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Convert xlsx to csv in Linux with command line
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The Gnumeric spreadsheet application comes with a command line utility called ssconvert that can convert between a variety of spreadsheet formats:
$ ssconvert Book1.xlsx newfile.csv
Using exporter Gnumeric_stf:stf_csv
$ cat newfile.csv
Foo,Bar,Baz
1,2,3
123.6,7.89,
2012/05/14,,
The,last,Line
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Python argparse: Make at least one argument required
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args = vars(parser.parse_args())
if not any(args.values()):
parser.error('No arguments provided.')
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Rails 4: assets not loading in production
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answered Feb 10 '14 at 7:32
Rameshwar VyevhareRameshwar Vyevhare
2,49622 gold badges2121 silver badges2828 bronze badges
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Fastest way to iterate over all the chars in a String
In Java, what would the fastest way to iterate over all the chars in a String, this:
8 Answers
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Mongoose's find method with $or condition does not work properly
...everyone to use Mongoose's query builder language and promises instead of callbacks:
User.find().or([{ name: param }, { nickname: param }])
.then(users => { /*logic here*/ })
.catch(error => { /*error logic here*/ })
Read more about Mongoose Queries.
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How to use SQL Order By statement to sort results case insensitive?
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This usually won't work out of the box, if the database uses UTF8. (Notice that the title doesn't refer to just SQLite.) In this case, the suggestion to use lower() or upper() below is the one that works.
– marc...
Change a Django form field to a hidden field
...get the value.
also you may prefer to use in the view:
form.fields['field_name'].widget = forms.HiddenInput()
but I'm not sure it will protect save method on post.
Hope it helps.
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What is the fastest way to check if a class has a function defined?
...tr() to get the attribute, and callable() to verify it is a method:
invert_op = getattr(self, "invert_op", None)
if callable(invert_op):
invert_op(self.path.parent_op)
Note that getattr() normally throws exception when the attribute doesn't exist. However, if you specify a default value (None...
关于php的socket初探 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...塞的古老模型：属于同步阻塞 IO 模型，代码如下：
socket_server.php
<?php
/**
* SocketServer Class
* By James.Huang <shagoo#gmail.com>
**/
set_time_limit(0);
class SocketServer
{
private static $socket;
function SocketServer($port)
{ ...
Check whether or not the current thread is the main thread
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answered Dec 4 '16 at 15:32
dimo hamdydimo hamdy
2,1112222 silver badges1919 bronze badges
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