This is not a duplicate of subprocess.Popen: 'OSError: [Errno 13] Permission denied' only on Linux as that problem occurred due to wrong permissions. That has been fixed and this is an entirely different problem.

When my code (given below) executes on Windows (both my laptop and AppVeyor CI), it does what it's supposed to do. But on Linux (VM on TravisCI), it throws me a file not found error.

I am executing in /home/travis/build/sayak-brm/espeak4py/.

ls -l outputs:

$ ls -l
total 48
-rw-rw-r-- 1 travis travis   500 Sep 29 20:14 appveyor.yml
drwxrwxr-x 3 travis travis  4096 Sep 29 20:14 espeak4py
-rw-rw-r-- 1 travis travis 32400 Sep 29 20:14 LICENSE.md
-rw-rw-r-- 1 travis travis  2298 Sep 29 20:14 README.md
-rw-rw-r-- 1 travis travis     0 Sep 29 20:14 requirements.txt
-rw-rw-r-- 1 travis travis   759 Sep 29 20:14 test.py$ ls -l espeak4py
total 592
-rwxr-xr-x 1 travis travis 276306 Sep 30 06:42 espeak
drwxrwxr-x 5 travis travis   4096 Sep 29 20:14 espeak-data
-rw-rw-r-- 1 travis travis 319488 Sep 29 20:14 espeak.exe
-rw-rw-r-- 1 travis travis   1125 Sep 29 20:14 __init__.py$ ls -l /home/travis/build/sayak-brm/espeak4py/espeak4py
total 592
-rwxr-xr-x 1 travis travis 276306 Sep 30 06:42 espeak
drwxrwxr-x 5 travis travis   4096 Sep 30 06:42 espeak-data
-rw-rw-r-- 1 travis travis 319488 Sep 30 06:42 espeak.exe
-rw-rw-r-- 1 travis travis   1216 Sep 30 06:42 __init__.py

which shows that the files are where they are supposed to be.

The espeak file is a Linux ELF Binary.

Error:

$ python3 test.py
Testing espeak4py
Testing wait4prev
Traceback (most recent call last):File "test.py", line 10, in <module>mySpeaker.say('Hello, World!')File "/home/travis/build/sayak-brm/espeak4py/espeak4py/__init__.py", line 38, in sayself.prevproc = subprocess.Popen(cmd, executable=self.executable, cwd=os.path.dirname(os.path.abspath(__file__)))File "/opt/python/3.2.6/lib/python3.2/subprocess.py", line 744, in __init__restore_signals, start_new_session)File "/opt/python/3.2.6/lib/python3.2/subprocess.py", line 1394, in _execute_childraise child_exception_type(errno_num, err_msg)
OSError: [Errno 2] No such file or directory: '/home/travis/build/sayak-brm/espeak4py/espeak4py/espeak'

Code:

espeak4py/__init__.py:

#! python3
import subprocess
import os
import platformclass Speaker:"""Speaker class for differentiating different speech properties."""def __init__(self, voice="en", wpm=120, pitch=80):self.prevproc = Noneself.voice = voiceself.wpm = wpmself.pitch = pitchif platform.system() == 'Windows': self.executable = os.path.dirname(os.path.abspath(__file__)) + "/espeak.exe"else: self.executable = os.path.dirname(os.path.abspath(__file__)) + "/espeak"def generateCommand(self, phrase):cmd = [self.executable,"--path=.","-v", self.voice,"-p", self.pitch,"-s", self.wpm,phrase]cmd = [str(x) for x in cmd]return cmddef say(self, phrase, wait4prev=False):cmd=self.generateCommand(phrase)if wait4prev:try: self.prevproc.wait()except AttributeError: passelse:try: self.prevproc.terminate()except AttributeError: passself.prevproc = subprocess.Popen(cmd, executable=self.executable, cwd=os.path.dirname(os.path.abspath(__file__)))

test.py:

#! python3
import espeak4py
import timeprint('Testing espeak4py\n')
print('Testing wait4prev')mySpeaker = espeak4py.Speaker()mySpeaker.say('Hello, World!')
time.sleep(1)
mySpeaker.say('Interrupted!')
time.sleep(3)mySpeaker.say('Hello, World!')
time.sleep(1)
mySpeaker.say('Not Interrupted.', wait4prev=True)
time.sleep(5)print('Testing pitch')myHighPitchedSpeaker = espeak4py.Speaker(pitch=120)
myHighPitchedSpeaker.say('I am a demo of the say function')
time.sleep(5)print('Testing wpm')myFastSpeaker = espeak4py.Speaker(wpm=140)
myFastSpeaker.say('I am a demo of the say function')
time.sleep(5)print('Testing voice')mySpanishSpeaker = espeak4py.Speaker(voice='es')
mySpanishSpeaker.say('Hola. Como estas?')print('Testing Completed.')

I don't understand why it works only on one platform and not the other.

Travis CI Logs: https://travis-ci.org/sayak-brm/espeak4py

AppVeyor Logs: https://ci.appveyor.com/project/sayak-brm/espeak4py

GitHub: https://sayak-brm.github.io/espeak4py

I've tested your espeak Python wrapper on Linux, and it works for me. Probably it's just an issue with Windows trailing \r characters. You could try the following:

sed -i 's/^M//' espeak4py/__init__.py

To enter the ^M, type Ctrl-V followed by Ctrl-M, and see if running that sed command solves the issue.