Re: initilize a memory zone in python
Mug schrieb: On Aug 30, 8:58 pm, "Diez B. Roggisch" wrote: Mug schrieb: hello, i'm new in python, i used to program in C, i have a small problem, i tryed to do some serial port things manipulation with python. i have something like: import sys,termios fd = sys.stdin.fileno() term_conf=termios.tcgetattr(fd); now i want to modify the actuall values in term_conf zone to zero i don't see how to do it, in C we can do : bzero(&term_conf,sizeof(struct termios)); i want to know if it exist a similar function in python, thanks In python you don't modify memory like that. For the above function, you pass a value as the one you got to tcgetattr, with values modified as you desire them. i tryed print term_conf and i saw that the term_conf is actually represent with an array in python: zsh/3 4201 [1] % python test.py [27906, 5, 1215, 35387, 15, 15, ['\x03', '\x1c', '\x7f', '\x15', '\x04', '\x00', '\x01', '\xff', '\x11', '\x13', '\x1a', '\xff', '\x12', '\x0f', '\x17', '\x16', '\xff', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00']] it's a array of 7 elements, with the seventh element it self a array, so in order to initialize them to zero, there's no other way than modify them one by one in a loop? is there a fonction like "memset" or "bzero" in python? Again: no, there is no such function. But for the above, you'd easily write: foo = [0] * 7 # only do this with immutables foo[-1] = ['\x00'] * 16 alternatively, you modify the result you got from tcgetattr in the places you want. Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: initilize a memory zone in python
On Aug 30, 4:59 pm, Mug wrote: (snip) > is there a fonction like "memset" or "bzero" in python? Not that i know of ;). Try this link for a coverage of the Python built-in functions. You cannot write quality Python code without them. http://docs.python.org/3.1/library/functions.html What you refer to as an array is called a list round here, see this informative read http://docs.python.org/3.1/library/stdtypes.html#sequence-types-str-bytes-bytearray-list-tuple-range And be sure to check out list comprehentions too, just icing on the cake ;) python 3000 docs http://docs.python.org/3.1/ -- http://mail.python.org/mailman/listinfo/python-list
Re: initilize a memory zone in python
On 2009-08-31, Grant Edwards wrote: > If you want a configuration that's all zeros, why bother > calling tcgetattr() at all? Just set the configuration to > zeros: > > term_conf = [0,0,0,0,0,0] Oops, I forgot about cc. That should be: term_conf = [0,0,0,0,0,0,['\x00']*32] That's why it's easier to just use pyserial ;) -- Grant -- http://mail.python.org/mailman/listinfo/python-list
Re: initilize a memory zone in python
On 2009-08-30, Mug wrote: > hello, i'm new in python, i used to program in C, i have a > small problem, i tryed to do some serial port things You're probably better off just using pyserial: http://pyserial.sourceforge.net/ If you really want to muck about with termios stuff, you can look at the posix serial module in pyserial to see how it's done. > import sys,termios > > fd = sys.stdin.fileno() > term_conf=termios.tcgetattr(fd); > > now i want to modify the actuall values in term_conf zone to > zero Have you looked at the documentation for termios.tcgettattr()? It returns a list of integers. If you want set them to zero, then just set them to zero. If you want a configuration that's all zeros, why bother calling tcgetattr() at all? Just set the configuration to zeros: term_conf = [0,0,0,0,0,0] -- Grant -- http://mail.python.org/mailman/listinfo/python-list
Re: initilize a memory zone in python
On Aug 30, 8:58 pm, "Diez B. Roggisch" wrote: > Mug schrieb: > > > hello, i'm new in python, i used to program in C, > > i have a small problem, i tryed to do some serial port things > > manipulation > > with python. > > i have something like: > > > import sys,termios > > > fd = sys.stdin.fileno() > > term_conf=termios.tcgetattr(fd); > > > now i want to modify the actuall values in term_conf zone to zero > > i don't see how to do it, > > in C we can do : bzero(&term_conf,sizeof(struct termios)); > > i want to know if it exist a similar function in python, thanks > > In python you don't modify memory like that. > > For the above function, you pass a value as the one you got to > tcgetattr, with values modified as you desire them. i tryed print term_conf and i saw that the term_conf is actually represent with an array in python: zsh/3 4201 [1] % python test.py [27906, 5, 1215, 35387, 15, 15, ['\x03', '\x1c', '\x7f', '\x15', '\x04', '\x00', '\x01', '\xff', '\x11', '\x13', '\x1a', '\xff', '\x12', '\x0f', '\x17', '\x16', '\xff', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00']] it's a array of 7 elements, with the seventh element it self a array, so in order to initialize them to zero, there's no other way than modify them one by one in a loop? is there a fonction like "memset" or "bzero" in python? > > Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: initilize a memory zone in python
Mug schrieb: hello, i'm new in python, i used to program in C, i have a small problem, i tryed to do some serial port things manipulation with python. i have something like: import sys,termios fd = sys.stdin.fileno() term_conf=termios.tcgetattr(fd); now i want to modify the actuall values in term_conf zone to zero i don't see how to do it, in C we can do : bzero(&term_conf,sizeof(struct termios)); i want to know if it exist a similar function in python, thanks In python you don't modify memory like that. For the above function, you pass a value as the one you got to tcgetattr, with values modified as you desire them. Diez -- http://mail.python.org/mailman/listinfo/python-list
initilize a memory zone in python
hello, i'm new in python, i used to program in C, i have a small problem, i tryed to do some serial port things manipulation with python. i have something like: import sys,termios fd = sys.stdin.fileno() term_conf=termios.tcgetattr(fd); now i want to modify the actuall values in term_conf zone to zero i don't see how to do it, in C we can do : bzero(&term_conf,sizeof(struct termios)); i want to know if it exist a similar function in python, thanks -- http://mail.python.org/mailman/listinfo/python-list
