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How do I add a placeholder on a CharField in Django?
...
Look at the widgets documentation. Basically it would look like:
q = forms.CharField(label='search',
widget=forms.TextInput(attrs={'placeholder': 'Search'}))
More writing, yes, but the separation allows for better abstraction of more complic...
Batch files: How to read a file?
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This is a pretty complex example, parsing very specific information from a particularly formatted text file, without giving any explanation. As per for /? the command would parse each line in myfile.txt, ignoring lines that begin with a semicolon, pass...
Continuously read from STDOUT of external process in Ruby
...iven by blender line by line to update a progress bar in a GUI. It's not really important that blender is the external process whose stdout I need to read.
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What are all the common ways to read a file in Ruby?
... buf.unpack('H*')
end
end
Finally you can do it without a block, for example when processing multiple files simultaneously. In that case the file must be explicitly closed (improved as per comment of @antinome):
begin
f = File.open 'file.txt'
while line = f.gets
puts line
end
ensure
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SQL: deleting tables with prefix
...e MySQL to construct the statement for you:
In the MySQL shell or through PHPMyAdmin, use the following query
SELECT CONCAT( 'DROP TABLE ', GROUP_CONCAT(table_name) , ';' )
AS statement FROM information_schema.tables
WHERE table_name LIKE 'myprefix_%';
This will generate a DROP stateme...
How do you connect to multiple MySQL databases on a single webpage?
...a few databases and want to put all the information onto one webpage using PHP. I was wondering how I can connect to multiple databases on a single PHP webpage.
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In Python how should I test if a variable is None, True or False
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a = 'foo' if a: print 'its true' a is not actually TRUE, it's just not none
– wesm
Apr 3 '15 at 21:06
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iPhone Safari Web App opens links in new window
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Is there an example of the opposite? Forcing an iPhone web app to open a page in Safari eventhough it's a javascript location change?
– tkahn
Jan 4 '12 at 16:23
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How do I use the ternary operator ( ? : ) in PHP as a shorthand for “if / else”?
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PHP 7+
As of PHP 7, this task can be performed simply by using the Null coalescing operator like this :
echo !empty($address['street2']) ?? 'Empty';
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Bootstrap 3 and Youtube in Modal
...;
</html>
visit (link broken): https://parrot-tutorial.com/run_code.php?snippet=bs4_modal_youtube
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