<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _safe_type(value):
 """Converts Python type names to XGMML-safe type names."""


    if type(value) is str: dtype = 'string'
    if type(value) is unicode: dtype = 'string'
    if type(value) is int: dtype = 'integer'
    if type(value) is float: dtype = 'real'

    return dtype