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Why does this C++ snippet compile (non-void function does not return a value) [duplicate]
...dard in section 1.3.24 which says:
[...]Permissible undefined behavior ranges from ignoring the situation completely with unpredictable results, to behaving during translation or program execution in a documented manner characteristic of the environment (with or without the issuance of a diagnos...
GroupBy pandas DataFrame and select most common value
... str(random.randint(123456789001, 123456789100))] for i in range(1000000)]
scale_test_input = pd.DataFrame(columns=['key', 'value'],
data=scale_test_data)
start = time.time()
mode(scale_test_input, ['key'], 'value', 'count')
print time.time() - start
...
How to parse a string to an int in C++?
...tinguish between bad input (e.g. "123foo") and a number that is out of the range of int (e.g. "4000000000" for 32-bit int)? With stringstream, there is no way to make this distinction. We only know whether the conversion succeeded or failed. If it fails, we have no way of knowing why it failed. As y...
Why 0 is true but false is 1 in the shell?
...ios. A particular example is xargs which uses different error codes in the range around 127 to indicate how a group of commands failed. The conversion which can be done is int to bool where 0 maps to success (which I guess you want to express as true / 1; but realize that this is just another arbitr...
What is the most pythonic way to check if an object is a number?
...lowing output:
class A: pass
def foo(): return 1
for x in [1,1.4, A(), range(10), foo, foo()]:
answer = isNumber(x)
print('{answer} == isNumber({x})'.format(**locals()))
Output:
True == isNumber(1)
True == isNumber(1.4)
False == isNumber(<__main__.A instance at 0x7ff52c15d878>)
...
Expand/collapse section in UITableView in iOS
...d try to expand/collapse again, I get a fatal error saying index is out of range. Is there any way to fix this? Thanks!
– iamhx
Apr 22 '17 at 13:43
...
Django - how to create a file and save it to a model's FileField?
...v_writer = csv.writer(f)
csv_writer.writerow(('col1'))
for num in range(3):
csv_writer.writerow((num, ))
month_end_file = MonthEnd()
month_end_file.report.name = path
month_end_file.save()
from my_app.models import MonthEnd
#serve it up as a download
def get_report(re...
What is the difference between square brackets and parentheses in a regex?
...class" that means "any character from a,b or c" (a character class may use ranges, e.g. [a-d] = [abcd])
The reason these regexes are similar is that a character class is a shorthand for an "or" (but only for single characters). In an alternation, you can also do something like (abc|def) which does...
Regular expression to match non-ASCII characters?
...or unicode you can look at this 2 resources:
Code charts list of Unicode ranges
This tool to create a regex filtered by Unicode block.
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How do I detect unsigned integer multiply overflow?
...ltiplication just to be sure it really is safe. Given the potentially huge range of values that report false negatives, this has no real value, when algorithms exist to return the correct answer, without a validation step.
– Brett Hale
Jan 17 '15 at 8:47
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