eval with print stmt

[Art]

Hello,

I can't seem to get eval or compile to accept the print stmt, or any
complicated statements.

The documentation I've looked out doesn't explain why this is.

ex:
>>> eval("print('foo')")
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "<string>", line 1
    print('foo')

but this works:
>>> eval('sys.__stdout__.write("foo\\n")')
foo

also, I can't get eval to make callable objects. is this possible?
>>> eval("def foo():\n    return 'foo'")
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "<string>", line 1
    def foo():
      ^
SyntaxError: invalid syntax

I'd like to have a command line parameter be turned into a callable
statement with an expected environment (a la awk) but I can't seem to
get this working. (I get the same behavior for compile.

Thanks,
A