do not generate log file by default

csst_common/data_manager.py

@@ -83,7 +83,7 @@ class CsstMsDataManager:
         Use "pml" for Purple Mountain Lab cluster and "local" for others.
     dfs_root : str
         The DFS root path.
-    obs_id : int
+    obs_id : str
         The exposure ID.
     exp_start : int
         The exposure start time in ``yyyymmddhhmmss`` format.
@@ -152,8 +152,8 @@ class CsstMsDataManager:
                  _survey: str = "MS",
                  obs_type: str = "SCI",
                  l0_post: str = "L0_1",
-                 log_ppl="csst-l1ppl.log",
-                 log_mod="csst-l1mod.log",
+                 log_ppl=None,
+                 log_mod=None,
                  clear_dir=False,
                  verbose=True,
                  n_jobs=18,
@@ -231,10 +231,12 @@ class CsstMsDataManager:
             self.clear_dir(self.dir_l1)
 
         # pipeline logger
+        if log_ppl is not None:
             self.logger_ppl = get_logger(name="CSST L1 Pipeline Logger", filename=os.path.join(dir_l1, log_ppl))
             if verbose:
                 self.logger_ppl.info("logger_ppl initialized")
         # module logger
+        if log_mod is not None:
             self.logger_mod = get_logger(name="CSST L1 Module Logger", filename=os.path.join(dir_l1, log_mod))
             if verbose:
                 self.logger_mod.info("logger_mod initialized")