大约有 42,000 项符合查询结果（耗时：0.0688秒） [XML]
How to check if a file exists in Documents folder?
...
Swift 3:
let documentsURL = try! FileManager().url(for: .documentDirectory,
in: .userDomainMask,
appropriateFor: nil,
create: true)
... gives you a f...
data.table vs dplyr: can one do something well the other can't or does poorly?
...ese aspects to provide a comprehensive answer/comparison (in no particular order of importance): Speed, Memory usage, Syntax and Features.
My intent is to cover each one of these as clearly as possible from data.table perspective.
Note: unless explicitly mentioned otherwise, by referring to dpl...
Should Jquery code go in header or footer?
Where is the best place to put Jquery code (or separate Jquery file)? Will pages load faster if I put it in the footer?
9 ...
SQL Server Text type vs. varchar data type [closed]
I have variable length character data and want to store in SQL Server (2005) database. I want to learn some best practices about how to choose TEXT SQL type or choose VARCHAR SQL type, pros and cons in performance/footprint/function.
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JavaScript Editor Plugin for Eclipse [duplicate]
Is there an Eclipse plugin available for JavaScript that allows for syntax checking and autosuggestions for .js files in Eclipse?
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Default string initialization: NULL or Empty? [closed]
...s to NULL, with the thinking that NULL means the absence of a value and "" or String.Empty is a valid value. I have seen more examples lately of code where String.Empty is considered the default value or represents no value. This strikes me as odd, with the newly added nullable types in c# it seem...
Constructor function vs Factory functions
Can someone clarify the difference between a constructor function and a factory function in Javascript.
7 Answers
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How do you read from stdin?
...
You could use the fileinput module:
import fileinput
for line in fileinput.input():
pass
fileinput will loop through all the lines in the input specified as file names given in command-line arguments, or the standard input if no arguments are provided.
Not...
Jinja2 template variable if None Object set a default value
...
Use the none builtin function (http://jinja.pocoo.org/docs/templates/#none):
{% if p is not none %}
{{ p.User['first_name'] }}
{% else %}
NONE
{%endif %}
or
{{ p.User['first_name'] if p != None else 'NONE' }}
or if you need an empty string:
{{ p.User['first...
fatal: could not read Username for 'https://github.com': No such file or directory
...setup SSH keys here: https://help.github.com/articles/generating-ssh-keys
OR
git remote add origin https://{username}:{password}@github.com/{username}/project.git
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