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How to fix “Headers already sent” error in PHP
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Unintentional:
Whitespace before <?php or after ?>
The UTF-8 Byte Order Mark specifically
Previous error messages or notices
Intentional:
print, echo and other functions producing output
Raw <html> sections prior <?php code.
Why does it happen?
To understand why header...
Get the Row(s) which have the max count in groups using groupby
...s) I found it to be very slow. Here is an alternative that I found to run orders of magnitude faster on my data set.
df = pd.DataFrame({
'sp' : ['MM1', 'MM1', 'MM1', 'MM2', 'MM2', 'MM2', 'MM4', 'MM4', 'MM4'],
'mt' : ['S1', 'S1', 'S3', 'S3', 'S4', 'S4', 'S2', 'S2', 'S2'],
'val' : ['a', ...
How to detect a Christmas Tree? [closed]
... is either less than 0.2 on a 0.0-1.0 scale (corresponding roughly to the border between yellow and green) or greater than 0.95 (corresponding to the border between purple and red) and additionally I require bright, saturated colors: saturation and value must both be above 0.7. The results of the t...
How do you enable “Enable .NET Framework source stepping”?
....dll independent of the other dlls that should get rolled back with it (in order for it to work properly). Furthermore, temporary updating the GAC with old dlls would essentially be equivalent to temporarily uninstalling the security update.
– Matt Smith
Sep 2...
MVC pattern on Android
...code.
This is particularly useful when you use Mono to share the model in order to develop cross-platform applications.
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Bootstrap Dropdown menu is not working
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I realized that the order of those code lines is also important. If you put google apis as last line of code, then it does not work.
– Efe Büyük
May 9 '17 at 16:16
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Get last n lines of a file, similar to tail
... block_number = -1
blocks = [] # blocks of size BLOCK_SIZE, in reverse order starting
# from the end of the file
while lines_to_go > 0 and block_end_byte > 0:
if (block_end_byte - BLOCK_SIZE > 0):
# read the last block we haven't yet read
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How to wait for all threads to finish, using ExecutorService?
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I can't believe that you have to use shutdown in order to join on all the current threads (after using shutdown, you cannot use the executor again ever). Suggest using list of Future's instead...
– rogerdpack
Nov 2 '12 at 16:02
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Non greedy (reluctant) regex matching in sed?
...ell) which means it goes with . until a match is found for ([0-9]+).*. But order is important too.
Since global flag is set, engine tries to continue matching character by character up to the end of input string or our target. As soon as the first and only capturing group of left side of alterna...
How to get first element in a list of tuples?
...tually a list of sets, then there is no first element because sets have no order.
Here I've created a flat list because generally that seems more useful than creating a list of 1 element tuples. However, you can easily create a list of 1 element tuples by just replacing seq[0] with (seq[0],).
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