Vekyization challenge

Can you write a program with the following properties?

1. Takes a string describing a python program as input.
2. Outputs another string also describing a python program.
3. The two programs are equivalent, i.e. they behave in the same way.
4. The output doesn't contain a newline character, i.e. it's a one-liner.
5. The length of the output is at most a constant times the length of the input.
6. The runtime of the output is at most a constant times the runtime of the input.
7. If the input doesn't contain eval-like constructs, the output doesn't either.