大约有 44,000 项符合查询结果（耗时：0.0626秒） [XML]
Is there an easy way to return a string repeated X number of times?
... of indentations before a string based on an items depth and I'm wondering if there is a way to return a string repeated X times. Example:
...
Return a value if no rows are found in Microsoft tSQL
Using a Microsoft version of SQL, here's my simple query. If I query a record that doesn't exist then I will get nothing returned. I'd prefer that false (0) is returned in that scenario. Looking for the simplest method to account for no records.
...
Breaking out of nested loops [duplicate]
...ing over a list of sentences and using several for loops to filter out specific sentences based on existence of specific words or numbers, before doing the actual work at the end of the outer for loop.
– Anthon
Oct 4 '12 at 6:51
...
Python: most idiomatic way to convert None to empty string?
...
If you actually want your function to behave like the str() built-in, but return an empty string when the argument is None, do this:
def xstr(s):
if s is None:
return ''
return str(s)
...
Is it Pythonic to use list comprehensions for just side effects?
...way (I have been known to use a genex in the for before, to get rid of the if).
– Ignacio Vazquez-Abrams
Apr 22 '11 at 8:34
6
...
How do I create directory if none exists using File class in Ruby?
...
You can use FileUtils to recursively create parent directories, if they are not already present:
require 'fileutils'
dirname = File.dirname(some_path)
unless File.directory?(dirname)
FileUtils.mkdir_p(dirname)
end
Edit: Here is a solution using the core libraries only (reimplementin...
Can you use if/else conditions in CSS?
...
Not in the traditional sense, but you can use classes for this, if you have access to the HTML. Consider this:
<p class="normal">Text</p>
<p class="active">Text</p>
and in your CSS file:
p.normal {
background-position : 150px 8px;
}
p.active {
background-p...
Find a file in python
I have a file that may be in a different place on each user's machine. Is there a way to implement a search for the file? A way that I can pass the file's name and the directory tree to search in?
...
not None test in Python [duplicate]
...
if val is not None:
# ...
is the Pythonic idiom for testing that a variable is not set to None. This idiom has particular uses in the case of declaring keyword functions with default parameters. is tests identity in Pyt...
Best way to check if a URL is valid
I want to use PHP to check, if string stored in $myoutput variable contains a valid link syntax or is it just a normal text. The function or solution, that I'm looking for, should recognize all links formats including the ones with GET parameters.
...