为了检测控制台是否正确
sys.stderrsys.stdoutif hasattr(sys.stderr, "isatty") and sys.stderr.isatty():
if platform.system()=='Windows':
# win code (ANSI not supported but there are alternatives)
else:
# use ANSI escapes
else:
# no colors, usually this is when you redirect the output to a file
现在，通过 IDE（如 PyCharm）运行此 Python 代码时，问题变得更加复杂。最近 PyCharm 添加了对 ANSI 的支持，但第一次测试失败了：它具有
isattyFalse我想修改逻辑，以便正确检测输出是否支持 ANSI 着色。一个要求是，在任何情况下，当输出被重定向到一个文件时，我都不应该输出一些东西（对于控制台来说，这是可以接受的）。
Django 用户可以使用
django.core.management.color.supports_colorif supports_color():
...
他们使用的代码是：
def supports_color():
"""
Returns True if the running system's terminal supports color, and False
otherwise.
"""
plat = sys.platform
supported_platform = plat != 'Pocket PC' and (plat != 'win32' or
'ANSICON' in os.environ)
# isatty is not always implemented, #6223.
is_a_tty = hasattr(sys.stdout, 'isatty') and sys.stdout.isatty()
return supported_platform and is_a_tty
参见https://github.com/django/django/blob/master/django/core/management/color.py
我可以告诉你其他人是如何解决这个问题的，但它并不漂亮。如果您以 ncurses 为例（它需要能够在各种不同的终端上运行），您会看到它们使用 terminal capabilities database 来存储各种终端及其功能。关键是，即使是他们也永远无法自动“检测”到这些东西。
我不知道是否有跨平台的 termcap，但它可能值得您花时间寻找它。即使它在那里，它也可能没有列出您的终端，您可能必须手动添加它。
\x1B[6n\x1B[{line};{column}Rmsvcrt.getchmsvcrt.kbhit警告：我（不建议）没有测试这个特定的 tty/select/termios 代码，但知道过去可以使用类似的代码。
getchkbhittty.setrawselect.selectfrom termios import TCSADRAIN, tcgetattr, tcsetattr
from select import select
from tty import setraw
from sys import stdin
def getch() -> bytes:
fd = stdin.fileno() # get file descriptor of stdin
old_settings = tcgetattr(fd) # save settings (important!)
try: # setraw accomplishes a few things,
setraw(fd) # such as disabling echo and wait.
return stdin.read(1).encode() # consistency with the Windows func
finally: # means output should be in bytes
tcsetattr(fd, TCSADRAIN, old_settings) # finally, undo setraw (important!)
def kbhit() -> bool: # select.select checks if fds are
return bool(select([stdin], [], [], 0)[0]) # ready for reading/writing/error
这可以与下面的代码一起使用。
from sys import stdin, stdout
def isansitty() -> bool:
"""
The response to \x1B[6n should be \x1B[{line};{column}R according to
https://gist.github.com/fnky/458719343aabd01cfb17a3a4f7296797. If this
doesn't work, then it is unlikely ANSI escape codes are supported.
"""
while kbhit(): # clear stdin before sending escape in
getch() # case user accidentally presses a key
stdout.write("\x1B[6n") # alt: print(end="\x1b[6n", flush=True)
stdout.flush() # double-buffered stdout needs flush
stdin.flush() # flush stdin to make sure escape works
if kbhit(): # ANSI won't work if stdin is empty
if ord(getch()) == 27 and kbhit(): # check that response starts with \x1B[
if getch() == b"[":
while kbhit(): # read stdin again, to remove the actual
getch() # value returned by the escape
return stdout.isatty() # lastly, if stdout is a tty, ANSI works
# so True should be returned. Otherwise,
return False # return False
如果你想要它，这里是原始代码。
from sys import stdin, stdout
from platform import system
if system() == "Windows":
from msvcrt import getch, kbhit
else:
from termios import TCSADRAIN, tcgetattr, tcsetattr
from select import select
from tty import setraw
from sys import stdin
def getch() -> bytes:
fd = stdin.fileno()
old_settings = tcgetattr(fd)
try:
setraw(fd)
return stdin.read(1).encode()
finally:
tcsetattr(fd, TCSADRAIN, old_settings)
def kbhit() -> bool:
return bool(select([stdin], [], [], 0)[0])
def isansitty() -> bool:
"""
Checks if stdout supports ANSI escape codes and is a tty.
"""
while kbhit():
getch()
stdout.write("\x1b[6n")
stdout.flush()
stdin.flush()
if kbhit():
if ord(getch()) == 27 and kbhit():
if getch() == b"[":
while kbhit():
getch()
return stdout.isatty()
return False
排名不分先后：