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python Programming Glossary: bytecodesAccessing class variables from a list comprehension in the class definition http://stackoverflow.com/questions/13905741/accessing-class-variables-from-a-list-comprehension-in-the-class-definition the python interpreter knows how to access those given the bytecodes presented. The important thing to remember here is that Python..
http://stackoverflow.com/questions/15541404/python-string-interning the first two examples behave the same. If we examine the bytecodes we'll see that they are exactly the same # s1 string 2 0 LOAD_CONST..
CPython is bytecode interpreter? http://stackoverflow.com/questions/1644619/cpython-is-bytecode-interpreter It compiles .py files to .pyc files. .pyc files contain bytecodes. The CPython implementation also interprets those bytecodes... The CPython implementation also interprets those bytecodes. CPython is not written in C it is C. The compilation from .py..
Find out into how many values a return value will be unpacked http://stackoverflow.com/questions/16481156/find-out-into-how-many-values-a-return-value-will-be-unpacked 'POP_TOP' return 0 else return 1 def count # offset 3 bytecodes from the call op to the unpack op return range expecting offset..
Is a variable swap guaranteed to be atomic in python? http://stackoverflow.com/questions/2623086/is-a-variable-swap-guaranteed-to-be-atomic-in-python could be changed by another thread between the LOAD_GLOBAL bytecodes before or after the ROT_TWO and between the STORE_GLOBAL bytecodes... before or after the ROT_TWO and between the STORE_GLOBAL bytecodes. If you want to swap two variables atomically you'll need a..
Why tuple is faster than list? http://stackoverflow.com/questions/3340539/why-tuple-is-faster-than-list built just once when the compiler turns the source into bytecodes and stashed away in the constants table of the relevant function.. table of the relevant function or module. When those bytecodes execute they just need to recover the pre built constant tuple..
Python: Why should 'from <module> import *' be prohibited? http://stackoverflow.com/questions/3571514/python-why-should-from-module-import-be-prohibited nested scopes the compiler which turns Python source into bytecodes has to generate different code to access variables in a containing..
In Python, what is the difference between “.append()” and “+= []”? http://stackoverflow.com/questions/725782/in-python-what-is-the-difference-between-append-and the left hand side list. Update perf analysis Comparing bytecodes we can assume that append version wastes cycles in LOAD_ATTR..
Python: why are * and ** faster than / and sqrt()? http://stackoverflow.com/questions/8068019/python-why-are-and-faster-than-and-sqrt 0.5 x4 math.sqrt 1234567890.0 compiles to the following bytecodes # x1 1234567890.0 4.0 4 0 LOAD_CONST 1 1234567890.0 3 LOAD_CONST..
Developing a heuristic to test simple anonymous Python functions for equivalency http://stackoverflow.com/questions/9963155/developing-a-heuristic-to-test-simple-anonymous-python-functions-for-equivalency All of them seem hard so any ideas appreciated. Comparing bytecodes might work but it might be annoying that it's implementation..
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