WAV文件转频谱图遇FileNotFoundError：问题求助与解决

我正在开发首个将WAV文件转换为频谱图的项目，使用某仓库的preprocessing.py代码时出现报错，无法解决。具体报错信息如下：

Traceback (most recent call last):
  File "preprocessing.py", line 54, in <module>
    create_spectrogram(filename,name, train_data_path)
  File "preprocessing.py", line 42, in create_spectrogram
    plt.savefig(filename, dpi=400, bbox_inches='tight', pad_inches=0)
  File "C:\Users\tien chelsea\PycharmProjects\lam lai nhan dang spectogram\venv\lib\site-packages\matplotlib\pyplot.py", line 977, in savefig
    res = fig.savefig(*args, **kwargs)
  File "C:\Users\tien chelsea\PycharmProjects\lam lai nhan dang spectogram\venv\lib\site-packages\matplotlib\figure.py", line 3058, in savefig
    self.canvas.print_figure(fname, **kwargs)
  File "C:\Users\tien chelsea\PycharmProjects\lam lai nhan dang spectogram\venv\lib\site-packages\matplotlib\backend_bases.py", line 2325, in print_figure
    **kwargs)
  File "C:\Users\tien chelsea\PycharmProjects\lam lai nhan dang spectogram\venv\lib\site-packages\matplotlib\backend_bases.py", line 1648, in wrapper
    return func(*args, **kwargs)
  File "C:\Users\tien chelsea\PycharmProjects\lam lai nhan dang spectogram\venv\lib\site-packages\matplotlib\_api\deprecation.py", line 415, in wrapper
    return func(*inner_args, **inner_kwargs)
  File "C:\Users\tien chelsea\PycharmProjects\lam lai nhan dang spectogram\venv\lib\site-packages\matplotlib\backends\backend_agg.py", line 543, in print_png
    dpi=self.figure.dpi, metadata=metadata, pil_kwargs=pil_kwargs)
  File "C:\Users\tien chelsea\PycharmProjects\lam lai nhan dang spectogram\venv\lib\site-packages\matplotlib\image.py", line 1675, in imsave
    image.save(fname, **pil_kwargs)
  File "C:\Users\tien chelsea\PycharmProjects\lam lai nhan dang spectogram\venv\lib\site-packages\PIL\Image.py", line 2350, in save
    fp = builtins.open(filename, "w+b")
FileNotFoundError: [Errno 2] No such file or directory: 'data/train/train\\100032-3-0-0.png'

问题分析 #

报错核心是路径错误：生成的目标路径data/train/train\\100032-3-0-0.png存在两个问题：

1. 重复了train目录，导致系统找不到该层级目录；
2. 混合使用了正斜杠/和反斜杠\，跨平台路径处理不规范。

解决方案 #

1. 修正路径重复问题
   检查代码中train_data_path的定义，确认它是否已经包含/train后缀。如果train_data_path是data/train，那么拼接文件名时无需再添加train，否则会出现data/train/train的错误路径。

2. 用os.path规范路径拼接
   使用Python内置的os.path模块处理路径，自动适配不同系统的分隔符，避免手动拼接出错：

import os

# 替换原路径拼接逻辑，用os.path.join组合目录和文件名
save_filename = os.path.join(train_data_path, f"{name}.png")
plt.savefig(save_filename, dpi=400, bbox_inches='tight', pad_inches=0)

3. 确保目标目录存在
   在保存图片前，先检查并创建目标目录，防止因目录不存在导致报错：

import os

save_filename = os.path.join(train_data_path, f"{name}.png")
# 获取文件所在的目录路径
save_dir = os.path.dirname(save_filename)
# 创建目录（如果不存在），exist_ok=True避免目录已存在时抛出异常
os.makedirs(save_dir, exist_ok=True)
plt.savefig(save_filename, dpi=400, bbox_inches='tight', pad_inches=0)

内容的提问来源于stack exchange，提问作者Luckie One