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mysql update column with value from another table
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@frijj2k would this still be slow if .name is indexed on both tables?
– Steverino
Jan 6 '17 at 17:17
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how to get first three characters of an NSString?
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mystr=[mystr substringToIndex:3];
Be sure your string has atleast 3 ch.. o.e. it will crash the app.
Here are some other links to check NSsting operations...
Link1
Link2
Apple Link
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How to remove the first Item from a list?
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Python List
list.pop(index)
>>> l = ['a', 'b', 'c', 'd']
>>> l.pop(0)
'a'
>>> l
['b', 'c', 'd']
>>>
del list[index]
>>> l = ['a', 'b', 'c', 'd']
>>> del l[0]
>>> l
['b', 'c', 'd'...
How to communicate between iframe and the parent site?
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We can even use window.frames[index] to get child frame (<iframe>, <object>, <frame>), equivalent to getElementsByTagName("iframe")[index].contentWindow. To get Parent Window Object from IFrames, it is better to use window.parent, as win...
Can I have multiple background images using CSS?
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CSS3 allows this sort of thing and it looks like this:
body {
background-image: url(images/bgtop.png), url(images/bg.png);
background-repeat: repeat-x, repeat;
}
The current versions of all the major browsers now suppor...
Appending to an empty DataFrame in Pandas?
...re the output if you want it:
>>> df
Empty DataFrame
Columns: []
Index: []
>>> df = df.append(data)
>>> df
A
0 0
1 1
2 2
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Is Java Regex Thread Safe?
...riables including the text that is being matched, arrays for groups, a few indexes for maintain location and a few booleans for other state. This all points to a stateful Matcher that would not behave well if accessed by multiple Threads. So does the JavaDoc:
Instances of this class are not s...
n-grams in python, four, five, six grams?
... izip, islice, tee
s = 'spam and eggs'
N = 3
trigrams = izip(*(islice(seq, index, None) for index, seq in enumerate(tee(s, N))))
list(trigrams)
# [('s', 'p', 'a'), ('p', 'a', 'm'), ('a', 'm', ' '),
# ('m', ' ', 'a'), (' ', 'a', 'n'), ('a', 'n', 'd'),
# ('n', 'd', ' '), ('d', ' ', 'e'), (' ', 'e', 'g...
How to split a string at the first `/` (slash) and surround part of it in a ``?
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Instead of using substring with a fixed index, you'd better use replace :
$("#date").html(function(t){
return t.replace(/^([^\/]*\/)/, '<span>$1</span><br>')
});
One advantage is that it would still work if the first / is at a different pos...
how to compare two elements in jquery [duplicate]
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@mikeycgto using array index notation is the same as .get(), not .eq(). they are very different.
– Kevin B
Feb 5 '13 at 15:19
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