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How to index into a dictionary?
...As rule of Python DICTIONARY is orderless
If there is
dic = {1: "a", 2: "aa", 3: "aaa"}
Now suppose if I go like dic[10] = "b", then it will not add like this always
dic = {1:"a",2:"aa",3:"aaa",10:"b"}
It may be like
dic = {1: "a", 2: "aa", 3: "aaa", 10: "b"}
Or
dic = {1: "a", 2: "aa", 10...
What is a regular expression for a MAC Address?
...separators after any of the first five octets, meaning that it will accept aa.aa.bbbb.cccc, for example.
– pilcrow
Nov 6 '15 at 4:46
1
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comparing 2 strings alphabetically for sorting purposes
...for sorting purposes. For example I want to have a boolean check like if('aaaa' < 'ab') . I tried it, but it's not giving me correct results, so I guess that's not the right syntax. How do I do this in jquery or Javascript?
...
sed: print only matching group
...ou can do it with a 2nd grep.
# To extract \1 from /xx([0-9]+)yy/
$ echo "aa678bb xx123yy xx4yy aa42 aa9bb" | grep -Eo 'xx[0-9]+yy' | grep -Eo '[0-9]+'
123
4
# To extract \1 from /a([0-9]+)b/
$ echo "aa678bb xx123yy xx4yy aa42 aa9bb" | grep -Eo 'a[0-9]+b' | grep -Eo '[0-9]+'
678
9
...
Arrays, heap and stack and value types
...───────────────────┤
│ 0x4AA4C288 │ -- heap address of `intArray`
24 └───────────────────┘
Memory at address 0x4A963B68 (value of refType) would be something like:
0 ┌──────────...
Difference between and
....B@15663a2
creating bean C: com.xxx.C@cd5f8b
creating bean A: com.yyy.A@157aa53
setting A.bbb with com.xxx.B@15663a2
setting A.ccc with com.xxx.C@cd5f8b
OK, this is nice, but I've removed two rows from the XML and added one. That's not a very big difference. The idea with annotations is that it's ...
How to display gpg key details without importing it?
...ean ...
pub rsa8192 2012-12-25 [SC]
0D69E11F12BDBA077B3726AB4E1F799AA4FF2279
uid Jens Erat (born 1988-01-19 in Stuttgart, Germany)
uid Jens Erat <jens.erat@fsfe.org>
uid Jens Erat <jens.erat@uni-konstanz.de>
uid Jens Erat <jabber@jensera...
Bare asterisk in function arguments?
... # TypeError: func() missing 1 required keyword-only argument: 'b'
func(a="aa", b="bb", c="cc") # TypeError: func() got an unexpected keyword argument 'c'
func(a="aa", b="bb", "cc") # SyntaxError: positional argument follows keyword argument
func(a="aa", b="bb") # aa, bb
the above example with **k...
Checking if a key exists in a JavaScript object?
...
It will return undefined.
var aa = {hello: "world"};
alert( aa["hello"] ); // popup box with "world"
alert( aa["goodbye"] ); // popup box with "undefined"
undefined is a special constant value. So you can say, e.g.
// note the three equ...
Difference between \n and \r?
..., of course \n to put cursor on a new line.
For example, try :
echo -en "AA--AA" ; echo -en "BB" ; echo -en "\rBB"
The first "echo" display AA--AA
The second : AA--AABB
The last : BB--AABB
But don't forget to use -en as parameters.
...