ModuleNotFoundError: No module named '_lzma'

🐛 Bug

Importing the latest version of torchvision==0.8.1 throws following error:

  File "tor-example.py", line 2, in <module>
    import torchvision
  File "/home/zoran/MyProjects/mindsdb-examples/tor/lib/python3.7/site-packages/torchvision/__init__.py", line 7, in <module>
    from torchvision import datasets
  File "/home/zoran/MyProjects/mindsdb-examples/tor/lib/python3.7/site-packages/torchvision/datasets/__init__.py", line 6, in <module>
    from .mnist import MNIST, EMNIST, FashionMNIST, KMNIST, QMNIST
  File "/home/zoran/MyProjects/mindsdb-examples/tor/lib/python3.7/site-packages/torchvision/datasets/mnist.py", line 11, in <module>
    import lzma
  File "/usr/local/lib/python3.7/lzma.py", line 27, in <module>
    from _lzma import *
ModuleNotFoundError: No module named '_lzma'

To Reproduce

Steps to reproduce the behavior:

1. pip install torchvision
2. import torchvision

Environment

CUDA used to build PyTorch: 10.2
ROCM used to build PyTorch: N/A

OS: Ubuntu 19.10 (x86_64)
GCC version: (Ubuntu 9.2.1-9ubuntu2) 9.2.1 20191008
Clang version: Could not collect
CMake version: version 3.13.4

Python version: 3.7 (64-bit runtime)
Is CUDA available: False
CUDA runtime version: No CUDA
GPU models and configuration: No CUDA
Nvidia driver version: No CUDA
cuDNN version: No CUDA
HIP runtime version: N/A
MIOpen runtime version: N/A

Versions of relevant libraries:
[pip3] numpy==1.19.2
[pip3] torch==1.7.0
[pip3] torchvision==0.8.1
[conda] Could not collect

• PyTorch / torchvision Version (1.7.0 / 0.8.1):
• OS : Linux Ubuntu
• How you installed PyTorch / torchvision (conda, pip, source): pip
• Python version: 3.7.3

cc @pmeier

[rvorias]

Hi, I came across this issue after installing python from source. It seems that I installed python without liblzma-dev. After installing liblzma-dev and installing python again, the import error was gone.

[INF800]

Thus issue occurs in 3.10 but not in 3.7 for me.