Short for disrespect. Transitive verb. To sneer at, belittle, or show disregard for. In some neighborhoods, this can get you killed.

I figured I should elaborate on one of the above meanings. All of the below information is from Dante's Divine Comedy. Specifically the first part, Inferno. I don't really believe it all but I do think it's cool to read.

Dis is basicaly the center of Hell and therefore the center of the Universe.

Hell can be divided into two main parts that are then divided into smaller sections called circles. One part is for sins of weakness. ex: Being born before Christ and therefore not Christian, lasciviousness, gluttony, incontinence, failing to choose a side (not having any religion). The other part is for willful sins. ex: blasphemy, sodomy, usury, and treachery.

The importance of this is that the City of Dis is where all the willful sinners go. The fiery city walls seperate the two parts of Hell. Satan is at the very center of the City and is embedded in ice while knawing on the three worst sinners, Brutus and Cassius(betrayed Caesar), Judas (betrayed Christ).

dis is an amusing little module provided as part of the standard library of the Python programming language. The name is short for disassemble, and it provides functionality similar to that of machine code disassemblers (rarely used anymore except by crackers).

Situations calling for the disassembly of Python bytecode are truly rare, but it can provide some insight into how Python works, deep down. The most obvious thing you notice when you see Python bytecode is how high level it is. Contrast it with, for example, Java bytecode, which is quite similar to the instructions of a hardware CPU. Python's instuction set, while giving away the fact that the Python virtual machine is stack based, mostly consists of higher level operations which mostly map directly to your understanding of Python's mechanics, such as resolving names and preparing exception handlers. Disassembling some random code when I first learned of the module, it was driven home to me how dynamic Python is; I mean, I knew it was dynamic, but here was proof in black and white.

One of the major problems facing persons involved in the study of disassembled CPU code is that many of the references to data which had such clever, entertaining, and hopefully helpful names in the source code, now are reduced to meaningless numbers, such as offsets from stack or other pointers and absolute memory addresses. The dynamism of Python prevents that problem: every name the programmer typed in is still there -- every module name, function name, class name, variable name, object attribute name, you name it.

Looking at the code involved in a common statement such as sys.stderr.write(string.join(errors)) makes you really glad that computers are fast, as you see the chains of LOAD_ATTR opcodes, each showing the name that will need to be looked up in a dictionary.

The only time I really needed dis, though, was when I was writing a multi-threaded program and wanted to see if the operation of adding two lists together is performed atomically. (Well, I could have dug through the source code of Python, but this was much easier.) I'll leave it to you to use dis to find the answer to that question yourself, if you're curious.

The workhorse in the module is the disassemble function (also known as disco). This function disassembles a supplied code object and prints the code to sys.stdout. But the convenience function that is normally used is dis.dis, which accepts a code object, a function, a method, or a class, and disassembles them all (essentially finding all the code objects within the supplied object and calling disassemble for each one).

To whet your appetite, here is the disassembly of the code fragment I showed above:

          0 SET_LINENO               1

          3 SET_LINENO               2
          6 BUILD_LIST               0
          9 STORE_FAST               0 (errors)

         12 SET_LINENO               3
         15 LOAD_GLOBAL              1 (sys)
         18 LOAD_ATTR                2 (stderr)
         21 LOAD_ATTR                3 (write)
         24 LOAD_GLOBAL              4 (string)
         27 LOAD_ATTR                5 (join)
         30 LOAD_FAST                0 (errors)
         33 CALL_FUNCTION            1
         36 CALL_FUNCTION            1
         39 POP_TOP             
         40 LOAD_CONST               0 (None)
         43 RETURN_VALUE        

Dis (?), n. [L.]

The god Pluto.



© Webster 1913.

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