python Programming Glossary: dis

Why does Python code run faster in a function?

http://stackoverflow.com/questions/11241523/why-does-python-code-run-faster-in-a-function

at toplevel it is a global. To examine bytecode use the dis module . I was able to disassemble the function directly but.. To examine bytecode use the dis module . I was able to disassemble the function directly but to disassemble the toplevel.. . I was able to disassemble the function directly but to disassemble the toplevel code I had to use the compile builtin ...

How should I understand the output of dis.dis?

http://stackoverflow.com/questions/12673074/how-should-i-understand-the-output-of-dis-dis

should I understand the output of dis.dis I would like to understand how to use dis the dissembler.. should I understand the output of dis.dis I would like to understand how to use dis the dissembler of.. output of dis.dis I would like to understand how to use dis the dissembler of Python bytecode . Specifically how should..

Accessing 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

class 䏭 suite finishes execution its execution frame is discarded but its local namespace is saved . 4 A class object is.. you ever wanted You can see this all in action using the dis module . I'm using Python 3.3 in the following examples because.. line and executes that as if it were a function import dis def foo ... class Foo ... x 5 ... y x for i in range 1 ... return..

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

number of values the caller is exp import inspect import dis def expecting offset 0 Return how many values the caller is.. f.f_code.co_code instruction ord bytecode i if instruction dis.opmap 'UNPACK_SEQUENCE' return ord bytecode i 1 elif instruction.. 'UNPACK_SEQUENCE' return ord bytecode i 1 elif instruction dis.opmap 'POP_TOP' return 0 else return 1 def count # offset 3..

What do backticks mean to the python interpreter: `num`

http://stackoverflow.com/questions/1673071/what-do-backticks-mean-to-the-python-interpreter-num

namespace for __repr__ respectively. EDIT Using the dis module proves my assumption def f1 a return repr a def f2 a.. a.__repr__ def f3 a return `a` Disassembling shows import dis dis.dis f1 3 0 LOAD_GLOBAL 0 repr 3 LOAD_FAST 0 a 6 CALL_FUNCTION.. def f3 a return `a` Disassembling shows import dis dis.dis f1 3 0 LOAD_GLOBAL 0 repr 3 LOAD_FAST 0 a 6 CALL_FUNCTION..

Python `if x is not None` or `if not x is None`?

http://stackoverflow.com/questions/2710940/python-if-x-is-not-none-or-if-not-x-is-none

Python 2.6.2 r262 71600 Apr 15 2009 07 20 39 import dis def f x ... return x is not None ... dis.dis f 2 0 LOAD_FAST.. 07 20 39 import dis def f x ... return x is not None ... dis.dis f 2 0 LOAD_FAST 0 x 3 LOAD_CONST 0 None 6 COMPARE_OP 9.. 20 39 import dis def f x ... return x is not None ... dis.dis f 2 0 LOAD_FAST 0 x 3 LOAD_CONST 0 None 6 COMPARE_OP 9 is..

Python Compilation/Interpretation Process

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

operation is indicated. You can see this bytecode with the dis module as follows def fib n return n if n 2 else fib n 2 fib.. return n if n 2 else fib n 2 fib n 1 ... fib 10 55 import dis dis.dis fib 1 0 LOAD_FAST 0 n 3 LOAD_CONST 1 2 6 COMPARE_OP.. n if n 2 else fib n 2 fib n 1 ... fib 10 55 import dis dis.dis fib 1 0 LOAD_FAST 0 n 3 LOAD_CONST 1 2 6 COMPARE_OP 0..

if loop: x not in VS not x in [duplicate]

http://stackoverflow.com/questions/3481554/if-loop-x-not-in-vs-not-x-in

make identical bytecode as you can clearly verify import dis dis.dis compile 'if x not in d pass' '' 'exec' 1 0 LOAD_NAME.. identical bytecode as you can clearly verify import dis dis.dis compile 'if x not in d pass' '' 'exec' 1 0 LOAD_NAME 0 x.. bytecode as you can clearly verify import dis dis.dis compile 'if x not in d pass' '' 'exec' 1 0 LOAD_NAME 0 x 3..

while (1) Vs. for while(True) — Why is there a difference?

http://stackoverflow.com/questions/3815359/while-1-vs-for-whiletrue-why-is-there-a-difference

not the case in python2.7. The following script import dis def while_one while 1 pass def while_true while True pass print.. pass def while_true while True pass print while 1 print dis.dis while_one print while True print dis.dis while_true produces.. def while_true while True pass print while 1 print dis.dis while_one print while True print dis.dis while_true produces..

Free Python decompiler that is not an online service? [closed]

http://stackoverflow.com/questions/48211/free-python-decompiler-that-is-not-an-online-service

service that you need to upload a pyc or pyo file to the dis module allows you to disassemble but not decompile bytecode.. upload a pyc or pyo file to the dis module allows you to disassemble but not decompile bytecode decompile.py works only for..

Are tuples more efficient than lists in Python?

http://stackoverflow.com/questions/68630/are-tuples-more-efficient-than-lists-in-python

python performance share improve this question The dis module disassembles the byte code for a function and is useful.. performance share improve this question The dis module disassembles the byte code for a function and is useful to see the.. 5 ... y x 2 ... def b ... x 1 2 3 4 5 ... y x 2 ... import dis dis.dis a 2 0 LOAD_CONST 1 1 3 LOAD_CONST 2 2 6 LOAD_CONST..

Is Python interpreted or compiled or both?

http://stackoverflow.com/questions/6889747/is-python-interpreted-or-compiled-or-both

is interpreted compiled too but it's still an important distinction both because it aids understanding and because there.. statement a b.c is compiled to a byte stream which when disassembled looks somewhat like load 0 b load_str 'c' get_attr.. low level you can experiment with the standard library dis module and see what the real deal looks like. Interpreting this..

In Python, what is the difference between “.append()” and “+= []”?

http://stackoverflow.com/questions/725782/in-python-what-is-the-difference-between-append-and

BUILD_LIST outweighs LOAD_ATTR CALL_FUNCTION . import dis dis.dis compile s s.append 'spam' '' 'exec' 1 0 BUILD_LIST 0.. BUILD_LIST outweighs LOAD_ATTR CALL_FUNCTION . import dis dis.dis compile s s.append 'spam' '' 'exec' 1 0 BUILD_LIST 0 3 STORE_NAME.. outweighs LOAD_ATTR CALL_FUNCTION . import dis dis.dis compile s s.append 'spam' '' 'exec' 1 0 BUILD_LIST 0 3 STORE_NAME..

Order of syntax for using 'not' and 'in' keywords

http://stackoverflow.com/questions/8738388/order-of-syntax-for-using-not-and-in-keywords

than an in operation and then negating the result import dis def notin 'ham' not in 'spam and eggs' dis.dis notin 2 0 LOAD_CONST.. result import dis def notin 'ham' not in 'spam and eggs' dis.dis notin 2 0 LOAD_CONST 1 'ham' 3 LOAD_CONST 2 'spam and eggs'.. import dis def notin 'ham' not in 'spam and eggs' dis.dis notin 2 0 LOAD_CONST 1 'ham' 3 LOAD_CONST 2 'spam and eggs'..