas
...C -5.569493 4.672679 -2.168464 -9.315900
D 8.892368 0.932785 4.535396 0.598124
In [93]: df_norm = (df - df.mean()) / (df.max() - df.min())
In [94]: df_norm
Out[94]:
a b c d
A 0.085789 -0.394348 0.337016 -0.109935
B -0.463830 0.164926 -0.650963 0.25671...