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@@ -1 +1,2 @@
+[![Review Assignment Due Date](https://classroom.github.com/assets/deadline-readme-button-22041afd0340ce965d47ae6ef1cefeee28c7c493a6346c4f15d667ab976d596c.svg)](https://classroom.github.com/a/wXQiiW8O)
 # Lab3

Task_1.py

@@ -0,0 +1,22 @@
+more = [x + 1 for x in [1,2,3,4]]     # List, in order, the values that x takes at each step.
+print()                           # more=[2,3,4,5]
+
+
+def square(n:int) -> int:
+   return n * n                           # Call 1: n=1, returns 1. Call 2: n=2, returns 4. Call 3: n=3, returns 9. Call 4: n=4, returns 16
+squares = [square(x) for x in [1,2,3,4]]   # Squares is a list of the return values for each call of the function
+print()
+
+
+def check(n:int) -> bool:
+   return n > 2                             # Call 1: n=0, returns False. Call 2: n=1, returns False. Call 3: n=2, returns False. Call 4: n=3, returns True. Call 5: n=4, returns True
+answer = [x for x in range(5) if check(x)]   # answer=[3,4]
+print()
+
+
+def inc(m:int) -> int:
+   return m + 1                             # Call 1: m=3, returns 4. Call 2: m=4, returns 5.
+def check(n:int) -> bool:
+   return n > 2                             # Call 1: n=0, returns False. Call 2: n=1, returns False. Call 3: n=2, returns False. Call 4: n=3, returns True. Call 5: n=4, returns True
+answer = [inc(x) for x in range(5) if check(x)]   # answer=[4,5]
+print()

Task_2.py

@@ -0,0 +1,20 @@
+def tally(nums:list[int]) -> int:
+    total = 0
+    for num in nums:
+        total = total + num           # 1: num=4, total=4. 2: num=9, total=13. 3: num=2, total=15. 4: num=1, total=16
+    return total
+result = tally([4, 9, 2, 1])
+
+def copy(nums:list[int]) -> list[int]:
+    new_list = []
+    for idx in range(len(nums)):
+        new_list.append(nums[idx])     # 1: idx=0, new_list=[4]. 2: idx=1, new_list=[4,9]. 3: idx=2, new_list=[4,9,2]. 4: idx=3, new_list=[4,9,2,1]
+    return new_list                    # This loop indexes the input list and makes a new list with all the same numbers in the same place
+result = copy([4, 9, 2, 1])
+
+def increment_all(nums:list[int]) -> list[int]:
+    new_list = []
+    for value in nums:
+        new_list.append(value + 1)     # 1: value=4, new_list=[5]. 2: value=9, new_list=[5,10]. 3: value=2, new_list=[5,10,3]. 4: value=1, new_list=[5,10,3,2]
+    return new_list
+result = increment_all([4, 9, 2, 1])

functions.py

@@ -2,5 +2,5 @@
 # Input: a number to be doubled
 # Result: a number
 def double(n:int) -> int:
-    result = n * n
+    result = 2 * n
     return result

testcases.py

@@ -15,3 +15,6 @@ def test_double_two(self):
 
 if __name__ == '__main__':
     unittest.main()
+
+# test_double_one giving the right answer doesn't imply that the double function is correct.
+# For the value of 2, 2*2=2**2, so it outputs the expected value even if the code is fundamentally incorrect.