Pip ensure absent command ! not found

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Hello

When setting a pip absent I get following:

Could not evaluate: Could not find command '!'

This prob happens because bash is not used as a shell. I resolved this by changing the unless command to.

https://github.com/voxpupuli/puppet-python/blob/master/manifests/pip.pp line 223 $unless_command = "echo '! ${pip_env} list | grep -i -e \'${grep_regex}\'' | bash"