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Pythonic way to check if a file exists? [duplicate]
...h, 'a'): pass
(in Python 2.6 or better; in 2.5, this requires an "import from the future" at the top of your module).
If, on the other hand, you want to leave the file alone if it exists, but put specific non-empty contents there otherwise, then more complicated approaches based on if os.path.isf...
Passing arguments to an interactive program non-interactively
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Many ways
pipe your input
echo "yes
no
maybe" | your_program
redirect from a file
your_program < answers.txt
use a here document (this can be very readable)
your_program << ANSWERS
yes
no
maybe
ANSWERS
use a here string
your_program <<< $'yes\nno\nmaybe\n'
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Matching a space in regex
...preceding or following spaces.
For PHP specifically, this page may help.
From your edit, it appears you want to remove all non valid characters The start of this is (note the space inside the regex):
$newtag = preg_replace ("/[^a-zA-Z0-9 ]/", "", $tag);
# ^ spac...
How to update a record using sequelize for node?
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From what I've read in the API docs this is the preferred method.
– Michael J. Calkins
Jun 16 '14 at 22:36
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Why is sizeof considered an operator?
...t-expression.) And I hate the way that comment Markdown works differently from Q&A Markdown!
– Jonathan Leffler
May 30 '17 at 1:13
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Officially, what is typename for?
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Following is the quote from Josuttis book:
The keyword typename was introduced to
specify that the identifier that
follows is a type. Consider the
following example:
template <class T>
Class MyClass
{
typename T::SubType * ptr;
...
How to run `rails generate scaffold` when the model already exists?
...me:string lname:string bdate:date email:string encrypted_password:string
from your schema.rb our your renamed schema.rb. Check it
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How to configure the web.config to allow requests of any length
I am building a site in which i would like to create a file client side from the value of a textarea element.
9 Answers
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#include in .h or .c / .cpp?
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@user9379 That will prevent it from being included more than once per .c or .cpp file. Each .c or .cpp file is generally build individually though, which means a .h will be re-parsed for each .c or .cpp file you compile.
– Brendan Lon...
“webxml attribute is required” error in Maven
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I just updated the maven war plugin from 2.1.1 to 2.4, and the need to make explicit the default location wen away.
– xverges
May 22 '14 at 13:59
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