写入换行符而不创建新行

Question

我有一个程序需要向/tmp 目录写入一个小 bash 脚本，以提示输入凭据：

linux_prompt_script = (
    'printf "Proxy authentication failed.\n"'
    '\nread -s -p "Enter Password to try again: " mypassword'
    '\nprintf "Proxy authentication succeeded\n'
)

当我现在写它时，cat'ed 时看起来像这样：

printf "Proxy authentication failed.
"
read -s -p "Enter Password to try again: " mypassword
printf "Proxy authentication succeeded

这显然行不通。有没有办法可以在不创建新行的情况下写一个换行符\n，也可以写它来创建一个新行？

到目前为止我所拥有的：

linux_prompt_script = (
    'printf "Proxy authentication failed.\n"'
    '\nread -s -p "Enter Password to try again: " mypassword'
    '\nprintf "Proxy authentication succeeded\n'
)


def _prompt_linux():

    def _rand_filename(chars=string.ascii_letters):
        retval = set()
        for _ in range(0, 6):
            retval.add(random.choice(chars))
        return ''.join(list(retval))

    filename = _rand_filename()
    filepath = "/tmp/{}.sh".format(filename)
    while True:
        with open(filepath, "a+") as sh:
            sh.write(linux_prompt_script)

Answer 1

原始字符串在这里很有用。引号前的r 前缀表示一个原始字符串，它可以防止处理转义字符：

linux_prompt_script = r'''
printf "Proxy authentication failed.\n"
read -s -p "Enter Password to try again: " mypassword
printf "Proxy authentication succeeded"
'''

with open(filepath, "a+") as sh:
    sh.write(linux_prompt_script)

Answer 2

您可以将多行文本放在三引号内：

text='''
printf "Proxy authentication failed.
read -s -p "Enter Password to try again: " mypassword
printf "Proxy authentication succeeded
'''

所以你不必介意每一行末尾的\n。