def prepare_tty():
"set the terminal in char mode (return each keyboard press at once) and"\
" switch off echoing of this input; return the original settings"
stdin_fd = sys.stdin.fileno() # will most likely be 0 ;->
old_stdin_config = termios.tcgetattr(stdin_fd)
[ iflag, oflag, cflag, lflag, ispeed, ospeed, cc ] = \
termios.tcgetattr(stdin_fd)
cc[termios.VTIME] = 1
cc[termios.VMIN] = 1
iflag = iflag & ~(termios.IGNBRK |
termios.BRKINT |
termios.PARMRK |
termios.ISTRIP |
termios.INLCR |
termios.IGNCR |
#termios.ICRNL |
termios.IXON)
# oflag = oflag & ~termios.OPOST
cflag = cflag | termios.CS8
lflag = lflag & ~(termios.ECHO |
termios.ECHONL |
termios.ICANON |
# termios.ISIG |
termios.IEXTEN)
termios.tcsetattr(stdin_fd, termios.TCSANOW,
[ iflag, oflag, cflag, lflag, ispeed, ospeed, cc ])
return (stdin_fd, old_stdin_config)
python类IGNBRK的实例源码
def _fix_tty(self):
"""Set suitable tty options
"""
assert self.tcattr is not None
iflag, oflag, cflag, lflag, ispeed, ospeed, chars = self.tcattr # pylint:disable=unpacking-non-sequence
# equivalent to cfmakeraw
iflag &= ~(termios.IGNBRK | termios.BRKINT | termios.PARMRK | termios.ISTRIP | termios.INLCR |
termios.IGNCR | termios.ICRNL | termios.IXON)
oflag &= ~termios.OPOST
lflag &= ~(termios.ECHO | termios.ECHONL | termios.ICANON | termios.ISIG | termios.IEXTEN)
cflag &= ~(termios.CSIZE | termios.PARENB)
cflag |= termios.CS8
termios.tcsetattr(STDIN, termios.TCSANOW, [iflag, oflag, cflag, lflag, ispeed, ospeed, chars])
def read_single_keypress(msg):
"""Waits for a single keypress on stdin.
This is a silly function to call if you need to do it a lot because it has
to store stdin's current setup, setup stdin for reading single keystrokes
then read the single keystroke then revert stdin back after reading the
keystroke.
Returns the character of the key that was pressed (zero on
KeyboardInterrupt which can happen when a signal gets handled)
"""
import termios, fcntl, sys, os
fd = sys.stdin.fileno()
# save old state
flags_save = fcntl.fcntl(fd, fcntl.F_GETFL)
attrs_save = termios.tcgetattr(fd)
# make raw - the way to do this comes from the termios(3) man page.
attrs = list(attrs_save) # copy the stored version to update
# iflag
attrs[0] &= ~(termios.IGNBRK | termios.BRKINT | termios.PARMRK
| termios.ISTRIP | termios.INLCR | termios. IGNCR
| termios.ICRNL | termios.IXON )
# oflag
attrs[1] &= ~termios.OPOST
# cflag
attrs[2] &= ~(termios.CSIZE | termios. PARENB)
attrs[2] |= termios.CS8
# lflag
attrs[3] &= ~(termios.ECHONL | termios.ECHO | termios.ICANON
| termios.ISIG | termios.IEXTEN)
termios.tcsetattr(fd, termios.TCSANOW, attrs)
# turn off non-blocking
fcntl.fcntl(fd, fcntl.F_SETFL, flags_save & ~os.O_NONBLOCK)
sys.stdout.write(msg)
sys.stdout.flush()
# read a single keystroke
try:
ret = sys.stdin.read(1) # returns a single character
except KeyboardInterrupt:
ret = 0
finally:
# restore old state
termios.tcsetattr(fd, termios.TCSAFLUSH, attrs_save)
fcntl.fcntl(fd, fcntl.F_SETFL, flags_save)
return ret
def get_instruction_key(self):
"""Waits for a single keypress on stdin.
This is a silly function to call if you need to do it a lot because it has
to store stdin's current setup, setup stdin for reading single keystrokes
then read the single keystroke then revert stdin back after reading the
keystroke.
Returns the character of the key that was pressed (zero on
KeyboardInterrupt which can happen when a signal gets handled)
This method is licensed under cc by-sa 3.0
Thanks to mheyman http://stackoverflow.com/questions/983354/how-do-i-make-python-to-wait-for-a-pressed-key\
"""
import termios, fcntl, sys, os
fd = sys.stdin.fileno()
# save old state
flags_save = fcntl.fcntl(fd, fcntl.F_GETFL)
attrs_save = termios.tcgetattr(fd)
# make raw - the way to do this comes from the termios(3) man page.
attrs = list(attrs_save) # copy the stored version to update
# iflag
attrs[0] &= ~(termios.IGNBRK | termios.BRKINT | termios.PARMRK
| termios.ISTRIP | termios.INLCR | termios. IGNCR
| termios.ICRNL | termios.IXON )
# oflag
attrs[1] &= ~termios.OPOST
# cflag
attrs[2] &= ~(termios.CSIZE | termios. PARENB)
attrs[2] |= termios.CS8
# lflag
attrs[3] &= ~(termios.ECHONL | termios.ECHO | termios.ICANON
| termios.ISIG | termios.IEXTEN)
termios.tcsetattr(fd, termios.TCSANOW, attrs)
# turn off non-blocking
fcntl.fcntl(fd, fcntl.F_SETFL, flags_save & ~os.O_NONBLOCK)
# read a single keystroke
try:
ret = sys.stdin.read(1) # returns a single character
except KeyboardInterrupt:
ret = 0
finally:
# restore old state
termios.tcsetattr(fd, termios.TCSAFLUSH, attrs_save)
fcntl.fcntl(fd, fcntl.F_SETFL, flags_save)
return ret
def key_get() -> str:
"""
Waits for a single keypress on stdin.
This is a silly function to call if you need to do it a lot because it has
to store stdin's current setup, setup stdin for reading single keystrokes
then read the single keystroke then revert stdin back after reading the
keystroke.
Returns the character of the key that was pressed (zero on
KeyboardInterrupt which can happen when a signal gets handled)
Reference (StackOverflow):
/questions/983354/how-do-i-make-python-to-wait-for-a-pressed-key
"""
if "posix" == os.name:
fd = sys.stdin.fileno()
# save old state
flags_save = fcntl.fcntl(fd, fcntl.F_GETFL)
attrs_save = termios.tcgetattr(fd)
# make raw - the way to do this comes from the termios(3) man page.
attrs = list(attrs_save) # copy the stored version to update
# iflag
attrs[0] &= ~(termios.IGNBRK | termios.BRKINT | termios.PARMRK
| termios.ISTRIP | termios.INLCR | termios. IGNCR
| termios.ICRNL | termios.IXON)
# oflag
attrs[1] &= ~termios.OPOST
# cflag
attrs[2] &= ~(termios.CSIZE | termios. PARENB)
attrs[2] |= termios.CS8
# lflag
attrs[3] &= ~(termios.ECHONL | termios.ECHO | termios.ICANON
| termios.ISIG | termios.IEXTEN)
termios.tcsetattr(fd, termios.TCSANOW, attrs)
# turn off non-blocking
fcntl.fcntl(fd, fcntl.F_SETFL, flags_save & ~os.O_NONBLOCK)
# read a single keystroke
try:
ret = sys.stdin.read(1) # returns a single character
except KeyboardInterrupt:
ret = str()
finally:
# restore old state
termios.tcsetattr(fd, termios.TCSAFLUSH, attrs_save)
fcntl.fcntl(fd, fcntl.F_SETFL, flags_save)
return ret
elif "nt" == os.name:
try:
# 'getch' by default returns a 'bytes' object;
# so an extra conversion is required
ret = msvcrt.getch().decode()
except KeyboardInterrupt:
ret = str()
return ret
# -------------------------------- FUNCTIONS ----------------------------------
