CLN: misc cleanups from LGTM (pandas-dev#33724)

Author: simonjayhawkins

pandas/_testing.py

@@ -279,16 +279,10 @@ def write_to_compressed(compression, path, data, dest="test"):
     ValueError : An invalid compression value was passed in.
     """
     if compression == "zip":
-        import zipfile
-
         compress_method = zipfile.ZipFile
     elif compression == "gzip":
-        import gzip
-
         compress_method = gzip.GzipFile
     elif compression == "bz2":
-        import bz2
-
         compress_method = bz2.BZ2File
     elif compression == "xz":
         compress_method = _get_lzma_file(lzma)

pandas/core/series.py

@@ -275,7 +275,6 @@ def __init__(
                         "Cannot construct a Series from an ndarray with "
                         "compound dtype.  Use DataFrame instead."
                     )
-                pass
             elif isinstance(data, ABCSeries):
                 if index is None:
                     index = data.index