大约有 41,000 项符合查询结果（耗时：0.0559秒） [XML]
Emacs: print key binding for a command or list all key bindings
...
C-h f (or M-x describe-function) will show you the bindings for a command.
You are correct, C-h b (or M-x describe-bindings) will show you all bindings. C-h m (M-x describe-mode) is also handy to list bindings by mode.
You might a...
bash: mkvirtualenv: command not found
...
Solution 1:
For some reason, virtualenvwrapper.sh installed in /usr/bin/virtualenvwrapper.sh, instead of under /usr/local/bin.
The following in my .bash_profile works...
source "/usr/bin/virtualenvwrapper.sh"
export WORKON_HOME="/opt/vi...
In Python how should I test if a variable is None, True or False
...ulate(open("myfile"))
except SimulationException as sim_exc:
print "error parsing stream", sim_exc
else:
if result:
print "result pass"
else:
print "result fail"
# execution continues from here, regardless of exception or not
And now you can have a much richer type of ...
Testing whether a value is odd or even
...cided to create simple isEven and isOdd function with a very simple algorithm:
22 Answers
...
Can (domain name) subdomains have an underscore “_” in it?
Can subdomains (domain names) have underscore _ in them?
11 Answers
11
...
Choosing a stand-alone full-text search server: Sphinx or SOLR? [closed]
I'm looking for a stand-alone full-text search server with the following properties:
5 Answers
...
is_file or file_exists in PHP
...
is_file() will return false if the given path points to a directory. file_exists() will return true if the given path points to a valid file or directory. So it would depend entirely on your needs. If you want to know specifically if it's a file or not, use is_file(). Otherwise, use file_...
Why is “if not someobj:” better than “if someobj == None:” in Python?
...is not already one. Roughly, we are asking the object : are you meaningful or not ? This is done using the following algorithm :
If the object has a __nonzero__ special method (as do numeric built-ins, int and float), it calls this method. It must either return a bool value which is then directly ...
Is proprietary code legally safe on bitbucket or github? [closed]
...lm but its unclear who owns the code if you put proprietary code on github or bitbucket in a private repository.
2 Answers
...
MySQL WHERE: how to write “!=” or “not equals”?
...
The != operator most certainly does exist! It is an alias for the standard <> operator.
Perhaps your fields are not actually empty strings, but instead NULL?
To compare to NULL you can use IS NULL or IS NOT NULL or the null safe e...