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How do I revert a Git repository to a previous commit?
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Use RSA private key to generate public key?
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openssl genrsa -out mykey.pem 1024
will actually produce a public - private key pair. The pair is stored in the generated mykey.pem file.
openssl rsa -in mykey.pem -pubout > mykey.pub
will extract the public key and print that out. Here is a link to...
How can I pass a list as a command-line argument with argparse?
...<Required> Set flag', required=True)
# Use like:
# python arg.py -l 1234 2345 3456 4567
nargs='+' takes 1 or more arguments, nargs='*' takes zero or more.
append
parser.add_argument('-l','--list', action='append', help='<Required> Set flag', required=True)
# Use like:
# python arg.py...
What Haskell representation is recommended for 2D, unboxed pixel arrays with millions of pixels?
...exing from regular arrays
chalkboard, Andy Gill's library for manipulating 2D images
codec-image-devil, read and write various image formats to UArray
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What is the recommended batch size for SqlBulkCopy?
...ption. I started with 500 and experimented with larger. I found 5000 to be 2.5x faster, on average, than 500. Inserting the 6 million rows takes about 30 seconds with a batch size of 5,000 and about 80 seconds with batch size of 500.
10,000 was not measurably faster. Moving up to 50,000 improved t...
Python: Get relative path from comparing two absolute paths
...d above can fail:
>>> os.path.commonprefix(['/usr/var', '/usr/var2/log'])
'/usr/var'
even though /usr/var is not a common prefix of the paths. Forcing all paths to end with '/' before calling commonprefix() solves this (specific) problem.
PPPS: as bluenote10 mentioned, adding a slash d...
Delete all files in directory (but not directory) - one liner solution
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edited Apr 17 at 21:15
K.H.
79077 silver badges2323 bronze badges
answered Nov 2 '12 at 13:10
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CSS styling in Django forms
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Taken from my answer to:
How to markup form fields with <div class='field_type'> in Djan...
diff to output only the file names
...ely compare any subdirectories found.
Example command:
diff -qr dir1 dir2
Example output (depends on locale):
$ ls dir1 dir2
dir1:
same-file different only-1
dir2:
same-file different only-2
$ diff -qr dir1 dir2
Files dir1/different and dir2/different differ
Only in dir1: only-1
Only in d...
String.format() to format double in java
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String.format("%1$,.2f", myDouble);
String.format automatically uses the default locale.
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