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Python: Convert timedelta to int in a dataframe
...olumn. Is it possible to use 'datetime.days' or do I need to do something more manual?
4 Answers
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Options for HTML scraping? [closed]
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combine linq with it and it seems more like HTMLSQL, no?
– Bless Yahu
Nov 22 '08 at 20:16
3
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Ruby: How to get the first character of a string
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You can use Ruby's open classes to make your code much more readable. For instance, this:
class String
def initial
self[0,1]
end
end
will allow you to use the initial method on any string. So if you have the following variables:
last_name = "Smith"
first_name = "Joh...
jQuery .scrollTop(); + animation
...ert("Finished animating");
});
Where that alert code is, you can execute more javascript to add in further animation.
Also, the 'swing' is there to set the easing. Check out http://api.jquery.com/animate/ for more info.
s...
How do I find out which keystore was used to sign an app?
... the -jarfile argument was introduced in Java 7; see the documentation for more details.)
Signature of a keystore
keytool -list -v -keystore release.jks
The output will reveal the aliases (entries) in the keystore file release.jks, with the certificate fingerprints (MD5, SHA1 and SHA256).
If th...
Set every cell in matrix to 0 if that row or column contains a 0
... the beginning depend on squares in the end. Maybe my 2nd pass can be made more efficient...
import pprint
m = [[1, 0, 1, 1, 0],
[0, 1, 1, 1, 0],
[1, 1, 1, 1, 1],
[1, 0, 1, 1, 1],
[1, 1, 1, 1, 1]]
N = len(m)
### pass 1
# 1 rst line/column
c = 1
for i in range(N):
c &am...
What uses are there for “placement new”?
...e-allocate memory each time you need a new instance. Instead, it might be more efficient to perform a single allocation for a chunk of memory that can hold multiple objects, even though you don't want to use all of it at once.
DevX gives a good example:
Standard C++ also supports placement
new ope...
Creating a new dictionary in Python
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Why does Java's hashCode() in String use 31 as a multiplier?
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Java: Multiple class declarations in one file
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