diff --git a/pkgs/development/interpreters/python/cpython/2.6/default.nix b/pkgs/development/interpreters/python/cpython/2.6/default.nix
index 5311be697afea0..2d81773aeb069c 100644
--- a/pkgs/development/interpreters/python/cpython/2.6/default.nix
+++ b/pkgs/development/interpreters/python/cpython/2.6/default.nix
@@ -8,10 +8,14 @@ with stdenv.lib;
 
 let
   majorVersion = "2.6";
-  version = "${majorVersion}.9";
+  minorVersion = "9";
+  minorVersionSuffix = "";
+  pythonVersion = majorVersion;
+  version = "${majorVersion}.${minorVersion}${minorVersionSuffix}";
+  libPrefix = "python${majorVersion}";
 
   src = fetchurl {
-    url = "http://www.python.org/ftp/python/${version}/Python-${version}.tar.xz";
+    url = "https://www.python.org/ftp/python/${majorVersion}.${minorVersion}/Python-${version}.tar.xz";
     sha256 = "0hbfs2691b60c7arbysbzr0w9528d5pl8a4x7mq5psh6a2cvprya";
   };
 
@@ -94,12 +98,12 @@ let
       '';
 
     passthru = rec {
+      inherit libPrefix;
       inherit zlibSupport;
       isPy2 = true;
       isPy26 = true;
       buildEnv = callPackage ../../wrapper.nix { python = self; };
       withPackages = import ../../with-packages.nix { inherit buildEnv; pythonPackages = python26Packages; };
-      libPrefix = "python${majorVersion}";
       executable = libPrefix;
       sitePackages = "lib/${libPrefix}/site-packages";
       interpreter = "${self}/bin/${executable}";
diff --git a/pkgs/development/interpreters/python/cpython/2.7/default.nix b/pkgs/development/interpreters/python/cpython/2.7/default.nix
index 5c61b9777c85d5..77c6a3f06ce7e5 100644
--- a/pkgs/development/interpreters/python/cpython/2.7/default.nix
+++ b/pkgs/development/interpreters/python/cpython/2.7/default.nix
@@ -22,10 +22,14 @@ with stdenv.lib;
 
 let
   majorVersion = "2.7";
-  version = "${majorVersion}.12";
+  minorVersion = "12";
+  minorVersionSuffix = "";
+  pythonVersion = majorVersion;
+  version = "${majorVersion}.${minorVersion}${minorVersionSuffix}";
+  libPrefix = "python${majorVersion}";
 
   src = fetchurl {
-    url = "http://www.python.org/ftp/python/${version}/Python-${version}.tar.xz";
+    url = "https://www.python.org/ftp/python/${majorVersion}.${minorVersion}/Python-${version}.tar.xz";
     sha256 = "0y7rl603vmwlxm6ilkhc51rx2mfj14ckcz40xxgs0ljnvlhp30yp";
   };
 
@@ -164,12 +168,12 @@ let
       '';
 
     passthru = rec {
+      inherit libPrefix;
       inherit zlibSupport;
       isPy2 = true;
       isPy27 = true;
       buildEnv = callPackage ../../wrapper.nix { python = self; };
       withPackages = import ../../with-packages.nix { inherit buildEnv; pythonPackages = python27Packages; };
-      libPrefix = "python${majorVersion}";
       executable = libPrefix;
       sitePackages = "lib/${libPrefix}/site-packages";
       interpreter = "${self}/bin/${executable}";
diff --git a/pkgs/development/interpreters/python/cpython/3.3/default.nix b/pkgs/development/interpreters/python/cpython/3.3/default.nix
index cb48186a69e7bc..0981604f66ec02 100644
--- a/pkgs/development/interpreters/python/cpython/3.3/default.nix
+++ b/pkgs/development/interpreters/python/cpython/3.3/default.nix
@@ -21,8 +21,11 @@ with stdenv.lib;
 
 let
   majorVersion = "3.3";
+  minorVersion = "6";
+  minorVersionSuffix = "";
   pythonVersion = majorVersion;
-  version = "${majorVersion}.6";
+  version = "${majorVersion}.${minorVersion}${minorVersionSuffix}";
+  libPrefix = "python${majorVersion}";
 
   buildInputs = filter (p: p != null) [
     zlib bzip2 lzma gdbm sqlite db readline ncurses openssl tcl tk libX11 xproto
@@ -37,7 +40,7 @@ stdenv.mkDerivation {
   inherit buildInputs;
 
   src = fetchurl {
-    url = "http://www.python.org/ftp/python/${version}/Python-${version}.tar.xz";
+    url = "https://www.python.org/ftp/python/${majorVersion}.${minorVersion}/Python-${version}.tar.xz";
     sha256 = "0gsxpgd5p4mwd01gw501vsyahncyw3h9836ypkr3y32kgazy89jj";
   };
 
@@ -74,14 +77,14 @@ stdenv.mkDerivation {
   '';
 
   passthru = rec {
+    inherit libPrefix;
     zlibSupport = zlib != null;
     sqliteSupport = sqlite != null;
     dbSupport = db != null;
     readlineSupport = readline != null;
     opensslSupport = openssl != null;
     tkSupport = (tk != null) && (tcl != null) && (libX11 != null) && (xproto != null);
-    libPrefix = "python${majorVersion}";
-    executable = "python3.3m";
+    executable = "${libPrefix}m";
     buildEnv = callPackage ../../wrapper.nix { python = self; };
     withPackages = import ../../with-packages.nix { inherit buildEnv; pythonPackages = python33Packages; };
     isPy3 = true;
diff --git a/pkgs/development/interpreters/python/cpython/3.4/default.nix b/pkgs/development/interpreters/python/cpython/3.4/default.nix
index 2e7d3a03141ea6..70d80b9bb8d3fd 100644
--- a/pkgs/development/interpreters/python/cpython/3.4/default.nix
+++ b/pkgs/development/interpreters/python/cpython/3.4/default.nix
@@ -23,9 +23,11 @@ with stdenv.lib;
 
 let
   majorVersion = "3.4";
+  minorVersion = "5";
+  minorVersionSuffix = "";
   pythonVersion = majorVersion;
-  version = "${majorVersion}.5";
-  fullVersion = "${version}";
+  version = "${majorVersion}.${minorVersion}${minorVersionSuffix}";
+  libPrefix = "python${majorVersion}";
 
   buildInputs = filter (p: p != null) [
     zlib
@@ -45,14 +47,14 @@ let
 
 in
 stdenv.mkDerivation {
-  name = "python3-${fullVersion}";
+  name = "python3-${version}";
   pythonVersion = majorVersion;
   inherit majorVersion version;
 
   inherit buildInputs;
 
   src = fetchurl {
-    url = "http://www.python.org/ftp/python/${version}/Python-${fullVersion}.tar.xz";
+    url = "http://www.python.org/ftp/python/${version}/Python-${version}.tar.xz";
     sha256 = "12l9klp778wklxmckhghniy5hklss8r26995pyd00qbllk4b2r7f";
   };
 
@@ -98,14 +100,14 @@ stdenv.mkDerivation {
   '';
 
   passthru = rec {
+    inherit libPrefix;
     zlibSupport = zlib != null;
     sqliteSupport = sqlite != null;
     dbSupport = db != null;
     readlineSupport = readline != null;
     opensslSupport = openssl != null;
     tkSupport = (tk != null) && (tcl != null) && (libX11 != null) && (xproto != null);
-    libPrefix = "python${majorVersion}";
-    executable = "python3.4m";
+    executable = "${libPrefix}m";
     buildEnv = callPackage ../../wrapper.nix { python = self; };
     withPackages = import ../../with-packages.nix { inherit buildEnv; pythonPackages = python34Packages; };
     isPy3 = true;
diff --git a/pkgs/development/interpreters/python/cpython/3.5/default.nix b/pkgs/development/interpreters/python/cpython/3.5/default.nix
index 69d3df32a326c4..8cb7ac9d07875b 100644
--- a/pkgs/development/interpreters/python/cpython/3.5/default.nix
+++ b/pkgs/development/interpreters/python/cpython/3.5/default.nix
@@ -22,9 +22,11 @@ with stdenv.lib;
 
 let
   majorVersion = "3.5";
+  minorVersion = "2";
+  minorVersionSuffix = "";
   pythonVersion = majorVersion;
-  version = "${majorVersion}.2";
-  fullVersion = "${version}";
+  version = "${majorVersion}.${minorVersion}${minorVersionSuffix}";
+  libPrefix = "python${majorVersion}";
 
   buildInputs = filter (p: p != null) [
     zlib
@@ -42,14 +44,14 @@ let
   ] ++ optionals stdenv.isDarwin [ CF configd ];
 in
 stdenv.mkDerivation {
-  name = "python3-${fullVersion}";
+  name = "python3-${version}";
   pythonVersion = majorVersion;
   inherit majorVersion version;
 
   inherit buildInputs;
 
   src = fetchurl {
-    url = "http://www.python.org/ftp/python/${version}/Python-${fullVersion}.tar.xz";
+    url = "https://www.python.org/ftp/python/${majorVersion}.${minorVersion}/Python-${version}.tar.xz";
     sha256 = "0h6a5fr7ram2s483lh0pnmc4ncijb8llnpfdxdcl5dxr01hza400";
   };
 
@@ -106,14 +108,14 @@ stdenv.mkDerivation {
   '';
 
   passthru = rec {
+    inherit libPrefix;
     zlibSupport = zlib != null;
     sqliteSupport = sqlite != null;
     dbSupport = false;
     readlineSupport = readline != null;
     opensslSupport = openssl != null;
     tkSupport = (tk != null) && (tcl != null) && (libX11 != null) && (xproto != null);
-    libPrefix = "python${majorVersion}";
-    executable = "python${majorVersion}m";
+    executable = "${libPrefix}m";
     buildEnv = callPackage ../../wrapper.nix { python = self; };
     withPackages = import ../../with-packages.nix { inherit buildEnv; pythonPackages = python35Packages; };
     isPy3 = true;
diff --git a/pkgs/development/interpreters/python/cpython/3.6/default.nix b/pkgs/development/interpreters/python/cpython/3.6/default.nix
index 3a6635cd8b621f..7361a6b7cdde5d 100644
--- a/pkgs/development/interpreters/python/cpython/3.6/default.nix
+++ b/pkgs/development/interpreters/python/cpython/3.6/default.nix
@@ -24,9 +24,11 @@ with stdenv.lib;
 
 let
   majorVersion = "3.6";
+  minorVersion = "0";
+  minorVersionSuffix = "a3";
   pythonVersion = majorVersion;
-  version = "${majorVersion}.0a3";
-  fullVersion = "${version}";
+  version = "${majorVersion}.${minorVersion}${minorVersionSuffix}";
+  libPrefix = "python${majorVersion}";
 
   buildInputs = filter (p: p != null) [
     glibc
@@ -46,14 +48,14 @@ let
   ] ++ optionals stdenv.isDarwin [ CF configd ];
 in
 stdenv.mkDerivation {
-  name = "python3-${fullVersion}";
+  name = "python3-${version}";
   pythonVersion = majorVersion;
   inherit majorVersion version;
 
   inherit buildInputs;
 
   src = fetchurl {
-    url = "https://www.python.org/ftp/python/${majorVersion}.0/Python-${fullVersion}.tar.xz";
+    url = "https://www.python.org/ftp/python/${majorVersion}.${minorVersion}/Python-${version}.tar.xz";
     sha256 = "08c3598bwihibwca9lwxq923sjq9shvgv3wxv4vkga2n6hf63l1c";
   };
 
@@ -101,14 +103,14 @@ stdenv.mkDerivation {
   '';
 
   passthru = rec {
+    inherit libPrefix;
     zlibSupport = zlib != null;
     sqliteSupport = sqlite != null;
     dbSupport = db != null;
     readlineSupport = readline != null;
     opensslSupport = openssl != null;
     tkSupport = (tk != null) && (tcl != null) && (libX11 != null) && (xproto != null);
-    libPrefix = "python${majorVersion}";
-    executable = "python${majorVersion}m";
+    executable = "${libPrefix}m";
     buildEnv = callPackage ../../wrapper.nix { python = self; };
     withPackages = import ../../with-packages.nix { inherit buildEnv; pythonPackages = python36Packages; };
     isPy3 = true;
diff --git a/pkgs/development/interpreters/python/pypy/2.7/default.nix b/pkgs/development/interpreters/python/pypy/2.7/default.nix
index c0bd10a0d43720..0d9d619e48a8fe 100644
--- a/pkgs/development/interpreters/python/pypy/2.7/default.nix
+++ b/pkgs/development/interpreters/python/pypy/2.7/default.nix
@@ -5,9 +5,11 @@
 assert zlibSupport -> zlib != null;
 
 let
-
-  majorVersion = "5.4.1";
-  version = "${majorVersion}";
+  majorVersion = "5.4";
+  minorVersion = "1";
+  minorVersionSuffix = "";
+  pythonVersion = "2.7";
+  version = "${majorVersion}.${minorVersion}${minorVersionSuffix}";
   libPrefix = "pypy${majorVersion}";
 
   pypy = stdenv.mkDerivation rec {