按文件名打开类文件对象

Question

我想创建一个类似文件的对象，稍后将按其文件名打开。有可能做到吗？我在找这样的东西：

import io
fileLikeObject = io.BytesIO()
fileLikeObject.write((b"randomContent")
fileLikeObject.name = "someFilename.txt"
sameFileAsbefore = open("someFilename.txt", "rb")
sameFileAsbefore.read()

我看了这个线程，但之后无法访问该文件的名称。

为了完整起见，我想具体做的是生成一个正弦波形并在Android环境中播放。这是根据这个答案改编的代码。

from kivy.core.audio import SoundLoader
from kivy.base import runTouchApp
from kivy.uix.button import Button
import time

# Wave parameters
fs = 44100 # sampling frequency
duration = 2 # seconds
# Generating waveforms
timePoints = np.linspace(0, duration, duration*fs)
sineWave = np.sin(2 * np.pi * 440 * timePoints) # 440 Hz
outdata = np.transpose(np.tile(volume*outputWave, (2,1)))
class MyLabel(Button):
def on_release(self):
start_time = time.time()
self.play_sound()
print("--- %s seconds ---" % (time.time() - start_time))
def play_sound(self):
bytes_out = io.BytesIO()
wavfile.write(bytes_out, fs, outdata)
bytes_out.seek(0)
sound = SoundLoader.load(bytes_out) # only loads by filename :/
sound.seek(0)
if sound:
print("Sound found at %s" % sound.source)
print("Sound is %.3f seconds" % sound.length)
sound.play()
runTouchApp(MyLabel(text="Press me for a sound"))

我也对其他允许我在Android上播放机器生成声音的解决方案持开放态度。谢谢你的帮助！

Answer 1

俗话说"过早优化是万恶之源"，对吧？

根据@fins的评论，我创建了临时文件来使用库tempfile存储音频。当文件关闭时，它会自动销毁该文件。

以下是我在问题中发布的工作版本：

from kivy.core.audio import SoundLoader
from kivy.base import runTouchApp
from kivy.uix.button import Button
from scipy.io import wavfile
import time
import tempfile
import numpy as np
# Wave parameters
fs = 44100 # sampling frequency
duration = 2 # seconds
# Generating waveforms
timePoints = np.linspace(0, duration, duration*fs)
sineWave = np.sin(2 * np.pi * 440 * timePoints) # 440 Hz
outdata = np.transpose(np.tile(sineWave, (2,1)))
class MyLabel(Button):
def on_release(self):
start_time = time.time()
self.play_sound()
print("--- %s seconds ---" % (time.time() - start_time))
def play_sound(self):
f = tempfile.NamedTemporaryFile(suffix = '.wav', delete=True)
wavfile.write(f, fs, outdata)
f.seek(0)
sound = SoundLoader.load(f.name)
if sound:
print("Sound found at %s" % sound.source)
print("Sound is %.3f seconds" % sound.length)
sound.play()
f.close()
runTouchApp(MyLabel(text="Press me for a sound"))