pipes
ossaudiodev — 访问 OSS (开放声音系统) 兼容音频设备
ossaudiodev
源代码： Lib/pipes.py
Deprecated since version 3.11, will be removed in version 3.13: The pipes 模块被弃用 (见 PEP 594 for details). Please use the subprocess 模块代替。
subprocess
The pipes module defines a class to abstract the concept of a pipeline — a sequence of converters from one file to another.
Because the module uses /bin/sh command lines, a POSIX or compatible shell for os.system() and os.popen() 被要求。
os.system()
os.popen()
可用性 : Unix, not VxWorks.
The pipes 模块定义了下列类：
An abstraction of a pipeline.
范例：
>>> import pipes >>> t = pipes.Template() >>> t.append('tr a-z A-Z', '--') >>> f = t.open('pipefile', 'w') >>> f.write('hello world') >>> f.close() >>> open('pipefile').read() 'HELLO WORLD'
Template objects following methods:
Restore a pipeline template to its initial state.
Return a new, equivalent, pipeline template.
若 flag is true, turn debugging on. Otherwise, turn debugging off. When debugging is on, commands to be executed are printed, and the shell is given set -x command to be more verbose.
set -x
Append a new action at the end. The cmd variable must be a valid bourne shell command. The kind variable consists of two letters.
The first letter can be either of '-' (which means the command reads its standard input), 'f' (which means the commands reads a given file on the command line) or '.' (which means the commands reads no input, and hence must be first.)
'-'
'f'
'.'
Similarly, the second letter can be either of '-' (which means the command writes to standard output), 'f' (which means the command writes a file on the command line) or '.' (which means the command does not write anything, and hence must be last.)
Add a new action at the beginning. See append() for explanations of the arguments.
append()
Return a file-like object, open to file , but read from or written to by the pipeline. Note that only one of 'r' , 'w' may be given.
'r'
'w'
拷贝 infile to outfile through the pipe.
sndhdr — 确定声音文件类型
sndhdr
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