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Call by name vs call by value in Scala, clarification needed
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545
The example you have given only uses call-by-value, so I will give a new, simpler, example that...
“Could not run curl-config: [Errno 2] No such file or directory” when installing pycurl
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488
On Debian I needed the following packages to fix this
sudo apt install libcurl4-openssl-dev l...
How to solve error “Missing `secret_key_base` for 'production' environment” (Rails 4.1)
I created a Rails application, using Rails 4.1, from scratch and I am facing a strange problem that I am not able to solve.
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How can I read inputs as numbers?
...gt;>> import sys
>>> sys.version
'2.7.6 (default, Mar 22 2014, 22:59:56) \n[GCC 4.8.2]'
>>> data = input("Enter a number: ")
Enter a number: 5 + 17
>>> data, type(data)
(22, <type 'int'>)
The data 5 + 17 is evaluated and the result is 22. When it evaluates th...
How to throw std::exceptions with variable messages?
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49
Here is my solution:
#include <stdexcept>
#include <sstream>
class Formatter
{
pu...
Add Text on Image using PIL
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edited Jul 25 '17 at 11:54
chro
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answered May 4 '...
JetBrains / IntelliJ keyboard shortcut to collapse all methods
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441
You may take a look at intellij code folding shortcuts.
For Windows/Linux do: Ctrl+Shift+-
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How do you detect Credit card type based on number?
...ar expression like the ones below: Credit for original expressions
Visa: ^4[0-9]{6,}$ Visa card numbers start with a 4.
MasterCard: ^5[1-5][0-9]{5,}|222[1-9][0-9]{3,}|22[3-9][0-9]{4,}|2[3-6][0-9]{5,}|27[01][0-9]{4,}|2720[0-9]{3,}$ Before 2016, MasterCard numbers start with the numbers 51 through 5...
How to align absolutely positioned element to center?
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224
If you set both left and right to zero, and left and right margins to auto you can center an abs...
How to sort two lists (which reference each other) in the exact same way
...ly simple using python's built-in zip function:
>>> list1 = [3,2,4,1, 1]
>>> list2 = ['three', 'two', 'four', 'one', 'one2']
>>> list1, list2 = zip(*sorted(zip(list1, list2)))
>>> list1
(1, 1, 2, 3, 4)
>>> list2
('one', 'one2', 'two', 'three', 'four')
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