[Enhancement] Support to find Cython path more automatically (#418)

* Support to find Cython path more automatically

* lint fix

---------
Co-authored-by: LeiWang1999 <leiwang1999@outlook.com>

tilelang/jit/adapter/cython/adapter.py

@@ -23,6 +23,7 @@ import os
 import fcntl
 from pathlib import Path
 import logging
+import site
 
 logger = logging.getLogger(__name__)
 
@@ -37,7 +38,23 @@ def get_cython_compiler() -> Optional[str]:
     """
 
     cython_names = ["cython", "cython3"]
-    dirs_in_path = os.get_exec_path()
+
+    # Check system PATH
+    dirs_in_path = list(os.get_exec_path())
+
+    # Add user site-packages bin directory
+    user_base = site.getuserbase()
+    if user_base:
+        user_bin = os.path.join(user_base, "bin")
+        if os.path.exists(user_bin):
+            dirs_in_path = [user_bin] + dirs_in_path
+
+    # If in a virtual environment, add its bin directory
+    if sys.prefix != sys.base_prefix:
+        venv_bin = os.path.join(sys.prefix, "bin")
+        if os.path.exists(venv_bin):
+            dirs_in_path = [venv_bin] + dirs_in_path
+
     for cython_name in cython_names:
         for d in dirs_in_path:
             cython_path = os.path.join(d, cython_name)