Lazily import compileall (#226)

* Lazily import compileall

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

CONTRIBUTING.md

@@ -17,8 +17,8 @@ check if there is an existing issue already filed for the same, in the project's
 GitHub [issue tracker]. If not, please file a new issue.
 
 If you want to help out by fixing bugs, choose an open issue in the [issue
-tracker] to work on and claim it by posting a comment saying "I would like to
-work on this.". Feel free to ask any doubts in the issue thread.
+tracker] to work on and claim it by posting a comment saying "I would like to work
+on this.". Feel free to ask any doubts in the issue thread.
 
 While working on implementing the feature, please go ahead and file a pull
 request. Filing a pull request early allows for getting feedback as early as

src/installer/destinations.py

@@ -1,6 +1,5 @@
 """Handles all file writing and post-installation processing."""
 
-import compileall
 import io
 import os
 from pathlib import Path
@@ -243,6 +242,8 @@ def _compile_bytecode(self, scheme: Scheme, record: RecordEntry) -> None:
         if scheme not in ("purelib", "platlib"):
             return
 
+        import compileall
+
         target_path = self._path_with_destdir(scheme, record.path)
         dir_path_to_embed = os.path.dirname(  # Without destdir
             os.path.join(self.scheme_dict[scheme], record.path)