don't allow errors in mypy check

.gitignore

  __pycache__
  .coverage
+ .ipynb_checkpoints

ci/mypy.sh

 #!/bin/bash
 
-# What percentage of the code has to be annotated
-THRESHOLD=0.75
-
 # Create Log file
 touch mypy_output.txt
 
@@ -26,18 +23,16 @@ for directory in $( cat directories.txt ); do
 done
 
 # If nothing has been checked
-if [[ $nPasses == 0 && $nErrors == 0 ]]; then
+if [[ $nPasses == 0 ]]; then
     echo "mypy hasn't found any code to check"
-    exit 0
-else
-    # Calculate the ratio of errors
-    percentage=$( python3 -c "print($nPasses/($nErrors+$nPasses))" )
+    exit 1
 fi
 
 rm linecount.txt
 
-if [[ $percentage > $THRESHOLD ]]; then
-    echo "The number of type-errors is below the threshold. Check passed"
+if [[ $nErrors -eq 0 ]]; then
+    echo "No errors found. Check passed"
+    echo "mypy checked ${nPasses} lines of code"
     
     # Create new Badge
 	rm mypy.svg
@@ -45,7 +40,7 @@ if [[ $percentage > $THRESHOLD ]]; then
     
     exit 0
 else
-    echo "mypy found enough errors in the code. You might want to check your code again"
+    echo "mypy found errors in the code. You might want to check your code again"
     echo "Maybe take a look at mypy_output.txt"
     
     # Create Badge

src/main.py

+from typing import Any
+
 class Test:
-    def __init__(self, arg: any):
+    def __init__(self, arg: Any) -> None:
         """Test."""
         print(arg)
 

src/test_sample.py

@@ -2,5 +2,5 @@ def inc(x: int) -> int:
     return x + 1
 
 
-def test_answer():
+def test_answer() -> None:
     assert inc(3) ==4