Optimizer controls in Python

The reference documentation for xpress.problem.setControl() says:

setControl(...)
    Purpose: 
    Sets one or more controls of a problem.
    
    Synopsis:
    
    problem.setControl(string, value)
    
    Example: 
    p = xpress.problem()
    p.setControl('miprelstop', 1e-4)
    p.setControl({'feastol': 1e-4, 'presolve': 0})
    
    Further information:
    ...
    2.  
    This function can be used in two ways depending on whether one wants
    to set one or more controls. In the first case, the arguments form a
    pair (string, value) where the first element is the lower-case name of
    a control (see the Xpress Optimizer reference manual for a complete
    list of controls). In the second case, the argument is a Python
    dictionary whose keys are control name string and whose values
    are the value of the control.

So the names of controls used in the Python interface are the lower-case names (without the XPRS_ prefix).

The same naming convention applies when referring to controls as object members.

This is explained in the user manual here and here.

Thank you, Daniel!

Slightly unrelated... Is there a control that suppresses _all_ log messages from the solvers?

Also, the statement that removing "XPRS_" and switching to lowercase does the job doesn't seem to be correct. The statement:

model.setControl('verbose',False)

returns an error: 

InterfaceError: Incorrect control name

The function to globally disable Xpress output in Python is xpress.setOutputEnabled(False). "verbose" is not a public solver control. XPRS_VERBOSE is a convenience thing only defined in Mosel.

Thank you, Daniel! This helps.