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What does enumerate() mean?
What does for row_number, row in enumerate(cursor): do in Python?
5 Answers
5
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How to find all serial devices (ttyS, ttyUSB, ..) on Linux without opening them?
...lugged my (FTDI) serial device from the USB and afterwards it produced the error that you described.
– Warpspace
Jan 29 '19 at 8:30
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iPad keyboard will not dismiss if modal ViewController presentation style is UIModalPresentationForm
... UIViewController and call it when you want the keyboard gone:
@interface _TempUIVC : UIViewController
@end
@implementation _TempUIVC
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
return YES;
}
@end
@implementation UIViewController (Helpers)
- ...
How to pick just one item from a generator?
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answered Feb 22 at 10:05
Dave RoveDave Rove
53044 silver badges99 bronze badges
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What's the fastest way to loop through an array in JavaScript?
...e better performance, writing code that is less legible and more prone to errors than a simple straightforward for loop. Therefore, I recommend:
If your app iterates over a lot of items or your loop code is inside a function that is used often, a straightforward for loop is the answer:
for (var ...
List of lists changes reflected across sublists unexpectedly
...at you create a new list at each position. One way to do it is
[[1]*4 for _ in range(3)]
which will reevaluate [1]*4 each time instead of evaluating it once and making 3 references to 1 list.
You might wonder why * can't make independent objects the way the list comprehension does. That's beca...
Save Screen (program) output to a file
..., a screen run overnight with a config file created and deleted on the fly errored out on a screen -r with "Unable to open "/tmp/log.conf". Also, the screen went from [detached] state to non-existent. What could have been the problem?
– Ram RS
Oct 13 '16 at 14:...
Find the nth occurrence of substring in a string
... more Pythonic version of the straightforward iterative solution:
def find_nth(haystack, needle, n):
start = haystack.find(needle)
while start >= 0 and n > 1:
start = haystack.find(needle, start+len(needle))
n -= 1
return start
Example:
>>> find_nth("fo...
Is there a bash command which counts files?
...gt;/dev/null redirects stderr so that if there are 0 log files, ignore the error message. (Note that shopt -s nullglob would cause ls to list the entire working directory instead.)
wc -l consumes the directory listing as it's being generated, so the output of ls is never in memory at any point in ti...
How can I find the version of the Fedora I use?
...s... :-(
– BRPocock
Dec 2 '11 at 16:05
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That's a wrong answer. The answer of @BruceONeel should ...