use stdlib.has_python for uniformity/clarity

this also avoids a case where Python is only partially working.
This happens if an incompatible or broken Python version is specified
to pyenv(Version=)

Author: scivision

+stdlib/cpu_load.m

@@ -24,8 +24,9 @@
     case 'java'
       i = stdlib.java.cpu_load();
     case 'python'
-      if stdlib.matlabOlderThan('R2022a'), continue, end
-      i = stdlib.python.cpu_load();
+      if stdlib.has_python()
+        i = stdlib.python.cpu_load();
+      end
     case 'sys'
       i = stdlib.sys.cpu_load();
     otherwise

+stdlib/create_symlink.m

@@ -24,8 +24,9 @@
     case 'dotnet'
       i = stdlib.dotnet.create_symlink(target, link);
     case 'python'
-      if stdlib.matlabOlderThan('R2022a'), continue, end
-      i = stdlib.python.create_symlink(target, link);
+      if stdlib.has_python()
+        i = stdlib.python.create_symlink(target, link);
+      end
     case 'sys'
       i = stdlib.sys.create_symlink(target, link);
     otherwise

+stdlib/device.m

@@ -22,8 +22,9 @@
     case 'java'
       i = stdlib.java.device(file);
     case 'python'
-      if stdlib.matlabOlderThan('R2022a'), continue, end
-      i = stdlib.python.device(file);
+      if stdlib.has_python()
+        i = stdlib.python.device(file);
+      end
     case 'sys'
       i = stdlib.sys.device(file);
     otherwise

+stdlib/disk_available.m

@@ -27,8 +27,9 @@
     case 'java'
       i = stdlib.java.disk_available(file);
     case 'python'
-      if stdlib.matlabOlderThan('R2022a'), continue, end
-      i = stdlib.python.disk_available(file);
+      if stdlib.has_python()
+        i = stdlib.python.disk_available(file);
+      end
     case 'sys'
       i = stdlib.sys.disk_available(file);
     otherwise

+stdlib/disk_capacity.m

@@ -25,8 +25,9 @@
     case 'java'
       i = stdlib.java.disk_capacity(file);
     case 'python'
-      if stdlib.matlabOlderThan('R2022a'), continue, end
-      i = stdlib.python.disk_capacity(file);
+      if stdlib.has_python()
+        i = stdlib.python.disk_capacity(file);
+      end
     case 'sys'
       i = stdlib.sys.disk_capacity(file);
     otherwise

+stdlib/filesystem_type.m

@@ -26,8 +26,9 @@
     case 'dotnet'
       r = stdlib.dotnet.filesystem_type(file);
     case 'python'
-      if stdlib.matlabOlderThan('R2022a'), continue, end
-      r = stdlib.python.filesystem_type(file);
+      if stdlib.has_python()
+        r = stdlib.python.filesystem_type(file);
+      end
     case 'sys'
       r = stdlib.sys.filesystem_type(file);
     otherwise

+stdlib/get_owner.m

@@ -24,8 +24,9 @@
     case 'dotnet'
       r = stdlib.dotnet.get_owner(file);
     case 'python'
-      if stdlib.matlabOlderThan('R2022a'), continue, end
-      r = stdlib.python.get_owner(file);
+      if stdlib.has_python()
+        r = stdlib.python.get_owner(file);
+      end
     case 'sys'
       r = stdlib.sys.get_owner(file);
     otherwise

+stdlib/get_process_priority.m

@@ -24,8 +24,9 @@
     case 'dotnet'
       i = stdlib.dotnet.get_process_priority();
     case 'python'
-      if stdlib.matlabOlderThan('R2022a'), continue, end
-      i = stdlib.python.get_process_priority();
+      if stdlib.has_python()
+        i = stdlib.python.get_process_priority();
+      end
     case 'sys'
       i = stdlib.sys.get_process_priority();
     otherwise

+stdlib/get_uid.m

@@ -21,8 +21,9 @@
     case 'dotnet'
       i = stdlib.dotnet.get_uid();
     case 'python'
-      if stdlib.matlabOlderThan('R2022a'), continue, end
-      i = stdlib.python.get_uid();
+      if stdlib.has_python()
+        i = stdlib.python.get_uid();
+      end
     case 'perl'
       i = stdlib.perl.get_uid();
     otherwise

+stdlib/get_username.m

@@ -23,8 +23,9 @@
     case 'dotnet'
       r = stdlib.dotnet.get_username();
     case 'python'
-      if stdlib.matlabOlderThan('R2022a'), continue, end
-      r = stdlib.python.get_username();
+      if stdlib.has_python()
+        r = stdlib.python.get_username();
+      end
     case 'sys'
       r = stdlib.sys.get_username();
     otherwise