大约有 45,000 项符合查询结果（耗时：0.0601秒） [XML]
How do I get Flask to run on port 80?
...
So it's throwing up that error message because you have apache2 running on port 80.
If this is for development, I would just leave it as it is on port 5000.
If it's for production either:
Not Recommended
Stop apache2 first;
Not recommended as it states in the documentation:
...
Shorthand way for assigning a single field in a record, while copying the rest of the fields?
..., b :: Int, c :: String } -- define a Foo
> let foo = Foo { a = 1, b = 2, c = "Hello" } -- create a Foo
> let updateFoo x = x { c = "Goodbye" } -- function to update Foos
> updateFoo foo -- update the Foo
Foo {a = 1, b = 2, c = "G...
Vim: How to insert in visual block mode?
...
210
Try this
After selecting a block of text, press Shift+i or capital I.
Lowercase i will not wor...
Remove substring from the string
...
264
You can use the slice method:
a = "foobar"
a.slice! "foo"
=> "foo"
a
=> "bar"
there i...
Prevent any form of page refresh using jQuery/Javascript
...
192
#1 can be implemented via window.onbeforeunload.
For example:
<script type="text/javascri...
ElasticSearch - Return Unique Values
...thing like:
{
"took" : 16,
"timed_out" : false,
"_shards" : {
"total" : 2,
"successful" : 2,
"failed" : 0
},
"hits" : {
"total" : 1000000,
"max_score" : 0.0,
"hits" : [ ]
},
"aggregations" : {
"langs" : {
"buckets" : [ {
"key" : "10",
"doc_count" : 244812
}, {
"key...
PHP - iterate on string characters
...rray using the str_split function
$array = str_split($your_string);
Step 2: loop through the newly created array
foreach ($array as $char) {
echo $char;
}
You can check the PHP docs for more information: str_split
shar...
Convert string to binary in python
...
127
Something like this?
>>> st = "hello world"
>>> ' '.join(format(ord(x), 'b')...
Compare object instances for equality by their attributes
...at before Python 3, you may need to use __cmp__ instead of __eq__. Python 2 users may also want to implement __ne__, since a sensible default behaviour for inequality (i.e. inverting the equality result) will not be automatically created in Python 2.
...
Python, remove all non-alphabet chars from string
...
123
Use re.sub
import re
regex = re.compile('[^a-zA-Z]')
#First parameter is the replacement, sec...