大约有 40,000 项符合查询结果（耗时：0.0776秒） [XML]
Get index of array element faster than O(n)
...['a', 'b', 'c']
hash = Hash[array.map.with_index.to_a] # => {"a"=>0, "b"=>1, "c"=>2}
hash['b'] # => 1
share
|
improve this answer
|
follow
|...
How to set up a cron job to run an executable every hour?
...
0 * * * * cd folder_containing_exe && ./exe_name
should work unless there is something else that needs to be setup for the program to run.
...
How to iterate over a JavaScript object?
...
906
For most objects, use for .. in :
for (let key in yourobject) {
console.log(key, yourobject[...
pip install from git repo branch
... git+https://github.com/tangentlabs/django-oscar-paypal.git@issue/34/oscar-0.6
And specify the branch name without the leading /.
share
|
improve this answer
|
follow
...
“is” operator behaves unexpectedly with integers
...
403
Take a look at this:
>>> a = 256
>>> b = 256
>>> id(a)
9987148
>...
MongoDB数据导出导入工具：mongoexport,mongoimport - 大数据 & AI - 清泛...
...，集合中数据如下：
> db.students.find()
{ "_id" : ObjectId("5031143350f2481577ea81e5"), "classid" : 1, "age" : 20, "name" : "kobe" }
{ "_id" : ObjectId("5031144a50f2481577ea81e6"), "classid" : 1, "age" : 23, "name" : "nash" }
{ "_id" : ObjectId("5031145a50f2481577ea81e7"), "classid" :...
Padding characters in printf
...ength of the second string if you want ragged-right lines.
pad=$(printf '%0.1s' "-"{1..60})
padlength=40
string2='bbbbbbb'
for string1 in a aa aaaa aaaaaaaa
do
printf '%s' "$string1"
printf '%*.*s' 0 $((padlength - ${#string1} - ${#string2} )) "$pad"
printf '%s\n' "$string2"
str...
How would one write object-oriented code in C? [closed]
... community wiki
6 revs, 6 users 50%mepcotterell
28
...
Replacing all non-alphanumeric characters with empty strings
...
250
Use [^A-Za-z0-9].
Note: removed the space since that is not typically considered alphanumeric....