unify python major version bytes/str handling; close #146

pypiper/manager.py

@@ -477,7 +477,7 @@ def start_pipeline(self, args=None, multi=False):
             print("* " + "Pypiper hash".rjust(20) + ":  " + str(gitvars['pypiper_hash']))
             print("* " + "Pypiper branch".rjust(20) + ":  " + str(gitvars['pypiper_branch']))
             print("* " + "Pypiper date".rjust(20) + ":  " + str(gitvars['pypiper_date']))
-            if "" != str(gitvars['pypiper_diff'].decode()):
+            if gitvars['pypiper_diff']:
                 print("* " + "Pypiper diff".rjust(20) + ":  " + str(gitvars['pypiper_diff']))
         except KeyError:
             # It is ok if keys aren't set, it means pypiper isn't in a  git repo.
@@ -1922,9 +1922,8 @@ def _memory_usage(self, pid='self', category="hwm", container=None):
             # TODO: Put some debug output here with switch to Logger
             # since this is relatively untested.
             cmd = "docker stats " + container + " --format '{{.MemUsage}}' --no-stream"
-            mem_use_str = subprocess.check_output(cmd, shell=True).decode().print()
-            mem_use = mem_use_str.split("/")[0].split()
-
+            mem_use_str = subprocess.check_output(cmd, shell=True).decode()
+
             mem_num = re.findall('[\d\.]+', mem_use_str.split("/")[0])[0]
             mem_scale = re.findall('[A-Za-z]+', mem_use_str.split("/")[0])[0]