added local maxima function

hands_on/first/test_first.py

@@ -1,6 +1,11 @@
+from first import times_3
+
 def test_times_3_integer():
-    pass
+    result = times_3([1])
+    assert result == [1, 1, 1]
 
 
 def test_times_3_string():
-    pass
+    result = times_3([1])
+    assert result == [2]
+    

hands_on/local_maxima/local_maxima.py

@@ -4,12 +4,18 @@ def find_maxima(x):
     Input arguments:
     x -- 1D list of real numbers
 
+
     Output:
     idx -- list of indices of the local maxima in x
     """
-    return []
+    maxima = []
+    for index in range(len(x)-2):
+        if x[index+1] > x[index] and x[index +1] > x[index+2]:
+            maxima.append(index+1)
+    
+    return maxima
 
 
 if __name__ == "__main__":
-    x = [1, 2, 3]
+    x = [1, 2, 2, 1]
     print(find_maxima(x))

hands_on/local_maxima/test_local_maxima.py

@@ -0,0 +1,41 @@
+from local_maxima import find_maxima
+
+
+
+def test_local_maxima_empty():
+    value = []
+    expected = []
+
+    result = find_maxima(value)
+
+    assert result == expected
+
+
+def test_local_maxima_plateau():
+    value = [1, 2, 2, 1]
+    expected = []
+
+    result = find_maxima(value)
+
+    assert result == expected
+
+def test_local_maxima_array1():
+    value = [1, 3, 5, 2, 1]
+    expected = [2]
+
+    result = find_maxima(value)
+
+    assert result == expected
+
+
+def test_local_maxima_array2():
+    value = [5, 4, 4, 5]
+    expected = []
+
+    result = find_maxima(value)
+
+    assert result == expected
+
+
+
+