Solution for Python challenge #2

solution2.py

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+def oddOrEven(nums):
+    '''Given an unsorted list of numbers, return a list that indicates if the value at each index is odd (0) or even (1).'''
+    # EXAMPLE:
+    # Given [2, 4, 5, 7, 8, 10], return [1, 1, 0, 0, 1, 1]
+
+    solution = []
+
+    # Push into solution as we determine if num is even or odd
+    for num in nums:
+        if num % 2 == 0:
+            solution.append(1)
+        else:
+            solution.append(0)
+
+    # Likewise, can also just replace the indexes of nums
+    # for i, num in enumerate(nums):
+    #     if num % 2 == 0:
+    #         nums[i] = 1
+    #     else:
+    #         nums[i] = 0
+
+    return solution     # return nums if use second solution
+
+
+def mostOccurences(nums):
+    '''Given an unsorted list of numbers, returns the value that occured the most in nums.'''
+    # Hint: use oddOrEven to test function faster
+    # Hint: use a map
+    # Hint: https://stackoverflow.com/questions/13098638/how-to-iterate-over-the-elements-of-a-map-in-python
+
+    uniqueCount = {}
+
+    for num in nums:
+        # Check if key already exists, if so, just add one to count
+        if num in uniqueCount:
+            uniqueCount[num] += 1
+        # Key doesn't exist, set count to 1
+        else:
+            uniqueCount[num] = 1
+
+    answer = -1     # answer to keep track of the key
+    maxCount = 0    # maxCount to keep track of max count we've seen in uniqueCount
+    for key in uniqueCount:
+        if uniqueCount[key] > maxCount:
+            answer = key                    # update answer
+            maxCount = uniqueCount[key]     # update maxCount
+
+    return answer
+
+
+def main():
+    '''The main function is where you will test all of your functions.'''
+    # Testing challenge 2
+    print("\nTesting oddOrEven")
+    print("EXPECTED:", [1, 1, 0, 0, 1, 1], "\nACTUAL:", oddOrEven([2, 4, 5, 7, 8, 10]))
+    print("\nTesting mostOccurences")
+    print("EXPECTED:", 1, "\nACTUAL:", mostOccurences(oddOrEven([2, 4, 5, 7, 8, 10])))
+    # Add any additional test cases if needed
+
+if __name__ == "__main__":
+    main()