sed/awk-like tool with Python language

 pyp, the Pyed Piper, is a command line tool for text manipulation. It
 is similar to awk and sed in functionality, but its subcommands are
 Python based, and thus more familiar to many programmers.
 .
 It can operate both on a per-line base and on the complete input
 stream. Different features can be pipelined in a single command by
 using the pipe character familiar from shell commands.
 .
 pyp backs up its input for reruns with modified commands, and can save
 commands as macros. On the downside, the rerun feature makes it
 unsuitable for continuous pipe operation.