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Don't understand why UnboundLocalError occurs (closure) [duplicate]
...lError from a statement that uses an unbounded imported name. Example: def foo(): bar = deepcopy({'a':1}); from copy import deepcopy; return bar, then from copy import deepcopy; foo(). The call succeeds if the local import from copy import deepcopy is removed.
– Yibo Yang
...
How to convert a string from uppercase to lowercase in Bash? [duplicate]
...n state the case of the value throughout the variable's use.
$ declare -u FOO=AbCxxx
$ echo $FOO
ABCXXX
"-l" does lc.
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Show a number to two decimal places
..._format():
return number_format((float)$number, 2, '.', '');
Example:
$foo = "105";
echo number_format((float)$foo, 2, '.', ''); // Outputs -> 105.00
This function returns a string.
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How to force cp to overwrite without confirmation
.... However, if you use -nf it adds the ability to clear the -i. So:
cp -f /foo/* /bar <-- Prompt
cp -nf /foo/* /bar <-- No Prompt
Pretty neat huh? /necropost
What really happens in a try { return x; } finally { x = null; } statement?
...nt Test() {
try {
return SomeNumber();
} finally {
Foo();
}
}
compiles to:
.method private hidebysig static int32 Test() cil managed
{
.maxstack 1
.locals init (
[0] int32 CS$1$0000)
L_0000: call int32 Program::SomeNumber()
L_0005: stloc.0
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How to combine paths in Java?
...The Paths helper class is useful too. For example:
Path path = Paths.get("foo", "bar", "baz.txt");
If you need to cater for pre-Java-7 environments, you can use java.io.File, like this:
File baseDirectory = new File("foo");
File subDirectory = new File(baseDirectory, "bar");
File fileInDirectory...
Shell script to send email [duplicate]
...
#!/bin/sh
#set -x
LANG=fr_FR
# ARG
FROM="foo@bar.com"
TO="foo@bar.com"
SUBJECT="test é"
MSG="BODY éé"
FILES="fic1.pdf fic2.pdf"
# http://fr.wikipedia.org/wiki/Multipurpose_Internet_Mail_Extensions
SUB_CHARSET=$(echo ${SUBJECT} | file -bi - | cut -d"=" -f2)
SUB_B...
Git - Ignore files during merge
...t-in merge strategy. But it seems that one can write <pattern> merge=foo, then git config --global merge.foo.driver true, and it will work the same way.
– Kyle Strand
Oct 14 '19 at 18:22
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MySQL Conditional Insert
...ple, if you SELECT COUNT(*) FROM dual you always get 1, and if you SELECT 'foo' FROM dual you always get foo. But you can't SELECT * FROM dual and you can't DESCRIBE dual or anything like that. I haven't checked, but I also don't think you can revoke permissions on dual, either. So it's worth pointi...
How to execute mongo commands through shell scripts?
...as an environment variable:
mongo --eval 'db.mycollection.update({"name":"foo"},{$set:{"this":"that"}});' myDbName
Otherwise you may see something like this:
mongo --eval "db.test.update({\"name\":\"foo\"},{$set:{\"this\":\"that\"}});"
> E QUERY SyntaxError: Unexpected token :
...