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pandas read_csv and filter columns with usecols
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114
The answer by @chip completely misses the point of two keyword arguments.
names is only nece...
Static variables in member functions
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169
Since class A is a non-template class and A::foo() is a non-template function. There will be o...
Python Dictionary to URL Parameters
... key-value pairs, and converts it into a form suitable for a URL (e.g., key1=val1&key2=val2).
If you are using Python3, use urllib.parse.urlencode()
If you want to make a URL with repetitive params such as: p=1&p=2&p=3 you have two options:
>>> import urllib
>>> a = ...
Switch case with fallthrough?
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314
Use a vertical bar (|) for "or".
case "$C" in
"1")
do_this()
;;
"2" | "3")
do_what...
Python using enumerate inside list comprehension
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167
Try this:
[(i, j) for i, j in enumerate(mylist)]
You need to put i,j inside a tuple for the...
range over interface{} which stores a slice
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137
Well I used reflect.ValueOf and then if it is a slice you can call Len() and Index() on the va...
How to randomly sort (scramble) an array in Ruby?
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Built in now:
[1,2,3,4].shuffle => [2, 1, 3, 4]
[1,2,3,4].shuffle => [1, 3, 2, 4]
share
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improve this answer
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Best way to find the intersection of multiple sets?
... use multiple arguments to set.intersection(), like
u = set.intersection(s1, s2, s3)
If the sets are in a list, this translates to:
u = set.intersection(*setlist)
where *a_list is list expansion
Note that set.intersection is not a static method, but this uses the functional notation to apply ...
Apache Spark: map vs mapPartitions?
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122
What's the difference between an RDD's map and mapPartitions method?
The method map conve...
Accessing last x characters of a string in Bash
...s the positional parameters are used, in which case the indexing
starts at 1 by default. If offset is 0, and the positional parameters are used,
$@ is prefixed to the list.
Since this answer gets a few regular views, let me add a possibility to address John Rix's comment; as he mentions, if your...