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How to add images in select list?
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2020 now and still no way to do this.
– Wingsuit
Apr 7 at 4:20
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Why does this C++ snippet compile (non-void function does not return a value) [duplicate]
... @ComicSansMS yeah I was trying to get an error using rextester and now I just realized I can only receive the error if I remove static which is interesting.
– Shafik Yaghmour
Dec 16 '13 at 15:57
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Python __str__ versus __unicode__
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These I think are solid principles, but in practice it's very common to KNOW there will be nothing but ASCII characters without doing effort to prove it (e.g. the stringified form only has digits, punctuation, and maybe a short ASCII name;-) in which case it's quite typical to move on directly to ...
Python: Why is functools.partial necessary?
... base=2),)
if setattr(f, 'keywords', {'base': 2}) is None][0]
Now combine the named-arguments overridability, plus the setting of three attributes, into a single expression, and tell me just how readable that is going to be...!
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Find the Smallest Integer Not in a List
...wo linear passes through the list, or just one pass if the list length is known to start with. There is no need to represent the hold the entire list in memory, so the algorithm's asymptotic memory usage is just what is needed to represent the array of booleans; i.e. O(N) bits.
(By contrast, algor...
How to save traceback / sys.exc_info() values in a variable?
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try:
a = 1/0
except Exception,e:
exc_tuple = sys.exc_info()
Now If we print the tuple the values will be this.
exc_tuple[0] value will be "ZeroDivisionError"
exc_tuple[1] value will be "integer division or modulo by zero" (String passed as parameter to the exception class)
exc_tuple...
How to jump to a particular line in a huge text file?
...n't jump ahead without reading in the file at least once, since you don't know where the line breaks are. You could do something like:
# Read in the file once and build a list of line offsets
line_offset = []
offset = 0
for line in file:
line_offset.append(offset)
offset += len(line)
file....
Package objects
...ded to effectively use your API:
implicit def a2b(a: A): B = // ...
}
Now the definitions inside that package object are available inside the whole package foo.bar. Furthermore the definitions get imported when someone outside of that package imports foo.bar._.
This way you can prevent to requ...
Why do we have map, fmap and liftM?
..., and has spent a lot of time helping people who are learning the language now, it's not at all clear that it even helped in any way. Certainly not enough to offset the useless redundancy (which itself leads to people asking questions like this one); the Functor class is too common to ignore, and be...
Add unique constraint to combination of two columns
...able and, somehow, the same person got into my Person table twice. Right now, the primary key is just an autonumber but there are two other fields that exist that I want to force to be unique.
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