autotest: fix execution of commands on Windows with backslashes

autotest/pymod/gdaltest.py

@@ -1912,7 +1912,10 @@ def runexternal(
     encoding="latin1",
 ):
     # pylint: disable=unused-argument
-    command = shlex.split(cmd)
+    if sys.platform == "win32":
+        command = cmd
+    else:
+        command = shlex.split(cmd)
     if strin is None:
         p = subprocess.Popen(command, stdout=subprocess.PIPE)
     else:
@@ -1949,7 +1952,10 @@ def _read_in_thread(f, q):
 
 def runexternal_out_and_err(cmd, check_memleak=True, encoding="ascii"):
     # pylint: disable=unused-argument
-    command = shlex.split(cmd)
+    if sys.platform == "win32":
+        command = cmd
+    else:
+        command = shlex.split(cmd)
     p = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
 
     if p.stdout is not None:

autotest/pyscripts/test_gdal_edit.py

@@ -173,7 +173,9 @@ def test_gdal_edit_py_3(script_path):
     shutil.copy(test_py_scripts.get_data_path("gcore") + "byte.tif", filename)
 
     try:
-        test_py_scripts.run_py_script(script_path, "gdal_edit", filename + " -a_srs ''")
+        test_py_scripts.run_py_script(
+            script_path, "gdal_edit", filename + " -a_srs None"
+        )
 
         ds = gdal.Open(filename)
         wkt = ds.GetProjectionRef()

autotest/utilities/test_gdal_rasterize.py

@@ -395,12 +395,11 @@ def test_gdal_rasterize_7(gdal_rasterize_path, sql_in_file):
     else:
         sql = '"' + sql + '"'
     cmds = (
-        """tmp/test_gdal_rasterize_7.csv
-              tmp/test_gdal_rasterize_7.tif
-              -init 0 -burn 1
-              -sql %s
-              -dialect sqlite -tr 1 1 -te -1 -1 51 51"""
-        % sql
+        "tmp/test_gdal_rasterize_7.csv "
+        + "tmp/test_gdal_rasterize_7.tif "
+        + "-init 0 -burn 1 "
+        + f"-sql {sql} "
+        + "-dialect sqlite -tr 1 1 -te -1 -1 51 51"
     )
 
     gdaltest.runexternal(gdal_rasterize_path + " " + cmds)