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# Interface to Sage

This is an expect interface to another copy of the Sage interpreter.

class `sage.interfaces.sage0.``Sage`(logfile=None, preparse=True, python=False, init_code=None, server=None, server_tmpdir=None, remote_cleaner=True, **kwds)

  Bases: `sage.interfaces.expect.Expect`

  Expect interface to the Sage interpreter itself.

  INPUT:

  - `server` - (optional); if specified runs Sage on a remote machine with address. You must have ssh keys setup so you can login to the remote machine by typing “ssh remote_machine” and no password, call _install_hints_ssh() for hints on how to do that.

  The version of Sage should be the same as on the local machine, since pickling is used to move data between the two Sage process.

  EXAMPLES: We create an interface to a copy of Sage. This copy of Sage runs as an external process with its own memory space, etc.

      sage: s = Sage()

  Create the element 2 in our new copy of Sage, and cube it.

      sage: a = s(2)
      sage: a^3
      8

  Create a vector space of dimension \(4\), and compute its generators:

      sage: V = s('QQ^4')
      sage: V.gens()
      ((1, 0, 0, 0), (0, 1, 0, 0), (0, 0, 1, 0), (0, 0, 0, 1))

  Note that V is a not a vector space, it’s a wrapper around an object (which happens to be a vector space), in another running instance of Sage.

      sage: type(V)
      <class 'sage.interfaces.sage0.SageElement'>
      sage: V.parent()
      Sage
      sage: g = V.0;  g
      (1, 0, 0, 0)
      sage: g.parent()
      Sage

  We can still get the actual parent by using the name attribute of g, which is the variable name of the object in the child process.

      sage: s('%s.parent()'%g.name())
      Vector space of dimension 4 over Rational Field

  Note that the memory space is completely different.

      sage: x = 10
      sage: s('x = 5')
      5
      sage: x
      10
      sage: s('x')
      5

  We can have the child interpreter itself make another child Sage process, so now three copies of Sage are running:

      sage: s3 = s('Sage()')
      sage: a = s3(10)
      sage: a
      10

  This \(a=10\) is in a subprocess of a subprocesses of your original Sage.

      sage: _ = s.eval('%s.eval("x=8")'%s3.name())
      sage: s3('"x"')
      8
      sage: s('x')
      5
      sage: x
      10

  The double quotes are needed because the call to s3 first evaluates its arguments using the s interpreter, so the call to s3 is passed `s('"x"')`, which is the string `"x"` in the s interpreter.

  `clear`(var)

    Clear the variable named var.

    Note that the exact format of the NameError for a cleared variable is slightly platform dependent, see trac #10539.

    EXAMPLES:

        sage: sage0.set('x', '2')
        sage: sage0.get('x')
        '2'
        sage: sage0.clear('x')
        sage: 'NameError' in sage0.get('x')
        True

  `console`()

    Spawn a new Sage command-line session.

    EXAMPLES:

        sage: sage0.console() #not tested
        ----------------------------------------------------------------------
        | Sage Version ..., Release Date: ...                                |
        | Type notebook() for the GUI, and license() for information.        |
        ----------------------------------------------------------------------
        ...

  `cputime`(t=None)

    Return cputime since this Sage subprocess was started.

    EXAMPLES:

        sage: sage0.cputime()     # random output
        1.3530439999999999
        sage: sage0('factor(2^157-1)')
        852133201 * 60726444167 * 1654058017289 * 2134387368610417
        sage: sage0.cputime()     # random output
        1.6462939999999999

  `eval`(line, strip=True, **kwds)

    Send the code x to a second instance of the Sage interpreter and return the output as a string.

    This allows you to run two completely independent copies of Sage at the same time in a unified way.

    INPUT:

    - `line` - input line of code
    - `strip` - ignored

    EXAMPLES:

        sage: sage0.eval('2+2')
        '4'

  `get`(var)

    Get the value of the variable var.

    EXAMPLES:

        sage: sage0.set('x', '2')
        sage: sage0.get('x')
        '2'

  `new`(x)

    EXAMPLES:

        sage: sage0.new(2)
        2
        sage: _.parent()
        Sage

  `preparse`(x)

    Returns the preparsed version of the string s.

    EXAMPLES:

        sage: sage0.preparse('2+2')
        'Integer(2)+Integer(2)'

  `quit`(verbose=False)

    EXAMPLES:

        sage: s = Sage()
        sage: s.eval('2+2')
        '4'
        sage: s.quit()

  `set`(var, value)

    Set the variable var to the given value.

    EXAMPLES:

        sage: sage0.set('x', '2')
        sage: sage0.get('x')
        '2'

  `trait_names`()

    EXAMPLES:

        sage: t = sage0.trait_names()
        sage: len(t) > 100
        True
        sage: 'gcd' in t
        True

  `version`()

    EXAMPLES:

        sage: sage0.version()
        'Sage Version ..., Release Date: ...'
        sage: sage0.version() == version()
        True

class `sage.interfaces.sage0.``SageElement`(parent, value, is_name=False, name=None)

  Bases: `sage.interfaces.expect.ExpectElement`

class `sage.interfaces.sage0.``SageFunction`(obj, name)

  Bases: `sage.interfaces.expect.FunctionElement`

`sage.interfaces.sage0.``reduce_load_Sage`()

  EXAMPLES:

      sage: from sage.interfaces.sage0 import reduce_load_Sage
      sage: reduce_load_Sage()
      Sage

`sage.interfaces.sage0.``reduce_load_element`(s)

  EXAMPLES:

      sage: from sage.interfaces.sage0 import reduce_load_element
      sage: s = dumps(1/2)
      sage: half = reduce_load_element(s); half
      1/2
      sage: half.parent()
      Sage

`sage.interfaces.sage0.``sage0_console`()

  Spawn a new Sage command-line session.

  EXAMPLES:

      sage: sage0_console() #not tested
      ----------------------------------------------------------------------
      | Sage Version ..., Release Date: ...                                |
      | Type notebook() for the GUI, and license() for information.        |
      ----------------------------------------------------------------------
      ...

`sage.interfaces.sage0.``sage0_version`()

  EXAMPLES:

      sage: from sage.interfaces.sage0 import sage0_version
      sage: sage0_version() == version()
      True

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