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I always thought that subprocess is replacing all other methods of executing external programs from Python and it is a preferred way. Perhaps I was not attentive that people isolate:
 os.system
 os.spawn*
 os.popen*
and
 os.exec*
While subprocess replaces three first, it doesn't do this with the last one. The documentation should mention this in the header block. Proposed edit:
 ...
 replace several other, older modules and functions, such as:
 os.system
 os.spawn*
 os.popen*
 popen2.*
 commands.*
+ Note that it doesn't replace other ways of executing external
+ processes from Python, such as:
+
+ os.exec*
 Information about how the subprocess module can be used
 ...