大约有 11,643 项符合查询结果（耗时：0.0291秒） [XML]
How to check for null in Twig?
...ow) to check whether a variable is empty (null, false, empty string/array, etc):
{% if var|default is empty %}
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How to automatically add user account AND password with a Bash script?
....org/wiki/Gecos_field The gecos field, or GECOS field is an entry in the /etc/passwd file on Unix, and similar operating systems. It is typically used to record general information about the account or its user(s) such as their real name and phone number. GECOS means General Electric Comprehensiv...
Is jquery a javascript library or framework? [closed]
...our code when it needs something app specific.
E.g., durandal, ember, etc.
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“for” vs “each” in Ruby
...speaking) keywords don't create new scopes. if, unless, begin, for, while, etc. all work with the current scope. #each however accepts a block. Blocks always add their own scope on top of the current scope. Meaning that declaring a new variable in the block (thus a new scope) will not be accessible ...
Reverse of JSON.stringify?
... prototypes) and only the datatypes supported by JSON (no dates, XML, HTML etc. ) then you're OK.
– Michael Anderson
May 27 '13 at 0:17
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Output data from all columns in a dataframe in pandas [duplicate]
...v parameters to configure column separators, whether the index is printed, etc.
Edit: It is now possible to use None as the target for .to_csv() with similar effect, which is arguably a lot nicer:
paramdata.to_csv(None)
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Generating a PNG with matplotlib when DISPLAY is undefined
...> matplotlib.matplotlib_fname()
# This is the file location in Ubuntu
'/etc/matplotlibrc'
Then modify the backend in that file to backend : Agg. That is it.
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Spring MVC: How to return image in @ResponseBody?
...)
public byte[] testphoto() throws IOException {
InputStream in = servletContext.getResourceAsStream("/images/no_image.jpg");
return IOUtils.toByteArray(in);
}
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System.currentTimeMillis() vs. new Date() vs. Calendar.getInstance().getTime()
... are inherent to dates and times (leap years, daylight savings, timezones, etc.).
It's generally a good idea to deal only with long timestamps or Date objects within your application, and only use Calendar when you actually need to perform date/time calculations, or to format dates for displaying t...
Total size of the contents of all the files in a directory [closed]
...xargs -0 ..." to avoid problems with certain file names (containing spaces etc).
– hlovdal
Aug 6 '09 at 22:23
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