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MySQL get the date n days ago as a timestamp
...5:09
mysql> SELECT UNIX_TIMESTAMP(DATE_SUB(NOW(), INTERVAL 30 day));
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Which is the fastest algorithm to find prime numbers?
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edited Jan 17 '09 at 18:49
mmcdole
83.7k6060 gold badges178178 silver badges221221 bronze badges
answe...
Find column whose name contains a specific string
...that match:
import pandas as pd
data = {'spike-2': [1,2,3], 'hey spke': [4,5,6], 'spiked-in': [7,8,9], 'no': [10,11,12]}
df = pd.DataFrame(data)
spike_cols = [col for col in df.columns if 'spike' in col]
print(list(df.columns))
print(spike_cols)
Output:
['hey spke', 'no', 'spike-2', 'spiked-in...
What is the difference between print and puts?
...already.
print does not add a new line.
For example:
puts [[1,2,3], [4,5,nil]] Would return:
1
2
3
4
5
Whereas print [[1,2,3], [4,5,nil]]
would return:
[[1,2,3], [4,5,nil]]
Notice how puts does not output the nil value whereas print does.
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How to remove new line characters from a string?
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answered Nov 10 '10 at 2:34
jasonjason
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How to remove all null elements from a ArrayList or String Array?
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edited May 23 '17 at 12:34
Community♦
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answered Jan 27 '11 at 17:24
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How can I format a nullable DateTime with ToString()?
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346
Console.WriteLine(dt2 != null ? dt2.Value.ToString("yyyy-MM-dd hh:mm:ss") : "n/a");
EDIT: As...
python: how to identify if a variable is an array or a scalar
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14 Answers
14
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Why does this code using random strings print “hello world”?
....Random is constructed with a specific seed parameter (in this case -229985452 or -147909649), it follows the random number generation algorithm beginning with that seed value.
Every Random constructed with the same seed will generate the same pattern of numbers every time.
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print call stack in C or C++
...ion/Darwin/…
– Ben Ylvisaker
Sep 24 '17 at 15:23
On Linux with glibc, unfortunately, backtrace_symbols functions don...