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Determine the number of lines within a text file
...ore efficient was regarding memory usage, not necessarily speed. The first one loads the entire contents of the file into an array which means it must allocate at least as much memory as the size of the file. The second merely loops one line at a time so it never has to allocate more than one line's...
How do I have an enum bound combobox with custom string formatting for enum values?
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Nice one. Better overal, but might be overkill for your run-of-the-mill never-will-be-globalized-in-any-way piece of software. (I know, that assumption will turn out to be false later. ;-))
– peSHIr
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Detect and exclude outliers in Pandas data frame
...dataframe and would like to remove all rows that have outliers in at least one column, the following expression would do that in one shot.
df = pd.DataFrame(np.random.randn(100, 3))
from scipy import stats
df[(np.abs(stats.zscore(df)) < 3).all(axis=1)]
description:
For each column, first it...
Creating a new dictionary in Python
... Is there any difference between dict() and {}? Or do people just prefer one over the other?
– Matt
Mar 2 '12 at 17:13
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How to drop columns by name in a data frame
...d this option to avoid the conversion to an atomic vector if there is only one column left
Second, quicker to write, you can directly assign NULL to the columns you want to remove:
data[c("iden", "name", "x_serv", "m_serv")] <- list(NULL) # You need list() to respect the target structure.
Fi...
MySQL INSERT INTO table VALUES.. vs INSERT INTO table SET
... @Pacerier Such as? The only problem I see is a portability one (which, in many contexts doesn't really matter); am I missing something?
– Mark Amery
Jan 29 '13 at 13:56
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How to get unique device hardware id in Android? [duplicate]
...he unique device ID in Android which cannot be changed when performing a phone reset or OS update?
3 Answers
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Why are Python lambdas useful? [closed]
I'm trying to figure out Python lambdas. Is lambda one of those "interesting" language items that in real life should be forgotten?
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Can I change the fill color of an svg path with CSS?
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@RicardoZea One caveat to that: you can include an object from an external SVG file with <use href="external.svg#objId" /> and your local CSS will still apply to some degree.
– Ken Bellows
Oct...
How do I merge two dictionaries in a single expression in Python (taking union of dictionaries)?
...es
z.update(y) # modifies z with y's keys and values & returns None
return z
and now:
z = merge_two_dicts(x, y)
In Python 3.9.0a4 or greater (final release date approx October 2020): PEP-584, discussed here, was implemented to further simplify this:
z = x | y # NOTE: 3.9+ ...