python Programming Glossary: boolean

http://stackoverflow.com/questions/1011431/common-pitfalls-in-python

is 0 None etc. if var is True # only execute if var is boolean True not 1 if var is False # only execute if var is boolean.. True not 1 if var is False # only execute if var is boolean False not 0 if var is None # same as var None Do not check if..

if x or y or z == blah

http://stackoverflow.com/questions/15112125/if-x-or-y-or-z-blah

share improve this question You misunderstand how boolean expressions work. You are looking for if x 1 or y 1 or z 1 x.. expressions. The expression x or y 1 is treated as first a boolean test for x then if that is False the expression y 1 is tested... that is 'truthy' e.g. not False numeric 0 or empty see boolean expressions for details on what Python considers false in a..

Does Python support short-circuiting?

http://stackoverflow.com/questions/2580136/does-python-support-short-circuiting

short circuiting Does Python support short circuiting in boolean expressions python short circuiting share improve this question..

Is False == 0 and True == 1 in Python an implementation detail or is it guaranteed by the language?

http://stackoverflow.com/questions/2764017/is-false-0-and-true-1-in-python-an-implementation-detail-or-is-it-guarante

documentation officially say that programmers can rely on booleans inheriting from integers with the values 0 and 1 . This question.. that won't fail because of implementation details python boolean share improve this question In Python 2.x this is not guaranteed.. and False to be reassigned. However even if this happens boolean True and boolean False are still properly returned for comparisons...

Speed up bitstring/bit operations in Python?

http://stackoverflow.com/questions/2897297/speed-up-bitstring-bit-operations-in-python

2 MemoryError As you can imagine allocating 1 billion boolean values 1 byte 4 or 8 bytes see comment each in Python is really..

String comparison in Python: is vs. == [duplicate]

http://stackoverflow.com/questions/2988017/string-comparison-in-python-is-vs

integers to be compared with is but don't rely on it. For boolean values you shouldn't be doing comparisons at all. Instead of..

Is it Pythonic to use bools as ints?

http://stackoverflow.com/questions/3174392/is-it-pythonic-to-use-bools-as-ints

Is this this kind of use Pythonic or should it be avoided boolean python share improve this question I'll be the odd voice..

Peak detection in a 2D array

http://stackoverflow.com/questions/3684484/peak-detection-in-a-2d-array

detect the peaks usingthe local maximum filter. Returns a boolean mask of the peaks i.e. 1 when the pixel's value is the neighborhood..

How can I improve my paw detection?

http://stackoverflow.com/questions/4087919/how-can-i-improve-my-paw-detection

for some reason... Threshold the array so that you have a boolean array of places where the pressure is over some threshold value..

Why does “[] == False” evaluate to False when “if not []” succeeds?

http://stackoverflow.com/questions/10440792/why-does-false-evaluate-to-false-when-if-not-succeeds

this question The if statement evaluates everything in a Boolean context it is like there is an implicit call to the bool built..

Boolean value of objects in Python

http://stackoverflow.com/questions/1087135/boolean-value-of-objects-in-python

value of objects in Python As we know Python has boolean values..

Setting Camera Parameters in OpenCV/Python

http://stackoverflow.com/questions/11420748/setting-camera-parameters-in-opencv-python

Exposure only for cameras . CV_CAP_PROP_CONVERT_RGB Boolean flags indicating whether images should be converted to RGB...

Interpreting a benchmark in C, Clojure, Python, Ruby, Scala and others [closed]

http://stackoverflow.com/questions/11641098/interpreting-a-benchmark-in-c-clojure-python-ruby-scala-and-others

if optimization doesn't work def isPrime n Int i Int 2 Boolean if i n true else if n i 0 isPrime n i 1 else false Clojure defn..

Evaluation of boolean expressions in Python

http://stackoverflow.com/questions/1452489/evaluation-of-boolean-expressions-in-python

value do objects evaluate to in Python Related Questions Boolean Value of Objects in Python Discussion about overriding the way.. for use in an if or while condition or as operand of the Boolean operations below. The following values are considered false.. always true. Operations and built in functions that have a Boolean result always return 0 or False for false and 1 or True for..

Is False == 0 and True == 1 in Python an implementation detail or is it guaranteed by the language?

http://stackoverflow.com/questions/2764017/is-false-0-and-true-1-in-python-an-implementation-detail-or-is-it-guarante

say There are two types of integers ... Integers int ... Booleans bool and in the boolean subsection Booleans These represent.. int ... Booleans bool and in the boolean subsection Booleans These represent the truth values False and True ... Boolean.. These represent the truth values False and True ... Boolean values behave like the values 0 and 1 respectively in almost..

String comparison in Python: is vs. == [duplicate]

http://stackoverflow.com/questions/2988017/string-comparison-in-python-is-vs

to just use ' ' by default even when comparing int or Boolean values I've always liked to use 'is' because I find it more.. to just use ' ' by default even when comparing int or Boolean values You use when comparing values and is when comparing identities...

Python Compilation/Interpretation Process

http://stackoverflow.com/questions/3299648/python-compilation-interpretation-process

perform an inequality comparison between them pushing the Boolean result back onto the stack. The fourth instruction determines.. the stack. The fourth instruction determines based on the Boolean value whether to jump forward five instructions or continue.. POP_TOP I'm guessing JUMP_IF_FALSE is defined to leave its Boolean argument on the stack rather than popping it so it has to be..

check if all elements in a list are identical

http://stackoverflow.com/questions/3844801/check-if-all-elements-in-a-list-are-identical

list compare adjacent elements and AND all the resulting Boolean values. But I'm not sure what's the most Pythonic way to do..

Ternary conditional operator in Python

http://stackoverflow.com/questions/394809/ternary-conditional-operator-in-python

is evaluated then either a or b is returned based on the Boolean value of test if test evaluates to True a is returned else b..

How do I create a Django form that displays a checkbox label to the right of the checkbox?

http://stackoverflow.com/questions/572263/how-do-i-create-a-django-form-that-displays-a-checkbox-label-to-the-right-of-the

similar to this def class MyForm forms.Form check forms.BooleanField required True label Check this It expands to HTML that.. method in the Field classes override the one for the Boolean field and use that method in _html_output . Sadly the Django..

Most elegant way to check if the string is empty in Python?

http://stackoverflow.com/questions/9573244/most-elegant-way-to-check-if-the-string-is-empty-in-python

are falsy which means they are considered false in a Boolean context so you can just do this if not myString This is the..