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sqlalchemy unique across multiple columns
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310
Extract from the documentation of the Column:
unique – When True, indicates that this co...
How to use custom packages
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Edson Medina
8,04233 gold badges3434 silver badges4747 bronze badges
answered Feb 24 '13 at 11:14
kostixkostix
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Circle line-segment collision detection algorithm?
...'ve simplified the problem to 2D here, the solution we get applies also in 3D
to get:
Expand
x2 - 2xh + h2 + y2 - 2yk + k2 - r2 = 0
Plug
x = ex + tdx
y = ey + tdy
( ex + tdx )2 - 2( ex + tdx )h + h2 +
( ey + tdy )2 - 2( ey + tdy )k + k2 - r2 = 0
Explode
ex2 + 2extdx + t2dx2 - 2exh - 2tdxh + h2 ...
correct way to define class variables in Python [duplicate]
...ll see it more clearly with some code:
class MyClass:
static_elem = 123
def __init__(self):
self.object_elem = 456
c1 = MyClass()
c2 = MyClass()
# Initial values of both elements
>>> print c1.static_elem, c1.object_elem
123 456
>>> print c2.static_elem, c2.obje...
Regex lookahead, lookbehind and atomic groups
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3 Answers
3
Active
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Get model's fields in Django
...ise it, document it and remove the underscore, which might happen before 1.3 or 1.4. I imagine effort will be made to ensure things are backwards compatible, because lots of people have been using it anyway.
If you're particularly concerned about compatibility, write a function that takes a model a...
What is the most efficient way to store a list in the Django models?
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edited Feb 17 '17 at 13:19
Community♦
111 silver badge
answered Jul 10 '09 at 15:23
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Input from the keyboard in command line application
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138
The correct way to do this is to use readLine, from the Swift Standard Library.
Example:
let ...
How to clear the interpreter console?
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36 Answers
36
Active
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Merge PDF files
... # operation. Thanks to
# https://stackoverflow.com/questions/6773631/problem-with-closing-python-pypdf-writing-getting-a-valueerror-i-o-operation/6773733#6773733
for input_file in input_files:
input_streams.append(open(input_file, 'rb'))
writer = PdfFileWriter(...