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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def taql(command, style='Python', tables=[], globals={}, locals={}):
 """Execute a TaQL command and return a table object. A `TaQL <../../doc/199.html>`_ command is an SQL-like command to do a selection of rows and/or columns in a table. The default style used in a TaQL command is python, which means 0-based indexing, C-ordered arrays, and non-inclusive end in ranges. It is possible to use python variables directly in the command using `$var` where `var` is the name of the variable to use. For example:: t = table('3c343.MS') value = 5.1 t1 = taql('select from $t where COL > $value') In this example the table `$t` is replaced by a sequence number (such as `$1`) and `$value` by its value 5.1. The table object of `t` will be appended to a copy of the `tables` argument such that the sequence number inserted matches the table object in the list. The more advanced user can already use `$n` in the query string and supply the associated table object in the `tables` argument (where `n` represents the (n-1)th `tables` element). The :func:`query` command makes use of this feature. The arguments `globals` and `locals` can be used to pass in a dict containing the possible variables used in the TaQL command. They can be obtained with the python functions locals() and globals(). If `locals` is empty, the local variables in the calling function will be used, so normally one does not need to use these arguments. """

    # Substitute possible tables given as $name.
    cmd = command
    # Copy the tables argument and make sure it is a list
    tabs = []
    for tab in tables:
        tabs += [tab]
    try:
        import casacore.util
        if len(locals) == 0:
            # local variables in caller are 3 levels up from getlocals
            locals = casacore.util.getlocals(3)
        cmd = casacore.util.substitute(cmd, [(table, '', tabs)],
                                       globals, locals)
    except Exception:
        pass
    if style:
        cmd = 'using style ' + style + ' ' + cmd
    tab = table(cmd, tabs, _oper=2)
    result = tab._getcalcresult()
    # If result is empty, it was a normal TaQL command resulting in a table.
    # Otherwise it is a record containing calc values.
    if len(result) == 0:
        return tab
    return result['values']