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Modify table: How to change 'Allow Nulls' attribute from not null to allow null
...NULL column to allow null values, except for columns in PRIMARY KEY constraints.
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Convert a String representation of a Dictionary to a dictionary?
How can I convert the str representation of a dict , such as the following string, into a dict ?
9 Answers
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How can I save an image with PIL?
...port sys
import numpy
from PIL import Image
img = Image.open(sys.argv[1]).convert('L')
im = numpy.array(img)
fft_mag = numpy.abs(numpy.fft.fftshift(numpy.fft.fft2(im)))
visual = numpy.log(fft_mag)
visual = (visual - visual.min()) / (visual.max() - visual.min())
result = Image.fromarray((visual *...
dd: How to calculate optimal blocksize? [closed]
...optimal block size:
#include <sys/stat.h>
#include <stdio.h>
int main(void)
{
struct stat stats;
if (!stat("/", &stats))
{
printf("%u\n", stats.st_blksize);
}
}
The best way may be to experiment: copy a gigabyte with various block sizes and time that. (Re...
Importing a CSV file into a sqlite3 database table using Python
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I keep getting not all arguments converted during string formatting when I attempt this method.
– Whitecat
Sep 1 '16 at 23:27
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How to change collation of database, table, column?
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You need to either convert each table individually:
ALTER TABLE mytable CONVERT TO CHARACTER SET utf8mb4
(this will convert the columns just as well), or export the database with latin1 and import it back with utf8mb4.
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Finding current executable's path without /proc/self/exe
...se, you probably want the client context so canonicalization is ok. Also convert patterns like "/./" to "/" and "//" to "/".
In shell, readlink --canonicalize will resolve multiple symlinks and canonicalize name. Chase may do similar but isn't installed. realpath() or canonicalize_file_name(...
Writing Unicode text to a text file?
... the way out.
If your string is actually a unicode object, you'll need to convert it to a unicode-encoded string object before writing it to a file:
foo = u'Δ, Й, ק, م, ๗, あ, 叶, 葉, and 말.'
f = open('test', 'w')
f.write(foo.encode('utf8'))
f.close()
When you read that file again...
Find the files existing in one directory but not in the other [closed]
...that does exactly what I wanted: Verify a bulk copy: +1 from me. (neeed to convert to python2 though) Hint: use of sets might make the diff part simpler.
– Jason Morgan
Suppress/ print without b' prefix for bytes in Python 3
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If the data is in an UTF-8 compatible format, you can convert the bytes to a string.
>>> import curses
>>> print(str(curses.version, "utf-8"))
2.2
Optionally convert to hex first, if the data is not already UTF-8 compatible. E.g. when the data are actual raw...