Fix some LGTM alerts; Add LGTM badges to README.md (sonic-net#146)

LGTM tool is now active for the sonic-platform-common repo.

- Add LGTM badges to README.md
- Fix 26 LGTM alerts:
  - 17 for Unused import
  - 9 for Except block handles 'BaseException'

README.md

@@ -1,3 +1,6 @@
+[![Total alerts](https://img.shields.io/lgtm/alerts/g/Azure/sonic-platform-common.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/Azure/sonic-platform-common/alerts/)
+[![Language grade: Python](https://img.shields.io/lgtm/grade/python/g/Azure/sonic-platform-common.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/Azure/sonic-platform-common/context:python)
+
 # SONiC: Software for Open Networking in the Cloud
 
 ## sonic-platform-common

sonic_platform_base/sonic_eeprom/eeprom_base.py

@@ -10,18 +10,11 @@
 
 from __future__ import print_function
 
-try:
-    import exceptions              # Python 2
-except ImportError:
-    import builtins as exceptions  # Python 3
 try:
     import binascii
-    import optparse
     import os
     import io
-    import sys
     import struct
-    import subprocess
     import fcntl
 except ImportError as e:
     raise ImportError (str(e) + "- required module not found")
@@ -224,7 +217,7 @@ def open_eeprom(self):
             if os.path.isfile(self.cache_name):
                 eeprom_file = self.cache_name
                 using_eeprom = False
-        except:
+        except Exception:
             pass
         self.cache_update_needed = using_eeprom
         return io.open(eeprom_file, "rb")

sonic_platform_base/sonic_eeprom/eeprom_tlvinfo.py

@@ -11,15 +11,10 @@
 from __future__ import print_function
 
 try:
-    import exceptions              # Python 2
-except ImportError:
-    import builtins as exceptions  # Python 3
-try:
-    import binascii
-    import optparse
-    import os
     import sys
+
     import redis
+
     from . import eeprom_base    # Dot module supports both Python 2 and Python 3 using explicit relative import methods
 except ImportError as e:
     raise ImportError (str(e) + "- required module not found")

sonic_platform_base/sonic_sfp/bcmshell.py

@@ -116,7 +116,7 @@ def __del__(self):
 
         try:
             self.close()
-        except:
+        except Exception:
             pass
 
     #---------------
@@ -497,5 +497,5 @@ def __open__(self):
                 raise IOError("Socket error: unable to flush %s on open: %s" % (self.socketname, errstr))
             except IOError as e:
                 raise IOError("unable to flush %s on open: %s" % (self.socketname, e.message))
-            except:
+            except Exception:
                 raise IOError("unable to flush %s on open" % self.socketname)

sonic_platform_base/sonic_sfp/sff8436.py

@@ -9,7 +9,6 @@
     import struct
     import sys
     import time
-    import binascii
     import os
     import getopt
     import types

sonic_platform_base/sonic_sfp/sff8472.py

@@ -11,7 +11,6 @@
     import struct
     import sys
     import time
-    import binascii
     import os
     import getopt
     import types
@@ -530,7 +529,7 @@ def _get_calibration_type(self, eeprom_data):
                 return 2  # externally calibrated
             else:
                 return 0  # Could not find calibration type
-        except:
+        except Exception:
             return 0
 
     def __init__(self, eeprom_raw_data=None):

sonic_platform_base/sonic_sfp/sffbase.py

@@ -63,15 +63,15 @@ def test_bit(self, n, bitpos):
                 return 0
             else:
                 return 1
-        except:
+        except Exception:
             return -1
 
     def twos_comp(self, num, bits):
         try:
             if ((num & (1 << (bits - 1))) != 0):
                 num = num - (1 << bits)
             return num
-        except:
+        except Exception:
             return 0
 
     def mw_to_dbm(self, mW):

sonic_platform_base/sonic_sfp/sfputilbase.py

@@ -7,7 +7,6 @@
 
 try:
     import abc
-    import binascii
     import os
     import re
     import sys
@@ -18,7 +17,6 @@
     from sonic_py_common import device_info
     from sonic_py_common.interface import backplane_prefix
 
-    from . import bcmshell       # Dot module supports both Python 2 and Python 3 using explicit relative import methods
     from sonic_eeprom import eeprom_dts
     from .sff8472 import sff8472InterfaceId  # Dot module supports both Python 2 and Python 3 using explicit relative import methods
     from .sff8472 import sff8472Dom    # Dot module supports both Python 2 and Python 3 using explicit relative import methods
@@ -283,7 +281,7 @@ def _sfp_eeprom_present(self, sysfs_sfp_i2c_client_eeprompath, offset):
                     sysfsfile.read(1)
             except IOError:
                 return False
-            except:
+            except Exception:
                 return False
             else:
                 return True
@@ -342,7 +340,7 @@ def _read_eeprom_specific_bytes(self, sysfsfile_eeprom, offset, num_bytes):
         try:
             for n in range(0, num_bytes):
                 eeprom_raw[n] = hex(ord(raw[n]))[2:].zfill(2)
-        except:
+        except Exception:
             return None
 
         return eeprom_raw
@@ -364,7 +362,7 @@ def _read_eeprom_devid(self, port_num, devid, offset, num_bytes = 256):
 
         try:
             sysfsfile_eeprom.close()
-        except:
+        except Exception:
             return None
 
         return eeprom_raw
@@ -395,7 +393,7 @@ def _write_eeprom_devid(self, port_num, devid, offset, num_bytes, write_buffer):
 
         try:
             sysfsfile_eeprom.close()
-        except:
+        except Exception:
             return False
 
         return True
@@ -468,7 +466,7 @@ def read_porttab_mappings(self, porttabfile, asic_inst=0):
 
         try:
             f = open(porttabfile)
-        except:
+        except Exception:
             raise
 
         # Read the porttab file and generate dicts
@@ -571,7 +569,7 @@ def read_phytab_mappings(self, phytabfile):
 
         try:
             f = open(phytabfile)
-        except:
+        except Exception:
             raise
 
         # Read the phytab file and generate dicts

sonic_platform_base/sonic_sfp/sfputilhelper.py

@@ -6,8 +6,6 @@
 from __future__ import print_function
 
 try:
-    import abc
-    import binascii
     import os
     import re
     import sys
@@ -105,7 +103,7 @@ def read_porttab_mappings(self, porttabfile, asic_inst=0):
 
         try:
             f = open(porttabfile)
-        except:
+        except Exception:
             raise
 
         # Read the porttab file and generate dicts

sonic_platform_base/thermal_base.py

@@ -5,7 +5,6 @@
 # to interact with a thermal module in SONiC
 #
 
-import sys
 from . import device_base