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How to iterate through two lists in parallel?
...hese investigations is given below. The sizes of the foo and bar lists had ranged from 10 to 1,000,000 elements.
Results:
For printing purposes: The performances of all the considered approaches were observed to be approximately similar to the zip() function, after factoring an accuracy tolerance o...
How can I get list of values from dict?
...ker?
[*L] vs. [].extend(L) vs. list(L)
small_ds = {x: str(x+42) for x in range(10)}
small_df = {x: float(x+42) for x in range(10)}
print('Small Dict(str)')
%timeit [*small_ds.values()]
%timeit [].extend(small_ds.values())
%timeit list(small_ds.values())
print('Small Dict(float)')
%timeit [*small...
Finding differences between elements of a list
...lution:
>>> t = [1, 3, 6]
>>> v = [t[i+1]-t[i] for i in range(len(t)-1)]
>>> v
[2, 3]
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Access multiple elements of list knowing their index
...hList, ind: [searchList[i] for i in ind]
using the following input:
a = range(0, 10000000)
b = range(500, 500000)
simple python loop was the quickest with lambda operation a close second, mapIndexValues and getIndexValues were consistently pretty similar with numpy method significantly slower a...
How to make good reproducible pandas examples
... this is similar to r's expand.grid(), see note 2 below
'd':np.repeat( range(3), 2 ),
'e':np.tile( range(2), 3 ),
# a date range and set of random dates
'f':pd.date_range('1/1/2011', periods=6, freq='D'),
'g':np.random.choice( pd.date_range('1/1/2011', periods=365,
...
Convert a list to a dictionary in Python
...mprehension, but ironically I think the simplest way to do it will be with range() and len(), which would normally be a code smell.
b = {a[i]: a[i+1] for i in range(0, len(a), 2)}
So the iter()/izip() method is still probably the most Pythonic in Python 3, although as EOL notes in a comment, zip(...
How Do I Convert an Integer to a String in Excel VBA?
...e compounding with another String variable or constant. Like this:
Sheet1.Range("A1").Value = "My favorite number is " & 7
"My favorite number is 7"
So, really, the only rare case is when you really want to store an integer value, into a variant or Cell value, when not also compounding w...
Rolling or sliding window iterator?
...ow(seq, n=2):
it = iter(seq)
win = deque((next(it, None) for _ in xrange(n)), maxlen=n)
yield win
append = win.append
for e in it:
append(e)
yield win
In my tests it handily beats everything else posted here most of the time, though pillmuncher's tee version bea...
Encode html entities in javascript
...
You can use regex to replace any character in a given unicode range with its html entity equivalent. The code would look something like this:
var encodedStr = rawStr.replace(/[\u00A0-\u9999<>\&]/gim, function(i) {
return '&#'+i.charCodeAt(0)+';';
});
This code will r...
Crontab Day of the Week syntax
...l
Having two numbers 0 and 7 for Sunday can be useful for writing weekday ranges starting with 0 or ending with 7. So you can write ranges starting with Sunday or ending with it, like 0-2 or 5-7 for example (ranges must start with the lower number and must end with the higher). The abbreviations ca...