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Design patterns or best practices for shell scripts [closed]
...iables inside the function as local:
function foo {
local bar="$0"
}
Error prone situations
In bash, unless you declare otherwise, an unset variable is used as an empty string. This is very dangerous in case of typo, as the badly typed variable will not be reported, and it will be evaluated a...
How to get string objects instead of Unicode from JSON?
...
@Oren: This is not an error in the YAML spec but in the PyYAML parser. The YAML parser from ruamel works.
– Brutus
Jun 4 '15 at 10:21
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How to declare a structure in a header that is to be used by multiple files in c?
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You might get a linker error, or you might not. In C, the linkage model allows for 'common' definitions, so multiple definitions with no initializer (and maybe with the same initializer) may work. It is a 'common extension'. Some compilers suppo...
Uses for Optional
...ld be a legal representation of a state (see Map.get) or an implementation error like a missing or failed initialization.
This changes dramatically with the persistent use of Optional. Here, already the occurrence of null signifies the presence of a bug. (Because if the value were allowed to be mis...
How to remove/ignore :hover css style on touch devices
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I've used try/catch just in case some odd error shows up, that could crash the script, like deleteRule not working because of same-origin policy or flaky support on IE (edited the comment to reflect that). But yeah, in most cases, just a simple check should be suffic...
How to check whether a pandas DataFrame is empty?
... @Quant - The documentation has a discussion on why bool raises an error for a dataframe here: link. Quote: "Should it be True because it’s not zero-length? False because there are False values? It is unclear, so instead, pandas raises a ValueError"
– Bij
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How to create a unique index on a NULL column?
... index like that, make sure that ANSI_NULLS is ON, otherwise you'll get an error when trying to insert data.
– Arne
Oct 1 '12 at 7:35
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E731 do not assign a lambda expression, use a def
...ile. One might say "f" whereas the other says "lambda". Maybe the lambda error is easier to scan because it's not a single-character function name, or a poorly-named long name?
– g33kz0r
Feb 17 '15 at 19:08
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What is Autoloading; How do you use spl_autoload, __autoload and spl_autoload_register?
...nless I have a class which extends another class (parent). PHP then throws error that it cannot find that parent class, even they're all in the same directory/namespace! What is confusing is that literally only first level classes are found, so I had to put another spl_autoload_register() with anony...
source of historical stock data [closed]
... Dividend/Share
d1 Last Trade Date
d2 Trade Date
e Earnings/Share
e1 Error Indication (returned for symbol changed / invalid)
e7 EPS Estimate Current Year
e8 EPS Estimate Next Year
e9 EPS Estimate Next Quarter
f6 Float Shares
g Day's Low
h Day's High
j 52-week Low
k 52-week High
g1...