大约有 36,000 项符合查询结果（耗时：0.1214秒） [XML]
Regex exactly n OR m times
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answered Dec 14 '12 at 8:10
Mark ByersMark Byers
683k155155 gold badges14681468 silver badges13881388 bronze badges
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Can a pointer to base point to an array of derived objects?
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150
You cannot index like that. You have allocated an array of Rectangles and stored a pointer to th...
Border around tr element doesn't show?
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260
Add this to the stylesheet:
table {
border-collapse: collapse;
}
JSFiddle.
The reason why ...
POST data in JSON format
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170
Not sure if you want jQuery.
var form;
form.onsubmit = function (e) {
// stop the regular fo...
Read and overwrite a file in Python
...ilename, 'r+')
text = f.read()
text = re.sub('foobar', 'bar', text)
f.seek(0)
f.write(text)
f.truncate()
f.close()
The functionality will likely also be cleaner and safer using open as a context manager, which will close the file handler, even if an error occurs!
with open(filename, 'r+') as f:
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Float right and position absolute doesn't work together
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Use
position:absolute;
right: 0;
No need for float:right with absolute positioning
Also, make sure the parent element is set to position:relative;
share
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Increase number of axis ticks
...continuous. For example:
library(ggplot2)
dat <- data.frame(x = rnorm(100), y = rnorm(100))
ggplot(dat, aes(x,y)) +
geom_point()
Gives you this:
And overriding the scales can give you something like this:
ggplot(dat, aes(x,y)) +
geom_point() +
scale_x_continuous(breaks = round(seq(m...
Select a Dictionary with LINQ
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edited Mar 6 '09 at 0:30
answered Mar 6 '09 at 0:23
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Using IQueryable with Linq
...etProducts();
var productsOver25 = products.Where(p => p.Cost >= 25.00);
What happens here, is the database loads all of the products, and passes them across the wire to your program. Your program then filters the data. In essence, the database does a SELECT * FROM Products, and returns E...
Why do I need 'b' to encode a string with Base64?
...s 8-bit binary byte data and encodes it uses only the characters A-Z, a-z, 0-9, +, /* so it can be transmitted over channels that do not preserve all 8-bits of data, such as email.
Hence, it wants a string of 8-bit bytes. You create those in Python 3 with the b'' syntax.
If you remove the b, it be...