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Join a list of items with different types as string in Python
..., i.e.
>>> x = ['1', '2']
>>> x.extend([str(i) for i in range(3, 6)])
>>> x
['1', '2', '3', '4', '5']
All of this is considered pythonic (ok, a generator expression is even more pythonic but let's stay simple and on topic)
...
Count the number occurrences of a character in a string
...)
Return the number of non-overlapping occurrences of substring sub in the range [start, end]. Optional arguments start and end are interpreted as in slice notation.
>>> sentence = 'Mary had a little lamb'
>>> sentence.count('a')
4
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Initialising an array of fixed size in python [duplicate]
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Do this:
>>> d = [ [ None for y in range( 2 ) ] for x in range( 2 ) ]
>>> d
[[None, None], [None, None]]
>>> d[0][0] = 1
>>> d
[[1, None], [None, None]]
The other solutions will lead to this kind of problem:
>>> d = [ [ N...
How to have git log show filenames like svn log -v
...command is essentially the same as
git-log[1] but defaults to show
the raw format diff output and to skip merges.
The command is kept primarily for historical reasons; fingers of many
people who learned Git long before git log was invented by reading
Linux kernel mailing list are traine...
How to install a previous exact version of a NPM package?
...ion, an exact version will be installed. If you specify a semantic version range, then you might get a non-exact match. There's nothing unique about the install command in that respect.
– Bret Copeland
Jun 20 '15 at 18:49
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NSPredicate: filtering objects by day of NSDate property
... NSDate is a date-and-time -- you might want to use a midnight-to-midnight range.
– jlstrecker
Oct 17 '11 at 15:45
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Skip first entry in for loop in python?
...will run through the iterator. Try doing something like collections.deque(xrange(10000000)). There's no need to store all the ints in memory if you want to skip the first item...
– Roee Shenberg
Dec 4 '12 at 11:04
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Is it correct to use JavaScript Array.sort() method for shuffling?
...perfect" distribution if rand(x) is guaranteed to be exactly even over its range. Given that there are usually 2^x possible states for the RNG for some x, I don't think it'll be exactly even for rand(3).
– Jon Skeet
Jun 8 '09 at 5:28
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Selecting a row of pandas series/dataframe by integer index
...imagine this scenario
In [1]: df = pd.DataFrame(np.random.rand(5,2),index=range(0,10,2),columns=list('AB'))
In [2]: df
Out[2]:
A B
0 1.068932 -0.794307
2 -0.470056 1.192211
4 -0.284561 0.756029
6 1.037563 -0.267820
8 -0.538478 -0.800654
In [5]: df.iloc[[2]]
Out[5]:
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Sort NSArray of date strings or objects
... problem to make/do. Preferably, I recommend also storing the data in it's raw format. Makes it easier to manipulate in situations like this.
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