CLN: Replace bare excepts by explicit excepts in pandas/io/ (#23004)

Author: JustinZhengBC

pandas/io/clipboards.py

@@ -42,7 +42,7 @@ def read_clipboard(sep=r'\s+', **kwargs):  # pragma: no cover
                 text, encoding=(kwargs.get('encoding') or
                                 get_option('display.encoding'))
             )
-        except:
+        except AttributeError:
             pass
 
     # Excel copies into clipboard with \t separation

pandas/io/formats/console.py

@@ -100,7 +100,7 @@ def check_main():
 
     try:
         return __IPYTHON__ or check_main()  # noqa
-    except:
+    except NameError:
         return check_main()
 
 
@@ -118,7 +118,7 @@ def in_qtconsole():
             ip.config.get('IPKernelApp', {}).get('parent_appname', ""))
         if 'qtconsole' in front_end.lower():
             return True
-    except:
+    except NameError:
         return False
     return False
 
@@ -137,7 +137,7 @@ def in_ipnb():
             ip.config.get('IPKernelApp', {}).get('parent_appname', ""))
         if 'notebook' in front_end.lower():
             return True
-    except:
+    except NameError:
         return False
     return False
 
@@ -149,7 +149,7 @@ def in_ipython_frontend():
     try:
         ip = get_ipython()  # noqa
         return 'zmq' in str(type(ip)).lower()
-    except:
+    except NameError:
         pass
 
     return False

pandas/io/formats/terminal.py

@@ -78,7 +78,7 @@ def _get_terminal_size_windows():
         h = windll.kernel32.GetStdHandle(-12)
         csbi = create_string_buffer(22)
         res = windll.kernel32.GetConsoleScreenBufferInfo(h, csbi)
-    except:
+    except (AttributeError, ValueError):
         return None
     if res:
         import struct
@@ -108,7 +108,7 @@ def _get_terminal_size_tput():
         output = proc.communicate(input=None)
         rows = int(output[0])
         return (cols, rows)
-    except:
+    except OSError:
         return None
 
 
@@ -120,7 +120,7 @@ def ioctl_GWINSZ(fd):
             import struct
             cr = struct.unpack(
                 'hh', fcntl.ioctl(fd, termios.TIOCGWINSZ, '1234'))
-        except:
+        except (struct.error, IOError):
             return None
         return cr
     cr = ioctl_GWINSZ(0) or ioctl_GWINSZ(1) or ioctl_GWINSZ(2)
@@ -129,13 +129,13 @@ def ioctl_GWINSZ(fd):
             fd = os.open(os.ctermid(), os.O_RDONLY)
             cr = ioctl_GWINSZ(fd)
             os.close(fd)
-        except:
+        except OSError:
             pass
     if not cr or cr == (0, 0):
         try:
             from os import environ as env
             cr = (env['LINES'], env['COLUMNS'])
-        except:
+        except (ValueError, KeyError):
             return None
     return int(cr[1]), int(cr[0])
 

pandas/io/packers.py

@@ -196,7 +196,7 @@ def read(fh):
         if should_close:
             try:
                 path_or_buf.close()
-            except:  # noqa: flake8
+            except IOError:
                 pass
         return unpacked_obj
 
@@ -705,7 +705,7 @@ def create_block(b):
             dtype = dtype_for(obj[u'dtype'])
             try:
                 return dtype(obj[u'data'])
-            except:
+            except (ValueError, TypeError):
                 return dtype.type(obj[u'data'])
     elif typ == u'np_complex':
         return complex(obj[u'real'] + u'+' + obj[u'imag'] + u'j')

pandas/io/parsers.py

@@ -459,7 +459,7 @@ def _read(filepath_or_buffer, kwds):
     if should_close:
         try:
             filepath_or_buffer.close()
-        except:  # noqa: flake8
+        except ValueError:
             pass
 
     return data
@@ -1808,7 +1808,7 @@ def close(self):
         # close additional handles opened by C parser (for compression)
         try:
             self._reader.close()
-        except:
+        except ValueError:
             pass
 
     def _set_noconvert_columns(self):
@@ -3034,7 +3034,7 @@ def converter(*date_cols):
                     errors='ignore',
                     infer_datetime_format=infer_datetime_format
                 )
-            except:
+            except ValueError:
                 return tools.to_datetime(
                     parsing.try_parse_dates(strs, dayfirst=dayfirst))
         else:
@@ -3263,7 +3263,7 @@ def _floatify_na_values(na_values):
             v = float(v)
             if not np.isnan(v):
                 result.add(v)
-        except:
+        except (TypeError, ValueError, OverflowError):
             pass
     return result
 
@@ -3284,11 +3284,11 @@ def _stringify_na_values(na_values):
                 result.append(str(v))
 
             result.append(v)
-        except:
+        except (TypeError, ValueError, OverflowError):
             pass
         try:
             result.append(int(x))
-        except:
+        except (TypeError, ValueError, OverflowError):
             pass
     return set(result)
 

pandas/io/pickle.py

@@ -163,18 +163,20 @@ def try_read(path, encoding=None):
                 # We want to silence any warnings about, e.g. moved modules.
                 warnings.simplefilter("ignore", Warning)
                 return read_wrapper(lambda f: pkl.load(f))
-        except Exception:
+        except Exception:  # noqa: E722
             # reg/patched pickle
+            # compat not used in pandas/compat/pickle_compat.py::load
+            # TODO: remove except block OR modify pc.load to use compat
             try:
                 return read_wrapper(
                     lambda f: pc.load(f, encoding=encoding, compat=False))
             # compat pickle
-            except:
+            except Exception:  # noqa: E722
                 return read_wrapper(
                     lambda f: pc.load(f, encoding=encoding, compat=True))
     try:
         return try_read(path)
-    except:
+    except Exception:  # noqa: E722
         if PY3:
             return try_read(path, encoding='latin1')
         raise

pandas/io/sas/sas_xport.py

@@ -246,7 +246,7 @@ def __init__(self, filepath_or_buffer, index=None, encoding='ISO-8859-1',
             contents = filepath_or_buffer.read()
             try:
                 contents = contents.encode(self._encoding)
-            except:
+            except UnicodeEncodeError:
                 pass
             self.filepath_or_buffer = compat.BytesIO(contents)
 

pandas/io/sas/sasreader.py

@@ -46,7 +46,7 @@ def read_sas(filepath_or_buffer, format=None, index=None, encoding=None,
                 format = "sas7bdat"
             else:
                 raise ValueError("unable to infer format of SAS file")
-        except:
+        except ValueError:
             pass
 
     if format.lower() == 'xport':

pandas/io/sql.py

@@ -382,7 +382,7 @@ def read_sql(sql, con, index_col=None, coerce_float=True, params=None,
 
     try:
         _is_table_name = pandas_sql.has_table(sql)
-    except:
+    except (ImportError, AttributeError):
         _is_table_name = False
 
     if _is_table_name:
@@ -847,7 +847,7 @@ def _sqlalchemy_type(self, col):
             try:
                 tz = col.tzinfo  # noqa
                 return DateTime(timezone=True)
-            except:
+            except AttributeError:
                 return DateTime
         if col_type == 'timedelta64':
             warnings.warn("the 'timedelta' type is not supported, and will be "
@@ -1360,7 +1360,7 @@ def run_transaction(self):
         try:
             yield cur
             self.con.commit()
-        except:
+        except Exception:
             self.con.rollback()
             raise
         finally:

pandas/io/stata.py

@@ -1252,12 +1252,12 @@ def _read_old_header(self, first_char):
 
         try:
             self.typlist = [self.TYPE_MAP[typ] for typ in typlist]
-        except:
+        except ValueError:
             raise ValueError("cannot convert stata types [{0}]"
                              .format(','.join(str(x) for x in typlist)))
         try:
             self.dtyplist = [self.DTYPE_MAP[typ] for typ in typlist]
-        except:
+        except ValueError:
             raise ValueError("cannot convert stata dtypes [{0}]"
                              .format(','.join(str(x) for x in typlist)))