change to suitable raise from and add line breaks #2

numpy/random/_common.pyx

@@ -121,7 +121,7 @@ cdef object prepare_cffi(bitgen_t *bitgen):
     """
     try:
         import cffi
-    except ImportError:
+    except ImportError as e:
         raise ImportError('cffi cannot be imported.') from e
 
     ffi = cffi.FFI()

tools/cythonize.py

@@ -58,12 +58,12 @@ def process_pyx(fromfile, tofile):
         # try the cython in the installed python first (somewhat related to scipy/scipy#2397)
         import Cython
         from Cython.Compiler.Version import version as cython_version
-    except ImportError:
+    except ImportError as e:
         # The `cython` command need not point to the version installed in the
         # Python running this script, so raise an error to avoid the chance of
         # using the wrong version of Cython.
-        raise OSError("Cython needs to be installed in "
-                "Python as a module") from e
+        msg = 'Cython needs to be installed in Python as a module'
+        raise OSError(msg) from e
     else:
         # check the version, and invoke through python
         from distutils.version import LooseVersion