得到terminal下的width

这条thread挺有用的：
 http://mail.python.org/pipermail/python-list/2000-May/033564.html

之前只知道用curses模块，windows下面还要安装wcurses，这个1调用就跑出1窗口。

整理下， for linux(windows除了wcurses 不知道)：
1. curses
win = curses.initscr()
w = win.getmaxyx()[1]
curses.endwin()

2. 命令 stty -a， 得到的columns
# stty -a 
speed 38400 baud; rows 58; columns 132; line = 0;
intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = <undef>; eol2 = <undef>; start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R;
werase = ^W; lnext = ^V; flush = ^O; min = 1; time = 0;
-parenb -parodd cs8 -hupcl -cstopb cread -clocal -crtscts
-ignbrk -brkint -ignpar -parmrk -inpck -istrip -inlcr -igncr icrnl ixon -ixoff -iuclc -ixany -imaxbel
opost -olcuc -ocrnl onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0 vt0 ff0
isig icanon iexten echo echoe echok -echonl -noflsh -xcase -tostop -echoprt echoctl echoke

stty size 得到的1对值（rows, columns）
# stty  size
58 132

3. 命令 tput cols
# tput cols
132

4. 1个可用于多数unix的用法：

def getTerminalSize():
 def ioctl_GWINSZ(fd):
 try:
 import fcntl, termios, struct, os
 cr = struct.unpack('hh', fcntl.ioctl(fd, termios.TIOCGWINSZ,
 '1234'))
 except:
 return None
 return cr
 cr = ioctl_GWINSZ(0) or ioctl_GWINSZ(1) or ioctl_GWINSZ(2)
 if not cr:
 try:
 fd = os.open(os.ctermid(), os.O_RDONLY)
 cr = ioctl_GWINSZ(fd)
 os.close(fd)
 except:
 pass
 if not cr:
 try:
 cr = (env['LINES'], env['COLUMNS'])
 except:
 cr = (25, 80)
 return int(cr[1]), int(cr[0])