Pexpect 将 '/r/n' 插入 sendline()

问题描述

我正在使用 pexpect 在 Ubuntu 20.04 上的 zsh 终端中自动运行 C 程序。 有问题的程序是一个频谱转换器:http://www.np.ph.bham.ac.uk/research_resources/programs/spec_conv/spec_conv.c

我已经安装并在我的路径中。我无法在终端中运行“spec_conv”并且程序运行正常。

当程序启动时,有一组初始选项 (0-9)。我需要选择 5。第二个选项我单击“Y”。然后程序要求输入文件名。我有一个名为“file_list”的文件,我将它输入到终端中,光谱按预期处理。

我正在尝试使用 python 自动执行此操作。到目前为止,我的代码是:

import pexpect
child = pexpect.spawn('spec_conv')
child.sendline('5')
child.sendline('y')
child.sendline('file_list')
print(child.read())

代码似乎无法读取文件print(child.read())输出是:

b'\r\n \t \t    *****Welcome to SPEC_CONV*****\r\n\tThis program converts spectra between RadWare,Ascii,\r\n\tXtrack (GASPWARE) and Ortec (binary Chn & ASCII Spe) formats,\r\n\tincluding multiple-spectra (<999) Xtrack files,e.g. from AGATA.\r\n\tand can gainmatch spectra.\r\n\t(Ascii means (y) or (x y) data starting from channel zero)\r\n\tComment lines starting with # are ignored at the front of\r\n\tascii spectra. The 1 or 2 col. format is auto-detected.\r\n\r\n 1) to convert RadWare (.spe) ==> Ascii (.txt)\r\n 2) to convert Ascii (.txt) ==> RadWare (.spe)\r\n 3) to convert Ascii (.txt) ==> Xtrack (.spec)\r\n 4) to convert Maestro_Chn (.Chn) ==> Ascii (.txt)\r\n 5) to convert Maestro_Chn (.Chn) ==> RadWare (.spe)\r\n 6) to convert Xtrack (.spec) ==> Ascii (.txt)\r\n 7) to convert Xtrack (.spec) ==> RadWare (.spe)\r\n 8) to convert GENIE (.IEC) ==> RadWare (.spe)\r\n 9) to convert Maestro_Spe (.Spe) ==> RadWare (.spe)\r\n a) to convert Maestro_Spe (.Spe) ==> Ascii (.txt)\r\n g) to gainmatch a RadWare spectrum\r\n 0) Quit\r\n5^J\r\nRead spectrum names from list file (y/n) \r\ny^J\r\nType filename containing list of spectrum file names:\r\nCannot open file:  \r\nfile_list\r\n'

正如您在此摘录的最后所见,它将文件名读取为“\r\nfile_list\r\n”,因此找不到该文件。我已经尝试了其他类似问题中提出的几个解决方案,但这些都没有奏效:

https://github.com/pexpect/pexpect/issues/238 Preventing linewrap when using pexpect / bash

添加 setwinsize:

import pexpect
child = pexpect.spawn('spec_conv')
child.setwinsize(1000,1000)
child.sendline('5')
child.sendline('y')
child.sendline('file_list')
print(child.read())

输出是一样的。

我还尝试按照建议添加“--noediting”来更改我的 .spawn() 输入:

import pexpect
child = pexpect.spawn('spec_conv --noediting')
child.setwinsize(1000,1000)
child.sendline('5')
child.sendline('y')
child.sendline('file_list')
print(child.read())

这给出了我不完全理解原因的早期失败输出

b'\r\n \t \t     *****Welcome to SPEC_CONV*****\r\n\tThis program converts spectra between RadWare,e.g. from AGATA.\r\n\tand can gainmatch spectra.\r\n\t(Ascii means (y) or (x y) data starting from channel zero)\r\n\tComment lines starting with # are ignored at the front of\r\n\tascii spectra. The 1 or 2 col. format is auto-detected.\r\n\r\n\r\nUnrecognised arguments...usage: spec_conv\r\n or: spec_conv SpectrumFileName\r\n ***File --noediting does not exist\r\n5\r\ny\r\nfile_list\r\n'

解决方法

如果您手动运行生成的程序,您应该能够看到,当您回复 y/n 问题时,您只需键入 y 即可立即获得答案,无需回车。

因此您需要发送单个字符,而不是使用 sendline() 向发送的字符串添加换行符。替换

child.sendline('y')

child.send('y')