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How to compare two dates?
...rt datetime, timedelta
>>> past = datetime.now() - timedelta(days=1)
>>> present = datetime.now()
>>> past < present
True
>>> datetime(3000, 1, 1) < present
False
>>> present - datetime(2000, 4, 4)
datetime.timedelta(4242, 75703, 762105)
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Is there a better way to iterate over two lists, getting one element from each list for each iterati
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answered Dec 17 '09 at 2:03
Roberto BonvalletRoberto Bonvallet
25.9k55 gold badges3737 silver badges5555 bronze badges
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how does multiplication differ for NumPy Matrix vs Array classes?
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127
The main reason to avoid using the matrix class is that a) it's inherently 2-dimensional, and ...
awk without printing newline
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awk '{sum+=$3}; END {printf "%f",sum/NR}' ${file}_${f}_v1.xls >> to-plot-p.xls
print will insert a newline by default. You dont want that to happen, hence use printf instead.
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comparing 2 strings alphabetically for sorting purposes
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124
Lets look at some test cases - try running the following expressions in your JS console:
"a" ...
How to sort a dataFrame in python pandas by two or more columns?
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As of the 0.17.0 release, the sort method was deprecated in favor of sort_values. sort was completely removed in the 0.20.0 release. The arguments (and results) remain the same:
df.sort_values(['a', 'b'], ascending=[True, False])
Y...
What do you call the -> operator in Ruby?
... lambda defined using -> is called lambda literal.
succ = ->(x){ x+1 }
succ.call(2)
The code is equivalent to the following one.
succ = lambda { |x| x + 1 }
succ.call(2)
Informally, I have heard it being called stabby lambda or stabby literal.
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How do you detect Credit card type based on number?
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781
+50
The credi...
Looping over a list in Python
...n mylist[:] and your len(x) should be equal to 3.
>>> mylist = [[1,2,3],[4,5,6,7],[8,9,10]]
>>> for x in mylist:
... if len(x)==3:
... print x
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[1, 2, 3]
[8, 9, 10]
or if you need more pythonic use list-comprehensions
>>> [x for x in mylist if len(x)==3...
Maven: how to override the dependency added by a library
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103
Simply specify the version in your current pom. The version specified here will override other...