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What's the difference between equal?, eql?, ===, and ==?
...ly useful. Examples of things which have interesting === implementations:
Range
Regex
Proc (in Ruby 1.9)
So you can do things like:
case some_object
when /a regex/
# The regex matches
when 2..4
# some_object is in the range 2..4
when lambda {|x| some_crazy_custom_predicate }
# the lambda ret...
How to fix the datetime2 out-of-range conversion error using DbContext and SetInitializer?
...ng concerns. A null date won't be coerced to a date that isn't within the range of the SQL DateTime type the way a default value would. Another option is to explicitly map to a different type, perhaps with,
.HasColumnType("datetime2")
...
How to detect a Christmas Tree? [closed]
...umber of points does not exceed DBSCAN maximum capacity
Xslice = X[range(0,nsample,int(ceil(float(nsample)/maxpoints)))]
# Translate DBSCAN proximity threshold to units of pixels and run DBSCAN
pixproxthr = proxthresh * sqrt(binimg.shape[0]**2 + binimg.shape[1]**2)
db = DBSCAN(e...
Creating a range of dates in Python
...e.datetime.today()
date_list = [base - datetime.timedelta(days=x) for x in range(numdays)]
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How to generate random number in Bash?
How to generate a random number within a range in Bash?
17 Answers
17
...
Check if a string contains a number
... @confused00 Nope, \d will match only a single digit in the range 0 to 9.
– thefourtheye
Nov 26 '16 at 5:12
10
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Apply multiple functions to multiple groupby columns
... b_mean=('b', 'mean'),
c_sum=('c', 'sum'),
d_range=('d', lambda x: x.max() - x.min())
)
a_sum a_mean b_mean c_sum d_range
group
0 0.947337 0.473668 0.871939 0.838150 0.320543
1 0.6041...
Performance optimization strategies of last resort [closed]
...or repeated calls that contain calculations that have a relatively limited range of inputs, consider making a lookup (array or dictionary) that contains the result of that calculation for all values in the valid range of inputs. Then use a simple lookup inside the algorithm instead.
Down-sides: if f...
Why (0-6) is -6 = False? [duplicate]
...tialization in a block of integer objects we saw above. The small integers range is from -5 to 256. Many Python programs spend a lot of time using integers in that range so this is a smart decision.
This is only an implementation detail of CPython and you shouldn't rely on this. For instance, PyPy...
How to save a Python interactive session?
...ation states:
This function uses the same syntax as %history for input ranges, then saves the lines to the filename you specify.
This allows for example, to reference older sessions, such as
%save current_session ~0/
%save previous_session ~1/
Look at the videos on the presentation page to ...