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Returning value from called function in a shell script
...r"
testlock(){
retval=""
if mkdir "$lockdir"
then # Directory did not exist, but it was created successfully
echo >&2 "successfully acquired lock: $lockdir"
retval="true"
else
echo >&2 "cannot acquire lock, giving up on $lockdir"
retv...
How to skip “Loose Object” popup when running 'git gui'
... from anyway? The output of git-fsck, perhaps?
– David Dombrowsky
Oct 7 '09 at 14:57
thanks - i also had loose object...
Change a column type from Date to DateTime during ROR migration
... This answer is only partially correct, you can not use change_column inside change even on rails 4 or down migration will not work. You should use up/down no matter the version of rails.
– Alan Peabody
Jul 18 '14 at 18:31
...
How do I validate a date string format in python?
...
>>> import datetime
>>> def validate(date_text):
try:
datetime.datetime.strptime(date_text, '%Y-%m-%d')
except ValueError:
raise ValueError("Incorrect data format, should be YYYY-MM-DD")
>>> validate('2003-12-23')
>>...
How do I handle the window close event in Tkinter?
...u can use the protocol method to install a handler for this protocol (the widget must be a Tk or Toplevel widget):
Here you have a concrete example:
import tkinter as tk
from tkinter import messagebox
root = tk.Tk()
def on_closing():
if messagebox.askokcancel("Quit", "Do you want to quit?"):...
What kind of Garbage Collection does Go use?
...
Plans for Go 1.4+ garbage collector:
hybrid stop-the-world/concurrent collector
stop-the-world part limited by a 10ms deadline
CPU cores dedicated to running the concurrent collector
tri-color mark-and-sweep algorithm
non-generational
non-compacting
fully precise
in...
Why use Object.prototype.hasOwnProperty.call(myObj, prop) instead of myObj.hasOwnProperty(prop)?
...ct.prototype.hasOwnProperty).
But it's less likely someone will have overridden the Object.prototype.hasOwnProperty reference.
And since we are at it, why do we define this function at all?
See above.
Is it
just a question of shortcuts and local caching of property access for
(slight...
How can I set the Secure flag on an ASP.NET Session Cookie?
... which only transmit all cookies including session in SSL only and also inside forms authentication, but if you turn on SSL on httpcookies you must also turn it on inside forms configuration too.
Edit for clarity:
Put this in <system.web>
<httpCookies requireSSL="true" />
...
Difference between git checkout --track origin/branch and git checkout -b branch origin/branch
...ent name.
(That is, as commented by Sebastian Graf, if the local branch did not exist already.
If it did, you would need git checkout -B abranch origin/abranch)
Note: with Git 2.23 (Q3 2019), that would use the new command git switch:
git switch -c <branch> --track <remote>/<bra...
What is the optimal Jewish toenail cutting algorithm?
...e only 5! = 120 unrestricted sequences.
Python example:
#seq is only valid when consecutive elements in the list differ by at least two.
def isValid(seq):
for i in range(len(seq)-1):
a = seq[i]
b = seq[i+1]
if abs(a-b) == 1:
return False
return True
f...