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Is git's semi-secret empty tree object reliable, and why is there not a symbolic name for it?
...comments:
printf '' | git hash-object --stdin -t tree
Or, as seen here, from Colin Schimmelfing:
git hash-object -t tree --stdin < /dev/null
So I guess it is safer to define a variable with the result of that command as your empty sha1 tree (instead of relying of a "well known value").
Not...
Draw in Canvas by finger, Android
...or you just get duplicates
// almost always you will want to reduce res from the very high screen res
whatTheUserDrewBitmap =
ThumbnailUtils.extractThumbnail(whatTheUserDrewBitmap, 256, 256);
// NOTE that's an incredibly useful trick for cropping/resizing squares
// while handling ...
How to create ENUM type in SQLite?
I need to convert a table from MySQL to SQLite, but I can't figure out how to convert an enum field, because I can't find ENUM type in SQLite.
...
How do I negate a test with regular expressions in a bash script?
...have not seen enough bash scripting examples to feel comfortable deviating from (my understanding of) the cookbook.
– David Rogers
Dec 28 '10 at 16:33
4
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Addition for BigDecimal
...
It looks like from the Java docs here that add returns a new BigDecimal:
BigDecimal test = new BigDecimal(0);
System.out.println(test);
test = test.add(new BigDecimal(30));
System.out.println(test);
test = test.add(new BigDecimal(45));
Sy...
How to add NERDTree to your .vimrc
...get NERDTree to load automatically when you start up vim, run it like this from the command line:
$ vim -c "NERDTree" some_file.txt
You can set an alias for this in your .bashrc:
alias vimt='vim -c "NERDTree" $1'
Now whenever you run vimt (instead of vim) you'll also open up NERDTree on the le...
What is the second parameter of NSLocalizedString()?
... the translation, that is you are giving a key to get corresponding string from the corresponding strings file.
The comment parameter enables developer to understand what the key represents...
share
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How to retrieve inserted id after inserting row in SQLite using Python?
... The last_insert_rowid() function returns the ROWID of the last row insert from the database connection which invoked the function. The last_insert_rowid() SQL function is a wrapper around the sqlite3_last_insert_rowid() C/C++ interface function.
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Custom numeric format string to always display the sign
...also use format strings in string.Format(); the format string is separated from the index with a colon (':')
var f = string.Format("{0}, Force sign {0:+#;-#;+0}, No sign for zero {0:+#;-#;0}", number);
For number { +1, -1, 0 } this gives:
1, Force sign +1, No sign for zero +1
-1, Force ...
Convert list to tuple in Python
... do:
t = *l, # or t = (*l,)
short, a bit faster but probably suffers from readability.
This essentially unpacks the list l inside a tuple literal which is created due to the presence of the single comma ,.
P.s: The error you are receiving is due to masking of the name tuple i.e you assign...