是否有办法从用户输入中读取单个字符?例如,他们在终端上按下一个键,它就会返回(有点像getch())。我知道Windows中有这个功能,但我想要跨平台的东西。
当前回答
内置的raw_input应该会有所帮助。
for i in range(3):
print ("So much work to do!")
k = raw_input("Press any key to continue...")
print ("Ok, back to work.")
其他回答
另一个回答中的一个评论提到了cbreak模式,这对Unix实现很重要,因为您通常不希望^C (KeyboardError)被getchar使用(当您将终端设置为原始模式时,它会被使用,就像大多数其他回答所做的那样)。
另一个重要的细节是,如果您希望读取一个字符而不是一个字节,您应该从输入流中读取4个字节,因为这是UTF-8 (Python 3+)中单个字符所包含的最大字节数。对于键盘箭头等多字节字符,只读取一个字节将产生意想不到的结果。
下面是我修改后的Unix实现:
import contextlib
import os
import sys
import termios
import tty
_MAX_CHARACTER_BYTE_LENGTH = 4
@contextlib.contextmanager
def _tty_reset(file_descriptor):
"""
A context manager that saves the tty flags of a file descriptor upon
entering and restores them upon exiting.
"""
old_settings = termios.tcgetattr(file_descriptor)
try:
yield
finally:
termios.tcsetattr(file_descriptor, termios.TCSADRAIN, old_settings)
def get_character(file=sys.stdin):
"""
Read a single character from the given input stream (defaults to sys.stdin).
"""
file_descriptor = file.fileno()
with _tty_reset(file_descriptor):
tty.setcbreak(file_descriptor)
return os.read(file_descriptor, _MAX_CHARACTER_BYTE_LENGTH)
试试这个:http://home.wlu.edu/~levys/software/kbhit.py 它是非阻塞的(这意味着您可以有一个while循环并检测按键而无需停止它)和跨平台的。
import os
# Windows
if os.name == 'nt':
import msvcrt
# Posix (Linux, OS X)
else:
import sys
import termios
import atexit
from select import select
class KBHit:
def __init__(self):
'''Creates a KBHit object that you can call to do various keyboard things.'''
if os.name == 'nt':
pass
else:
# Save the terminal settings
self.fd = sys.stdin.fileno()
self.new_term = termios.tcgetattr(self.fd)
self.old_term = termios.tcgetattr(self.fd)
# New terminal setting unbuffered
self.new_term[3] = (self.new_term[3] & ~termios.ICANON & ~termios.ECHO)
termios.tcsetattr(self.fd, termios.TCSAFLUSH, self.new_term)
# Support normal-terminal reset at exit
atexit.register(self.set_normal_term)
def set_normal_term(self):
''' Resets to normal terminal. On Windows this is a no-op.
'''
if os.name == 'nt':
pass
else:
termios.tcsetattr(self.fd, termios.TCSAFLUSH, self.old_term)
def getch(self):
''' Returns a keyboard character after kbhit() has been called.
Should not be called in the same program as getarrow().
'''
s = ''
if os.name == 'nt':
return msvcrt.getch().decode('utf-8')
else:
return sys.stdin.read(1)
def getarrow(self):
''' Returns an arrow-key code after kbhit() has been called. Codes are
0 : up
1 : right
2 : down
3 : left
Should not be called in the same program as getch().
'''
if os.name == 'nt':
msvcrt.getch() # skip 0xE0
c = msvcrt.getch()
vals = [72, 77, 80, 75]
else:
c = sys.stdin.read(3)[2]
vals = [65, 67, 66, 68]
return vals.index(ord(c.decode('utf-8')))
def kbhit(self):
''' Returns True if keyboard character was hit, False otherwise.
'''
if os.name == 'nt':
return msvcrt.kbhit()
else:
dr,dw,de = select([sys.stdin], [], [], 0)
return dr != []
使用这个的例子:
import kbhit
kb = kbhit.KBHit()
while(True):
print("Key not pressed") #Do something
if kb.kbhit(): #If a key is pressed:
k_in = kb.getch() #Detect what key was pressed
print("You pressed ", k_in, "!") #Do something
kb.set_normal_term()
或者您可以使用PyPi中的getch模块。但是这会阻塞while循环
最简单的跨平台解决方案是sshkeyboard。使用pip安装sshkeyboard,
然后编写如下脚本:
from sshkeyboard import listen_keyboard
def press(key):
print(f"'{key}' pressed")
def release(key):
print(f"'{key}' released")
listen_keyboard(
on_press=press,
on_release=release,
)
它会打印:
'a' pressed
'a' released
当按下A键。默认按ESC键结束监听。
它需要比curses, tkinter和getch更少的编码。
这里回答:python中的raw_input,不按enter
使用这个代码-
from tkinter import Tk, Frame
def __set_key(e, root):
"""
e - event with attribute 'char', the released key
"""
global key_pressed
if e.char:
key_pressed = e.char
root.destroy()
def get_key(msg="Press any key ...", time_to_sleep=3):
"""
msg - set to empty string if you don't want to print anything
time_to_sleep - default 3 seconds
"""
global key_pressed
if msg:
print(msg)
key_pressed = None
root = Tk()
root.overrideredirect(True)
frame = Frame(root, width=0, height=0)
frame.bind("<KeyRelease>", lambda f: __set_key(f, root))
frame.pack()
root.focus_set()
frame.focus_set()
frame.focus_force() # doesn't work in a while loop without it
root.after(time_to_sleep * 1000, func=root.destroy)
root.mainloop()
root = None # just in case
return key_pressed
def __main():
c = None
while not c:
c = get_key("Choose your weapon ... ", 2)
print(c)
if __name__ == "__main__":
__main()
参考:https://github.com/unfor19/mg-tools/blob/master/mgtools/get_key_pressed.py
接受的答案对我来说并不是那么好(我按住一个键,什么都不会发生,然后我按下另一个键,它就会工作)。
在学习了curses模块之后,这似乎是正确的方法。现在它可以通过Windows -游标(通过pip可用)用于Windows,因此您可以以与平台无关的方式进行编程。下面这个例子是受YouTube上这个教程的启发:
import curses
def getkey(stdscr):
curses.curs_set(0)
while True:
key = stdscr.getch()
if key != -1:
break
return key
if __name__ == "__main__":
print(curses.wrapper(getkey))
以.py扩展名保存,或在交互模式下运行curses.wrapper(getkey)。