Linting

Author: ChrisPaulBennett

cylc/flow/scripts/profiler.py

@@ -119,7 +119,8 @@ def parse_memory_file(process: Process):
                     if "total_rss" in line:
                         return int(''.join(filter(str.isdigit, line)))
     except Exception as err:
-        raise CylcProfilerError(err, "Unable to find memory usage data")
+        raise CylcProfilerError(
+            err, "Unable to find memory usage data") from err
 
 
 def parse_memory_allocated(process: Process) -> int:
@@ -155,7 +156,8 @@ def parse_cpu_file(process: Process) -> int:
             raise FileNotFoundError(process.cgroup_cpu_path)
 
     except Exception as err:
-        raise CylcProfilerError(err,"Unable to find cpu usage data")
+        raise CylcProfilerError(
+            err, "Unable to find cpu usage data") from err
 
 
 def get_cgroup_version(cgroup_location: str, cgroup_name: str) -> int:
@@ -168,7 +170,7 @@ def get_cgroup_version(cgroup_location: str, cgroup_name: str) -> int:
     except Exception as err:
         raise CylcProfilerError(
             err,
-            "Cgroup not found at " + cgroup_location + cgroup_name)
+            "Cgroup not found at " + cgroup_location + cgroup_name) from err
 
 
 def get_cgroup_name():
@@ -188,7 +190,8 @@ def get_cgroup_name():
         return result
 
     except Exception as err:
-        raise CylcProfilerError(err, '/proc/' + str(pid) + '/cgroup not found')
+        raise CylcProfilerError(
+            err, '/proc/' + str(pid) + '/cgroup not found') from err
 
 
 def get_cgroup_paths(location) -> Process:
@@ -217,8 +220,8 @@ def get_cgroup_paths(location) -> Process:
             )
         raise Exception
     except Exception as err:
-        raise CylcProfilerError(err, "Unable to determine cgroup version")
-
+        raise CylcProfilerError(
+            err, "Unable to determine cgroup version") from err
 
 
 def profile(_process: Process, delay, keep_looping=lambda: True):