BUG: lzma is a required part of python, make it optional

pandas/_libs/parsers.pyx

@@ -2,7 +2,6 @@
 # See LICENSE for the license
 import bz2
 import gzip
-import lzma
 import os
 import sys
 import time
@@ -59,9 +58,12 @@ from pandas.core.arrays import Categorical
 from pandas.core.dtypes.concat import union_categoricals
 import pandas.io.common as icom
 
+from pandas.compat import import_lzma
 from pandas.errors import (ParserError, DtypeWarning,
                            EmptyDataError, ParserWarning)
 
+lzma = import_lzma()
+
 # Import CParserError as alias of ParserError for backwards compatibility.
 # Ultimately, we want to remove this import. See gh-12665 and gh-14479.
 CParserError = ParserError

pandas/compat/__init__.py

@@ -65,3 +65,16 @@ def is_platform_mac():
 
 def is_platform_32bit():
     return struct.calcsize("P") * 8 < 64
+
+
+def import_lzma():
+    import warnings
+    try:
+        import lzma
+        return lzma
+    except ImportError:
+        msg = (
+            "Could not import the lzma module. Your installed Python is incomplete. "
+            "Attempting to use `lzma` compression will result in a RuntimeError."
+        )
+        warnings.warn(msg)

pandas/io/common.py

@@ -6,7 +6,6 @@
 import gzip
 from http.client import HTTPException  # noqa
 from io import BytesIO
-import lzma
 import mmap
 import os
 import pathlib
@@ -31,10 +30,13 @@
     ParserWarning,
 )
 
+from pandas.compat import import_lzma
 from pandas.core.dtypes.common import is_file_like
 
 from pandas._typing import FilePathOrBuffer
 
+lzma = import_lzma()
+
 # gh-12665: Alias for now and remove later.
 CParserError = ParserError
 

pandas/tests/io/test_pickle.py

@@ -13,7 +13,6 @@
 import bz2
 import glob
 import gzip
-import lzma
 import os
 import pickle
 import shutil
@@ -22,14 +21,16 @@
 
 import pytest
 
-from pandas.compat import is_platform_little_endian
+from pandas.compat import is_platform_little_endian, import_lzma
 
 import pandas as pd
 from pandas import Index
 import pandas.util.testing as tm
 
 from pandas.tseries.offsets import Day, MonthEnd
 
+lzma = import_lzma()
+
 
 @pytest.fixture(scope="module")
 def current_pickle_data():

pandas/util/testing.py

@@ -5,7 +5,6 @@
 from functools import wraps
 import gzip
 import http.client
-import lzma
 import os
 import re
 from shutil import rmtree
@@ -26,7 +25,7 @@
 )
 
 import pandas._libs.testing as _testing
-from pandas.compat import raise_with_traceback
+from pandas.compat import raise_with_traceback, import_lzma
 
 from pandas.core.dtypes.common import (
     is_bool,
@@ -70,6 +69,8 @@
 from pandas.io.common import urlopen
 from pandas.io.formats.printing import pprint_thing
 
+lzma = import_lzma()
+
 N = 30
 K = 4
 _RAISE_NETWORK_ERROR_DEFAULT = False
@@ -264,7 +265,7 @@ def write_to_compressed(compression, path, data, dest="test"):
 
         compress_method = bz2.BZ2File
     elif compression == "xz":
-        import lzma
+        lzma = import_lzma()
 
         compress_method = lzma.LZMAFile
     else: