大约有 40,000 项符合查询结果（耗时：0.0471秒） [XML]
What is the most efficient way of finding all the factors of a number in Python?
Can someone explain to me an efficient way of finding all the factors of a number in Python (2.7)?
22 Answers
...
Need to reset git branch to origin version
...one command: git switch.
Namely: git switch -C mybranch origin/mybranch
Example
C:\Users\vonc\git\git>git switch -C master origin/master
Reset branch 'master'
Branch 'master' set up to track remote branch 'master' from 'origin'.
Your branch is up to date with 'origin/master'.
That restores th...
When should I make explicit use of the `this` pointer?
...stion, but I don't understand why i might not exist in A. Could I get an example?
– Cam Jackson
Dec 19 '13 at 1:08
1
...
What is output buffering?
What is output buffering and why is one using it in PHP?
7 Answers
7
...
How can you diff two pipelines in Bash?
...with 2 tmp files (not what you want) would be:
foo | bar > file1.txt && baz | quux > file2.txt && diff file1.txt file2.txt
With bash, you might try though:
diff <(foo | bar) <(baz | quux)
foo | bar | diff - <(baz | quux) # or only use process substitution once...
Is Java “pass-by-reference” or “pass-by-value”?
...
Java is always pass-by-value.
Unfortunately, we never handle an object at all, instead juggling object-handles called references (which are passed by value of course). The chosen terminology and semantics easily confuse many beginners.
It goes like this:
public static void main(String[] args) {
...
How to make a class JSON serializable
...t;>> magic(f)
'{"fname": "/foo/bar"}'
In that case you can merely call json.dumps(f.__dict__).
If you want more customized output then you will have to subclass JSONEncoder and implement your own custom serialization.
For a trivial example, see below.
>>> from json import JSONE...
Python: split a list based on a condition?
What's the best way, both aesthetically and from a performance perspective, to split a list of items into multiple lists based on a conditional? The equivalent of:
...
What's the difference between [ and [[ in Bash? [duplicate]
... handles empty strings and strings with whitespace more intuitively. For example, with [ you have to write
if [ -f "$file" ]
to correctly handle empty strings or file names with spaces in them. With [[ the quotes are unnecessary:
if [[ -f $file ]]
Because it is a syntactical feature, it lets yo...
Rename multiple files in a directory in Python [duplicate]
...e script itself. Instead of using . as the dir, you could make a variable called dir and use that, then prepend dir to the filename.
– styfle
May 18 '11 at 5:53
18
...