define the minimum supported Python version as 3.6 (danmar#7007)

Author: firewave

.github/workflows/scriptcheck.yml

@@ -18,7 +18,7 @@ permissions:
 jobs:
   build:
 
-    # 'ubuntu-22.04' removes Python 3.5 and 3.6 so keep the previous LTS version
+    # 'ubuntu-22.04' removes Python 3.6 so keep the previous LTS version
     runs-on: ubuntu-20.04
 
     steps:
@@ -44,7 +44,7 @@ jobs:
   scriptcheck:
 
     needs: build
-    # 'ubuntu-22.04' removes Python 3.5 and 3.6 so keep the previous LTS version
+    # 'ubuntu-22.04' removes Python 3.6 so keep the previous LTS version
     runs-on: ubuntu-20.04
     strategy:
       matrix:
@@ -101,7 +101,7 @@ jobs:
         if: matrix.python-latest
         run: |
           shopt -s globstar
-          pylint --jobs $(nproc) addons/**/*.py htmlreport/cppcheck-htmlreport htmlreport/**/*.py test/**/*.py tools/**/*.py
+          pylint --jobs $(nproc) --py-version 3.6 addons/**/*.py htmlreport/cppcheck-htmlreport htmlreport/**/*.py test/**/*.py tools/**/*.py
 
       - name: check .json files
         if: matrix.python-latest

cmake/findDependencies.cmake

@@ -64,9 +64,15 @@ else()
     endif()
 endif()
 
-if(NOT Python_Interpreter_FOUND AND NOT USE_MATCHCOMPILER_OPT STREQUAL "Off")
-    message(WARNING "No python interpreter found - disabling matchcompiler.")
-    set(USE_MATCHCOMPILER_OPT "Off")
+if(NOT Python_Interpreter_FOUND)
+    if(NOT USE_MATCHCOMPILER_OPT STREQUAL "Off")
+        message(WARNING "No python interpreter found - disabling matchcompiler.")
+        set(USE_MATCHCOMPILER_OPT "Off")
+    endif()
+else()
+    if(${Python_VERSION} VERSION_LESS 3.6)
+        message(FATAL_ERROR "The minimum supported Python version is 3.6 - found ${Python_VERSION}")
+    endif()
 endif()
 
 if(NOT USE_BUNDLED_TINYXML2)

readme.md

@@ -47,6 +47,8 @@ There are multiple compilation choices:
 * GCC (g++)
 * Clang (clang++)
 
+The minimum required Python version is 3.6.
+
 ### CMake
 
 The minimum required version is CMake 3.5.

tools/donate-cpu.py

@@ -125,10 +125,10 @@
         print('Unhandled argument: ' + arg)
         sys.exit(1)
 
-if sys.version_info.major < 3 or (sys.version_info.major == 3 and sys.version_info.minor < 4):
+if sys.version_info.major < 3 or (sys.version_info.major == 3 and sys.version_info.minor < 6):
     print("#" * 80)
     print("IMPORTANT")
-    print("Please run the client with at least Python 3.4, thanks!")
+    print("Please run the client with at least Python 3.6, thanks!")
     print("#" * 80)
     time.sleep(2)
     sys.exit(1)