job: add billable_tres attribute (#344)

Author: tazend

pyslurm/core/job/job.pxd

@@ -308,6 +308,8 @@ cdef class Job:
             Maximum CPU-Frequency requested.
         cpu_frequency_governor (Union[str, int]):
             CPU-Frequency Governor requested.
+        billable_tres (float):
+            Amount of billable trackable resources.
         wckey (str):
             Name of the WCKey this Job uses.
         mail_user (list):

pyslurm/core/job/job.pyx

@@ -984,6 +984,13 @@ cdef class Job:
     #       # TODO: Find out how it works
     #       return cstr.to_unicode(self.ptr.tres_freq)
 
+    @property
+    def billable_tres(self):
+        if self.ptr.billable_tres == <double>slurm.NO_VAL:
+            return 0.0
+
+        return self.ptr.billable_tres
+
     @property
     def wckey(self):
         return cstr.to_unicode(self.ptr.wckey)