大约有 15,630 项符合查询结果（耗时：0.0364秒） [XML]
How can I force division to be floating point? Division keeps rounding down to 0?
...ommended for Python 2
Commonly seen is a / float(b). This will raise a TypeError if b is a complex number. Since division with complex numbers is defined, it makes sense to me to not have division fail when passed a complex number for the divisor.
>>> 1 / float(2)
0.5
>>> 1 / float...
Check existence of directory and create if doesn't exist
...nDir, subDir))
} else {
cat("subDir does not exist")
# Handle this error as appropriate
}
Also be aware that if ~/foo doesn't exist then a call to dir.create('~/foo/bar') will fail unless you specify recursive = TRUE.
...
Link to “pin it” on pinterest without generating a button
... I upvoted this answer, but later found that pinterest throws an error when trying to pin: Parameter 'method' (value link) is not one of unknown, uploaded, scraped, bookmarklet, email, iphone, button, ipad, android, android_tablet, api_sdk, extension, api_other, bad.. The solution is to ke...
Detect and exclude outliers in Pandas data frame
...
Got error: "TypeError: unsupported operand type(s) for /: 'str' and 'int'"
– sak
Jul 19 '19 at 4:41
...
Removing an element from an Array (Java) [duplicate]
...lt.add(item);
return result.toArray(input);
}
NB: This is untested. Error checking is left as an exercise to the reader (I'd throw IllegalArgumentException if either input or deleteMe is null; an empty list on null list input doesn't make sense. Removing null Strings from the array might make...
Apache is downloading php files instead of displaying them
...tion: I assume that you have installed PHP5 already and still getting this error.
$ sudo su
$ a2enmod php5
This is it.
But If you are still getting the error :
Config file php5.conf not properly enabled: /etc/apache2/mods-enabled/php5.conf is a real file, not touching it
then do the following...
How to download HTTP directory with all files and sub-directories as they appear on the online files
...
I get this error 'wget' is not recognized as an internal or external command, operable program or batch file.
– hamish
Mar 5 '17 at 1:42
...
sed edit file in place
...
Note that on OS X you might get strange errors like "invalid command code" or other strange errors when running this command. To fix this issue try
sed -i '' -e "s/STRING_TO_REPLACE/STRING_TO_REPLACE_IT/g" <file>
This is because on the OSX version of sed...
Meaning of @classmethod and @staticmethod for beginner? [duplicate]
...(and its attributes.)
Not accepting at least one argument is a TypeError.
Not understanding the semantics of that argument is a user error.
"""
return some_function_f(self)
@classmethod
def a_class_method(cls):
"""A function of a class has access to e...
What is the meaning of “this” in Java?
...
This isn't working. I get an error saying that a main method is required. If i add the main method, then I have to call from there. And any attempt to call frobnicate() inside main says that you can't call a non-static reference from inside a static on...