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How to use OpenSSL to encrypt/decrypt files?
...ypically used when the encrypted output is to be transmitted in ASCII/text form and has the effect of increasing output size compared binary form. The original poster does not specify output format and so I feel that at the very least this should be mentioned. See answer: stackoverflow.com/a/3155282...
Transpose a data frame
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Thanks for contributing an answer to Stack Overflow!Please be sure to answer the question. Provide details and share your research!But avoid …Asking for help, clarification, or responding to other answers.Making statements based o...
Keep only first n characters in a string?
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You are looking for JavaScript's String method substring
e.g.
'Hiya how are you'.substring(0,8);
Which returns the string starting at the first character and finishing before the 9th character - i.e. 'Hiya how'.
substring documentation
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Testing if jQueryUI has loaded
...ometimes loads in time, sometimes not. If ui is not loaded, how can I wait for it (or force it to be loaded) before calling any method?
– Gabriel Diaconescu
Sep 14 '11 at 10:10
17
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RSpec: how to test if a method was called?
...n order to ensure that a method was called during the execution of a test (for the sake of argument, let's just say I can't really interrogate the state of the object after the call because the operation the method performs is not easy to see the effect of).
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Replace None with NaN in pandas dataframe
...bject None, not the string 'None'.
import pandas as pd
import numpy as np
For dataframe:
df = df.fillna(value=np.nan)
For column or series:
df.mycol.fillna(value=np.nan, inplace=True)
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imp...
function declaration isn't a prototype
...ol that might be present in a different translation unit (C compiler speak for source file), don't resolve it until link time. On the other hand, symbols which are function names are anyway resolved at link time. The meaning of a storage class specifier on a function (extern, static) only affects it...
How to create a new branch from a tag?
...to pom / release versions
Stage changes
git commit -m "Update pom versions for Hotfix branch"
Finally push your newly created branch to remote repository.
git push -u origin NewBranchName
I hope this would help.
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How do you programmatically set an attribute?
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setattr(x, attr, 'magic')
For help on it:
>>> help(setattr)
Help on built-in function setattr in module __builtin__:
setattr(...)
setattr(object, name, value)
Set a named attribute on an object; setattr(x, 'y', v) is equivalent to
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Is optimisation level -O3 dangerous in g++?
... a personal note, I am running production software in the financial sector for many years now with -O3 and have not yet encountered a bug that would not have been there if I would have used -O2.
By popular demand, here an addition:
-O3 and especially additional flags like -funroll-loops (not enabl...