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Associativity of “in” in Python?
... # and note "2 < 1" is also not true
Precedence of python operators: http://docs.python.org/reference/expressions.html#summary
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How to disable UITextField editing but still accept touch?
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swift 4: ` func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool { return false } `
– lionello
Jan 23 '18 at 5:08
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Stylecop vs FXcop
...he wikipedia articles on these provide good summaries of the differences:
http://en.wikipedia.org/wiki/StyleCop
http://en.wikipedia.org/wiki/FxCop
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List of standard lengths for database fields
...TF-8 will fit in four bytes – you are likely to
actually need 12.
https://www.w3.org/International/questions/qa-personal-names
For database fields, VARCHAR(255) is a safe default choice, unless you can actually come up with a good reason to use something else. For typical web applications...
Determine the number of NA values in a column
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If you are looking for NA counts for each column in a dataframe then:
na_count <-sapply(x, function(y) sum(length(which(is.na(y)))))
should give you a list with the counts for each column.
na_count <- data.frame(na_count)
Should output the data nicely in a dataframe like:
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C++0x lambda capture by value always const?
...) -> bool
Refer to this page for fore details (Explanation section):
http://en.cppreference.com/w/cpp/language/lambda
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kernel stack and user space stack
... each thread has its own stack, including both user and kernel threads.
http://linux.derkeiler.com/Mailing-Lists/Kernel/2004-10/3194.html
Why kernel stack is used?
So when we are in kernel mode, stack kind of mechanism is necessary for dealing with function calls, local variables similar to us...
Modify SVG fill color when being served as Background-Image
....svg);
mask-image: url(icon.svg);
}
For more see this great article: https://codepen.io/noahblon/post/coloring-svgs-in-css-background-images
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Default value for field in Django model
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Set editable to False and default to your default value.
http://docs.djangoproject.com/en/stable/ref/models/fields/#editable
b = models.CharField(max_length=7, default='0000000', editable=False)
Also, your id field is unnecessary. Django will add it automatically.
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Adding Only Untracked Files
...command:
git ls-files -o --exclude-standard | select | foreach { git add $_ }
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