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Design Patterns web based applications [closed]
...o implement. But you end up with a simpler model and view wherein all the "raw" Servlet API is abstracted completely away. You shouldn't have the need to gather, convert and validate the request parameters yourself. The Controller does this task and sets the gathered, converted and validated request...
How to get the nth element of a python list or a default if not available
...an empty list if n => len(a)
Here is an example of how this works with range(5)
>>> range(5)[3:4]
[3]
>>> range(5)[4:5]
[4]
>>> range(5)[5:6]
[]
>>> range(5)[6:7]
[]
And the full expression
>>> (range(5)[3:4]+[999])[0]
3
>>> (range(5)[4:5...
Easier way to populate a list with integers in .NET [duplicate]
...
You can take advantage of the Enumerable.Range() method:
var numberList = Enumerable.Range(1, 10).ToList();
The first parameter is the integer to start at and the second parameter is how many sequential integers to include.
...
How can I generate random number in specific range in Android? [duplicate]
I want to generate random number in a specific range. (Ex. Range Between 65 to 80)
2 Answers
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ssl证书申请报错：challenge = [c for c in authorization[\'challenges\']...
...['challenges'] if c['type'] == "http-01"][0] IndexError: list index out of rangechallenge-list-index-out-of-range使用acme-tiny申请ssl证书时报错：challenge = [c for c in authorization[& 39;challenges& 39;] if c[& 39;type& 39;] == "http-01"][0] IndexError: list index 使用acme-tiny申请...
Python: print a generator expression?
...A generator expression is a "naked" for expression. Like so:
x*x for x in range(10)
Now, you can't stick that on a line by itself, you'll get a syntax error. But you can put parenthesis around it.
>>> (x*x for x in range(10))
<generator object <genexpr> at 0xb7485464>
This...
C default arguments
...y you can solve the defaults problem and allow for an empty call. #define vrange(...) CALL(range,(param){.from=1, .to=100, .step=1, __VA_ARGS__})
– u0b34a0f6ae
Oct 29 '11 at 4:58
3...
Get the last non-empty cell in a column in Google Sheets
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Question. If instead of A:A, there is an importrange(), how can this be rewritten without doing the same importrange() 4 times?
– Ruby
Mar 6 '19 at 21:54
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Foreign key constraints: When to use ON UPDATE and ON DELETE
...,
PRIMARY KEY (company_id)
) ENGINE=INNODB;
CREATE TABLE USER (
user_id INT,
user_name VARCHAR(50),
company_id INT,
INDEX company_id_idx (company_id),
FOREIGN KEY (company_id) REFERENCES COMPANY (company_id) ON...
) ENGINE=INNODB;
Let's look at the ON UPDATE clause...
How do you use String.substringWithRange? (or, how do Ranges work in Swift?)
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You can use the substringWithRange method. It takes a start and end String.Index.
var str = "Hello, playground"
str.substringWithRange(Range<String.Index>(start: str.startIndex, end: str.endIndex)) //"Hello, playground"
To change the start and e...