refactor hasattr() checks as global constants

psutil/_psbsd.py

@@ -103,6 +103,11 @@
     PAGESIZE = os.sysconf("SC_PAGE_SIZE")
 AF_LINK = cext_posix.AF_LINK
 
+HAS_PER_CPU_TIMES = hasattr(cext, "per_cpu_times")
+HAS_PROC_NUM_THREADS = hasattr(cext, "proc_num_threads")
+HAS_PROC_OPEN_FILES = hasattr(cext, 'proc_open_files')
+HAS_PROC_NUM_FDS = hasattr(cext, 'proc_num_fds')
+
 kinfo_proc_map = dict(
     ppid=0,
     status=1,
@@ -211,7 +216,7 @@ def cpu_times():
     return scputimes(user, nice, system, idle, irq)
 
 
-if hasattr(cext, "per_cpu_times"):
+if HAS_PER_CPU_TIMES:
     def per_cpu_times():
         """Return system CPU times as a namedtuple"""
         ret = []
@@ -678,7 +683,7 @@ def create_time(self):
 
     @wrap_exceptions
     def num_threads(self):
-        if hasattr(cext, "proc_num_threads"):
+        if HAS_PROC_NUM_THREADS:
             # FreeBSD
             return cext.proc_num_threads(self.pid)
         else:
@@ -798,7 +803,7 @@ def cwd(self):
         elif NETBSD:
             with wrap_exceptions_procfs(self):
                 return os.readlink("/proc/%s/cwd" % self.pid)
-        elif hasattr(cext, 'proc_open_files'):
+        elif HAS_PROC_OPEN_FILES:
             # FreeBSD < 8 does not support functions based on
             # kinfo_getfile() and kinfo_getvmmap()
             return cext.proc_cwd(self.pid) or None
@@ -817,7 +822,7 @@ def _not_implemented(self):
 
     # FreeBSD < 8 does not support functions based on kinfo_getfile()
     # and kinfo_getvmmap()
-    if hasattr(cext, 'proc_open_files'):
+    if HAS_PROC_OPEN_FILES:
         @wrap_exceptions
         def open_files(self):
             """Return files opened by process as a list of namedtuples."""
@@ -828,7 +833,7 @@ def open_files(self):
 
     # FreeBSD < 8 does not support functions based on kinfo_getfile()
     # and kinfo_getvmmap()
-    if hasattr(cext, 'proc_num_fds'):
+    if HAS_PROC_NUM_FDS:
         @wrap_exceptions
         def num_fds(self):
             """Return the number of file descriptors opened by this process."""

psutil/_pslinux.py

@@ -73,6 +73,7 @@
 POWER_SUPPLY_PATH = "/sys/class/power_supply"
 HAS_SMAPS = os.path.exists('/proc/%s/smaps' % os.getpid())
 HAS_PRLIMIT = hasattr(cext, "linux_prlimit")
+HAS_PROC_IO_PRIORITY = hasattr(cext, "proc_ioprio_get")
 _DEFAULT = object()
 
 # RLIMIT_* constants, not guaranteed to be present on all kernels
@@ -1928,7 +1929,7 @@ def cpu_affinity_set(self, cpus):
             raise
 
     # only starting from kernel 2.6.13
-    if hasattr(cext, "proc_ioprio_get"):
+    if HAS_PROC_IO_PRIORITY:
 
         @wrap_exceptions
         def ionice_get(self):
@@ -1971,6 +1972,7 @@ def ionice_set(self, ioclass, value):
             return cext.proc_ioprio_set(self.pid, ioclass, value)
 
     if HAS_PRLIMIT:
+
         @wrap_exceptions
         def rlimit(self, resource, limits=None):
             # If pid is 0 prlimit() applies to the calling process and

psutil/_pswindows.py

@@ -83,6 +83,7 @@
                                   cext.ERROR_ACCESS_DENIED])
 NO_SUCH_SERVICE_ERRSET = frozenset([cext.ERROR_INVALID_NAME,
                                     cext.ERROR_SERVICE_DOES_NOT_EXIST])
+HAS_PROC_IO_PRIORITY = hasattr(cext, "proc_io_priority_get")
 
 
 if enum is None:
@@ -928,7 +929,7 @@ def nice_set(self, value):
         return cext.proc_priority_set(self.pid, value)
 
     # available on Windows >= Vista
-    if hasattr(cext, "proc_io_priority_get"):
+    if HAS_PROC_IO_PRIORITY:
         @wrap_exceptions
         def ionice_get(self):
             return cext.proc_io_priority_get(self.pid)