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Selecting multiple columns in a pandas dataframe
... is in the
3rd & 4th columns. If you don't know their names when your script runs, you can do this
newdf = df[df.columns[2:4]] # Remember, Python is 0-offset! The "3rd" entry is at slot 2.
As EMS points out in his answer, df.ix slices columns a bit more concisely, but the .columns slicing in...
Javascript: get package.json data in gulpfile.js
...json like you want to read config object you have created in package.json
scripts : {
build: gulp
},
config : {
isClient: false.
}
then you can use
process.env.npm_package_**config_isClient**
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How to automatically generate a stacktrace when my program crashes
...tput, which glibc can use to make a nice stacktrace:
$ gcc -g -rdynamic ./test.c -o test
Executing this gets you this output:
$ ./test
Error: signal 11:
./test(handler+0x19)[0x400911]
/lib64/tls/libc.so.6[0x3a9b92e380]
./test(baz+0x14)[0x400962]
./test(bar+0xe)[0x400983]
./test(foo+0xe)[0x400993...
Python's equivalent of && (logical-and) in an if-statement
...this class which again prints something to track what is happening:
class Test(object):
def __init__(self, value):
self.value = value
def __bool__(self):
print('__bool__ called on {!r}'.format(self))
return bool(self.value)
__nonzero__ = __bool__ # Python 2 co...
Getting the difference between two sets
...
Try this
test2.removeAll(test1);
Set#removeAll
Removes from this set all of its elements that are contained in the specified collection (optional operation). If the specified collection is also a set, this operation effectively ...
Error in : object of type 'closure' is not subsettable
... defined url in your prior R session, but forgot to copy that code to your script.
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Using R to list all files with a specified extension
I'm very new to R and am working on updating an R script to iterate through a series of .dbf tables created using ArcGIS and produce a series of graphs.
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How do you skip a unit test in Django?
How do forcibly skip a unit test in Django?
2 Answers
2
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Why would a JavaScript variable start with a dollar sign? [duplicate]
I quite often see JavaScript with variables that start with a dollar sign. When/why would you choose to prefix a variable in this way?
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How to show vertical line to wrap the line in Vim?
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The vim script representation of the leader key. See Show current <leader> key setting
– Rod
Jun 6 '13 at 13:27
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