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Are there pronounceable names for common Haskell operators? [closed]
...s " " [whitespace])
. pipe to a . b: "b pipe-to a"
!! index
! index / strict a ! b: "a index b", foo !x: foo strict x
<|> or / alternative expr <|> term: "expr or term"
++ concat / plus / append
[] empty list
: cons
:: of type / as ...
How to split/partition a dataset into training and test datasets for, e.g., cross validation?
...ation import StratifiedKFold
skf = StratifiedKFold(y, n_folds=5)
for train_index, test_index in skf:
print("TRAIN:", train_index, "TEST:", test_index)
X_train, X_test = X[train_index], X[test_index]
y_train, y_test = y[train_index], y[test_index]
...
Renaming columns in pandas
... don't do that. Looks like that's a list generated independent of whatever indexing stores the column name. Does a nice job destroying column naming for your df...
– Mitch Flax
Mar 11 '14 at 18:42
...
How to estimate how much memory a Pandas' DataFrame will need?
...6600
Calendar_Year 20906600
Model_Year 20906600
...
To include indexes, pass index=True.
So to get overall memory consumption:
>>> df.memory_usage(index=True).sum()
731731000
Also, passing deep=True will enable a more accurate memory usage report, that accounts for the full usa...
Using git repository as a database backend
... reason for me not doing this is query capabilities. Document stores often index documents, making it easy to search within them. This will not be straight forward with git.
– FrankyHollywood
Nov 9 '17 at 19:08
...
How do I pass an extra parameter to the callback function in Javascript .filter() method?
...ith(wordToCompare) {
return function(element) {
return element.indexOf(wordToCompare) === 0;
}
}
addressBook.filter(startsWith(wordToCompare));
Another option would be to use Function.prototype.bind [MDN] (only available in browser supporting ECMAScript 5, follow a link for a shim...
The best way to remove duplicate values from NSMutableArray in Objective-C?
... over a copy of the array:
NSArray *copy = [mutableArray copy];
NSInteger index = [copy count] - 1;
for (id object in [copy reverseObjectEnumerator]) {
if ([mutableArray indexOfObject:object inRange:NSMakeRange(0, index)] != NSNotFound) {
[mutableArray removeObjectAtIndex:index];
}
...
What is the best way to tell if a character is a letter or number in Java without using regexes?
What is the best and/or easiest way to recognize if a string.charAt(index) is an A-z letter or a number in Java without using regular expressions? Thanks.
...
Foreach loop, determine which is the last iteration of the loop
...ch:
foreach (Item result in Model.Results)
{
if (Model.Results.IndexOf(result) == Model.Results.Count - 1) {
// this is the last item
}
}
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...
Iterating each character in a string using Python
...
If you need access to the index as you iterate through the string, use enumerate():
>>> for i, c in enumerate('test'):
... print i, c
...
0 t
1 e
2 s
3 t
share...