diff --git a/pkgs/data/fonts/twitter-color-emoji/default.nix b/pkgs/data/fonts/twitter-color-emoji/default.nix
index 92c01b427e2d..a01b02bdfaf0 100644
--- a/pkgs/data/fonts/twitter-color-emoji/default.nix
+++ b/pkgs/data/fonts/twitter-color-emoji/default.nix
@@ -25,7 +25,7 @@ let
   };
 
   pythonEnv =
-    python3.withPackages (p: [ p.fonttools p.nototools ]);
+    python3.withPackages (ps: with ps; [ fonttools nototools ]);
 
 in
 stdenv.mkDerivation rec {
diff --git a/pkgs/development/python-modules/mypy-boto3-builder/default.nix b/pkgs/development/python-modules/mypy-boto3-builder/default.nix
index e46d8eab2bce..dc44c361a9ca 100644
--- a/pkgs/development/python-modules/mypy-boto3-builder/default.nix
+++ b/pkgs/development/python-modules/mypy-boto3-builder/default.nix
@@ -58,7 +58,7 @@ buildPythonPackage rec {
 
   meta = with lib; {
     description = "Type annotations builder for boto3";
-    homepage = "https://vemel.github.io/mypy_boto3_builder/";
+    homepage = "https://github.com/youtype/mypy_boto3_builder";
     license = with licenses; [ bsd3 ];
     maintainers = with maintainers; [ fab ];
   };
diff --git a/pkgs/development/python-modules/ptpython/default.nix b/pkgs/development/python-modules/ptpython/default.nix
index cfe65a24ece3..458cd14f7128 100644
--- a/pkgs/development/python-modules/ptpython/default.nix
+++ b/pkgs/development/python-modules/ptpython/default.nix
@@ -31,8 +31,8 @@ buildPythonPackage rec {
 
   meta = with lib; {
     description = "An advanced Python REPL";
+    homepage = "https://github.com/prompt-toolkit/ptpython";
     license = licenses.bsd3;
     maintainers = with maintainers; [ mlieberman85 ];
-    platforms = platforms.all;
   };
 }