MAINT: Added Chain exceptions where appropriate (#18394)

* Added chain exception in _bits_of func

* Added chain exception

* Added chain exception in unixccompiler.py

* Added chain exception in config.py

* Added chain exception in fcompiler __init__.py

* Added chain exception in compaq.py

* Added chain exception in format.py

* Updated raise chain exception

* STY: Break long line.

Co-authored-by: Charles Harris <charlesr.harris@gmail.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/numpy/lib/format.py b/numpy/lib/format.py
index 5d951e262..ac5f75fba 100644
--- a/numpy/lib/format.py
+++ b/numpy/lib/format.py
@@ -378,7 +378,7 @@ def _wrap_header(header, version):
         header_prefix = magic(*version) + struct.pack(fmt, hlen + padlen)
     except struct.error:
         msg = "Header length {} too big for version={}".format(hlen, version)
-        raise ValueError(msg)
+        raise ValueError(msg) from None
 
     # Pad the header with spaces and a final newline such that the magic
     # string, the header-length short and the header are aligned on a
@@ -595,7 +595,7 @@ def _read_array_header(fp, version):
         d = safe_eval(header)
     except SyntaxError as e:
         msg = "Cannot parse header: {!r}\nException: {!r}"
-        raise ValueError(msg.format(header, e))
+        raise ValueError(msg.format(header, e)) from None
     if not isinstance(d, dict):
         msg = "Header is not a dictionary: {!r}"
         raise ValueError(msg.format(d))
@@ -614,9 +614,9 @@ def _read_array_header(fp, version):
         raise ValueError(msg.format(d['fortran_order']))
     try:
         dtype = descr_to_dtype(d['descr'])
-    except TypeError:
+    except TypeError as e:
         msg = "descr is not a valid dtype descriptor: {!r}"
-        raise ValueError(msg.format(d['descr']))
+        raise ValueError(msg.format(d['descr'])) from e
 
     return d['shape'], d['fortran_order'], dtype