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Efficient way to apply multiple filters to pandas DataFrame or Series
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250
Pandas (and numpy) allow for boolean indexing, which will be much more efficient:
In [11]: df...
Java how to replace 2 or more spaces with single space in string and delete leading and trailing spa
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29 Answers
29
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View the Task's activity stack
...ivity:
Activities in Current Activity Manager State:
* TaskRecord{44d07218 #4 A android.task.contacts}
clearOnBackground=true numActivities=2 rootWasReset=true
affinity=android.task.contacts
intent={act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10600000 ...
How to host a Node.Js application in shared hosting [closed]
...ename the folder for simplicity
exec('mv node-v0.10.33-linux-x86 node');
2) The same way install your node app, e.g. jt-js-sample, using npm:
<?php
exec('node/bin/npm install jt-js-sample');
3) Run the node app from PHP:
<?php
//Choose JS file to run
$file = 'node_modules/jt-js-sample/in...
List comprehension rebinds names even after scope of comprehension. Is this right?
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172
List comprehensions leak the loop control variable in Python 2 but not in Python 3. Here's Guid...
Split column at delimiter in data frame [duplicate]
...as.character(FOO), '|', fixed=TRUE))))
Which produces:
ID FOO.X1 FOO.X2
1 11 a b
2 12 b c
3 13 x y
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How to avoid explicit 'self' in Python?
...ember or not:
class A(some_function()):
def f(self):
self.member = 42
self.method()
That's the complete code! (some_function returns the type used as a base.)
Another, where the methods of a class are dynamically composed:
class B(object):
pass
print B()
# <__main__.B object at...
Javascript and regex: split string and keep the separator
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answered Aug 17 '12 at 8:01
JonJon
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The modulo operation on negative numbers in Python
...the denominator (divisor). Your expression yields 3 because
(-5) / 4 = -1.25 --> floor(-1.25) = -2
(-5) % 4 = (-2 × 4 + 3) % 4 = 3.
It is chosen over the C behavior because a nonnegative result is often more useful. An example is to compute week days. If today is Tuesday (day #2), what is the...