Python的一个报错——OSError: [Errno 22]

一个 Python 脚本有如下获取当前终端行列宽度的一行代码：

columns, rows = os.get_terminal_size()

大部分情况是正常的如：

./hubble_bench.py --help
hubble_bench.py

Usage:
    ./hubble_bench.py --issue_type=<issue_type>

Options:
    --issue_type=<issue_type> cpu_high_load, bufferpool_too_small, io_high_usage, net_high_usage, high_concurrency, slow_query, meta_lock, deadlock, large_uncommitted, seckill, connection_grow
    --thread_min=<thread_min>
    --thread_max=<thread_max>

但假如后面接管道就报错了：

./hubble_bench.py --help | less
Traceback (most recent call last):
  File "./hubble_bench.py", line 40, in <module>
    columns, rows = os.get_terminal_size()
OSError: [Errno 22] Invalid argument

后面发现改成用 shutil 来代替 os 模块就可以了:

columns, rows = shutil.get_terminal_size()
``