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How can I get list of values from dict?
...
You can use * operator to unpack dict_values:
>>> d = {1: "a", 2: "b"}
>>> [*d.values()]
['a', 'b']
or list object
>>> d = {1: "a", 2: "b"}
>>> list(d.values())
['a', 'b']
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C/C++ macro string concatenation
...fragment
#define PPCAT_NX(A, B) A ## B
PPCAT_NX("s", "1")
produces this error message from the preprocessing phase of gcc: error: pasting ""s"" and ""1"" does not give a valid preprocessing token
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However, for general token pasting, try this:
/*
* Concatenate preprocessor tokens A and B wit...
Can iterators be reset in Python?
...r protocol is very simple, and only provides one single method (.next() or __next__()), and no method to reset an iterator in general.
The common pattern is to instead create a new iterator using the same procedure again.
If you want to "save off" an iterator so that you can go back to its beginni...
.htaccess - how to force “www.” in a generic way?
...ne On as the first line to complete it, as this could lead to a 500 Server Error if copy-pasted as it is.
– Ryan Casas
Oct 7 '15 at 16:50
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How to grep (search) committed code in the Git history
...p <expression> will work if you run into an "Argument list too long" error.
If you want to limit the search to some subtree (for instance, "lib/util"), you will need to pass that to the rev-list subcommand and grep as well:
git grep <regexp> $(git rev-list --all -- lib/util) -- lib/uti...
What's the difference between a proc and a lambda in Ruby?
...t;Proc:0x3c7d28@(irb):1>
p.call 1, 2 # => 5
p.call 1 # => NoMethodError: undefined method `**' for nil:NilClass
p.call 1, 2, 3 # => 5
l = lambda {|a, b| puts a**2+b**2 } # => #<Proc:0x15016c@(irb):5 (lambda)>
l.call 1, 2 # => 5
l.call 1 # => ArgumentError: wrong number of ...
How can I recursively find all files in current and subfolders based on wildcard matching?
...nt to be notified about directories you don't have permission to (or other errors), you can do find . -name "foo*" 2>/dev/null
– Jobbo
Aug 15 '17 at 10:54
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How can you list the matches of Vim's search?
...dline
" how-to search for a string recursively
" :grep! "\<doLogErrorMsg\>" . -r
"
" how-to search recursively , omit log and git files
" :vimgrep /srch/ `find . -type f \| grep -v .git \| grep -v .log`
" :vimgrep /srch/ `find . -type f -name '*.pm' -o -name '*.pl'`
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How can I drop all the tables in a PostgreSQL database?
...web2py), using the former caused problems:
<class 'psycopg2.ProgrammingError'> no schema has been selected to create in
So to my mind the fully correct answer is:
DROP SCHEMA public CASCADE;
CREATE SCHEMA public;
GRANT ALL ON SCHEMA public TO postgres;
GRANT ALL ON SCHEMA public TO public...
Gzip versus minify
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answered Apr 30 '09 at 15:05
thomasrutterthomasrutter
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