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When saving, how can you check if a field has changed?
... if you make changes to the object, save it, then makes additional changes and call save() on it AGAIN, it will still work correctly.
– philfreo
Mar 14 '12 at 22:57
17
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Import existing source code to GitHub
...itbucket/github, then push up your source)
Create the remote repository, and get the URL such as git@github.com:/youruser/somename.git or https://github.com/youruser/somename.git
If your local GIT repo is already set up, skips steps 2 and 3
Locally, at the root directory of your source, git ini...
How to remove old Docker containers
...r prune:
docker container prune
This will remove all stopped containers and should work on all platforms the same way.
There is also a Docker system prune:
docker system prune
which will clean up all unused containers, networks, images (both dangling and unreferenced), and optionally, volumes...
Pretty-print a Map in Java
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This does not handle arrays as map's values (eg. Map<String, String[]>). Only their className and hash is printed instead of actual values.
– Petr Újezdský
Oct 19 '16 at 8:49
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What is the Windows version of cron? [closed]
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For the original question, asking about Windows XP (and Windows 7): Windows Task Scheduler
For command-line usage, you can schedule with the AT command.
For newer Microsoft OS versions, Windows Server 2012 / Windows 8, look at the schtasks command line utility.
If using Powe...
How can I find unused images and CSS styles in a website? [closed]
Is there a method (other than trial and error) I can use to find unused image files? How about CSS declarations for ID's and Classes that don't even exist in the site?
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Efficient evaluation of a function at every cell of a NumPy array
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You could just vectorize the function and then apply it directly to a Numpy array each time you need it:
import numpy as np
def f(x):
return x * x + 3 * x - 2 if x > 0 else x * 5 + 8
f = np.vectorize(f) # or use a different name if you want to keep the...
How to replace multiple substrings of a string?
...t;>> pattern.sub(lambda m: rep[re.escape(m.group(0))], "(condition1) and --condition2--")
'() and --text--'
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php var_dump() vs print_r()
What is the difference between var_dump() and print_r() in terms of spitting out an array as string?
12 Answers
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What's the regular expression that matches a square bracket?
...May 29 '09 at 20:51
Peter StuifzandPeter Stuifzand
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