Misc fixes on Python tools (#2136)

Misc fixes on Python tools
diff --git a/tools/fileslower.py b/tools/fileslower.py
index 0515242..219a94a 100755
--- a/tools/fileslower.py
+++ b/tools/fileslower.py
@@ -205,7 +205,7 @@
 try:
     b.attach_kprobe(event="__vfs_write", fn_name="trace_write_entry")
     b.attach_kretprobe(event="__vfs_write", fn_name="trace_write_return")
-except:
+except Exception:
     # older kernels don't have __vfs_write so try vfs_write instead
     b.attach_kprobe(event="vfs_write", fn_name="trace_write_entry")
     b.attach_kretprobe(event="vfs_write", fn_name="trace_write_return")