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How to call an external command?
... subprocess
subprocess.run(["ls", "-l"])
The advantage of subprocess vs. system is that it is more flexible (you can get the stdout, stderr, the "real" status code, better error handling, etc...).
The official documentation recommends the subprocess module over the alternative os.system():
Th...
Why do we need C Unions?
...
Unions are often used to convert between the binary representations of integers and floats:
union
{
int i;
float f;
} u;
// Convert floating-point bits to integer:
u.f = 3.14159f;
printf("As integer: %08x\n", u.i);
Although this is technicall...
Convert a string to an enum in C#
What's the best way to convert a string to an enumeration value in C#?
25 Answers
25
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Cast Double to Integer in Java
...imitives, which makes it possible to use them like objects.
Strategy:
To convert a Double to an Integer you would need to follow this strategy:
Convert the Double object to a primitive double. (= "unboxing")
Convert the primitive double to a primitive int. (= "casting")
Convert the primitive int...
Converting a Date object to a calendar object [duplicate]
...);
date = (Date)formatter.parse(date.toString());
DateFormat is used to convert Strings to Dates (parse()) or Dates to Strings (format()). You are using it to parse the String representation of a Date back to a Date. This can't be right, can it?
...
PATH issue with pytest 'ImportError: No module named YadaYadaYada'
...s:
Add the path manually to the test files, something like this:
import sys, os
myPath = os.path.dirname(os.path.abspath(__file__))
sys.path.insert(0, myPath + '/../')
Run the tests with the env var PYTHONPATH=../.
shar...
Query to list all stored procedures
... to use information_schema. As long as you're not in the master database, system stored procedures won't be returned.
SELECT *
FROM DatabaseName.INFORMATION_SCHEMA.ROUTINES
WHERE ROUTINE_TYPE = 'PROCEDURE'
If for some reason you had non-system stored procedures in the master database, you co...
How to hash a password
...e combined salt+hash into a string for storage
string savedPasswordHash = Convert.ToBase64String(hashBytes);
DBContext.AddUser(new User { ..., Password = savedPasswordHash });
STEP 5 Verify the user-entered password against a stored password
/* Fetch the stored value */
string savedPasswordHash ...
What is a rune?
...nt a rune code-point, a string value can also contain runes. So, it can be converted to a []rune, or vice versa.
The unicode package http://golang.org/pkg/unicode/ can give a taste of the richness of the challenge.
share
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Convert file path to a file URI?
Does the .NET Framework have any methods for converting a path (e.g. "C:\whatever.txt" ) into a file URI (e.g. "file:///C:/whatever.txt" )?
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