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Mapping over values in a python dictionary
Given a dictionary { k1: v1, k2: v2 ... } I want to get { k1: f(v1), k2: f(v2) ... } provided I pass a function f .
7 ...
Python group by
... 2 steps. First, create a dictionary.
>>> input = [('11013331', 'KAT'), ('9085267', 'NOT'), ('5238761', 'ETH'), ('5349618', 'ETH'), ('11788544', 'NOT'), ('962142', 'ETH'), ('7795297', 'ETH'), ('7341464', 'ETH'), ('9843236', 'KAT'), ('5594916', 'ETH'), ('1550003', 'ETH')]
>>> from ...
How does the HyperLogLog algorithm work?
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The main trick behind this algorithm is that if you, observing a stream of random integers, see an integer which binary representation starts with some known prefix, there is a higher chance that the cardinality of the stream is 2^(size o...
Return first N key:value pairs from dict
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There's no such thing a the "first n" keys because a dict doesn't remember which keys were inserted first.
You can get any n key-value pairs though:
n_items = take(n, d.iteritems())
This uses the implementation of take from the itertools recipes:
from iterto...
Show diff between commits
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Try
git diff k73ud^..dj374
to make sure to include all changes of k73ud in the resulting diff.
git diff compares two endpoints (instead of a commit range).
Since the OP want to see the changes introduced by k73ud, he/she needs to diffe...
Best way to convert strings to symbols in hash
What's the (fastest/cleanest/straightforward) way to convert all keys in a hash from strings to symbols in Ruby?
31 Answers...
How can you set class attributes from variable arguments (kwargs) in python
Suppose I have a class with a constructor (or other function) that takes a variable number of arguments and then sets them as class attributes conditionally.
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month name to month number and vice versa in python
...reate a reverse dictionary using the calendar module:
import calendar
{v: k for k,v in enumerate(calendar.month_abbr)}
Before Python (2.7+) you would do
dict((v,k) for k,v in enumerate(calendar.month_abbr))
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HTML+CSS: How to force div contents to stay in one line?
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Try this:
div {
border: 1px solid black;
width: 70px;
overflow: hidden;
white-space: nowrap;
}
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How do I see all foreign keys to a table or column?
In MySQL, how do I get a list of all foreign key constraints pointing to a particular table? a particular column? This is the same thing as this Oracle question , but for MySQL.
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