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Most efficient way of making an if-elif-elif-else statement when the else is done the most?
...':
the_thing = 1
elif something == 'that':
the_thing = 2
elif something == 'there':
the_thing = 3
else:
the_thing = 4
2.py
something = 'something'
options = {'this': 1, 'that': 2, 'there': 3}
for i in xrange(1000000):
the_thing = options.get(someth...
Getting the count of unique values in a column in bash
... see a frequency count for column two (for example):
awk -F '\t' '{print $2}' * | sort | uniq -c | sort -nr
fileA.txt
z z a
a b c
w d e
fileB.txt
t r e
z d a
a g c
fileC.txt
z r a
v d c
a m c
Result:
3 d
2 r
1 z
1 m
1 g
1...
python assert with and without parenthesis
...s optional, you've essentially called assert True when you wrote assert(1==2, "hi").
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pandas read_csv and filter columns with usecols
...pandas as pd
from StringIO import StringIO
csv = r"""dummy,date,loc,x
bar,20090101,a,1
bar,20090102,a,3
bar,20090103,a,5
bar,20090101,b,1
bar,20090102,b,3
bar,20090103,b,5"""
df = pd.read_csv(StringIO(csv),
header=0,
index_col=["date", "loc"],
usecols=["date", "loc", "x"],...
How do I find the most recent git commit that modified a file?
...
237
git log supports looking at the history of specific files (and directories), so you can call i...
Difference between del, remove and pop on lists
...
1423
The effects of the three different methods to remove an element from a list:
remove removes the...
What is the maximum number of characters that nvarchar(MAX) will hold?
...
Max. capacity is 2 gigabytes of space - so you're looking at just over 1 billion 2-byte characters that will fit into a NVARCHAR(MAX) field.
Using the other answer's more detailed numbers, you should be able to store
(2 ^ 31 - 1 - 2) / 2 = ...
Get Unix Epoch Time in Swift
...
162
You can simply use NSDate's timeIntervalSince1970 function.
let timeInterval = NSDate().timeIn...
How can I extract a good quality JPEG image from a video file with ffmpeg?
...
2 Answers
2
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...
Why is a round-trip conversion via a string not safe for a double?
... *dst = 0;
}
}
It turns out that _ecvt returns the string 845512408225570.
Notice the trailing zero? It turns out that makes all the difference!
When the zero is present, the result actually parses back to 0.84551240822557006, which is your original number -- so it compares equal, and h...