Cleanup Project Euler Problem 01 (#2900)

* mv str statement into docstr

* rename var to avoid redefining builtin

* clean up module docstr

project_euler/problem_01/sol1.py

@@ -1,7 +1,7 @@
 """
 Problem Statement:
 If we list all the natural numbers below 10 that are multiples of 3 or 5,
-we get 3,5,6 and 9. The sum of these multiples is 23.
+we get 3, 5, 6 and 9. The sum of these multiples is 23.
 Find the sum of all the multiples of 3 or 5 below N.
 """
 

project_euler/problem_01/sol2.py

@@ -1,7 +1,7 @@
 """
 Problem Statement:
 If we list all the natural numbers below 10 that are multiples of 3 or 5,
-we get 3,5,6 and 9. The sum of these multiples is 23.
+we get 3, 5, 6 and 9. The sum of these multiples is 23.
 Find the sum of all the multiples of 3 or 5 below N.
 """
 
@@ -19,14 +19,14 @@ def solution(n: int = 1000) -> int:
     83700
     """
 
-    sum = 0
+    total = 0
     terms = (n - 1) // 3
-    sum += ((terms) * (6 + (terms - 1) * 3)) // 2  # sum of an A.P.
+    total += ((terms) * (6 + (terms - 1) * 3)) // 2  # total of an A.P.
     terms = (n - 1) // 5
-    sum += ((terms) * (10 + (terms - 1) * 5)) // 2
+    total += ((terms) * (10 + (terms - 1) * 5)) // 2
     terms = (n - 1) // 15
-    sum -= ((terms) * (30 + (terms - 1) * 15)) // 2
-    return sum
+    total -= ((terms) * (30 + (terms - 1) * 15)) // 2
+    return total
 
 
 if __name__ == "__main__":

project_euler/problem_01/sol3.py

@@ -1,7 +1,7 @@
 """
 Problem Statement:
 If we list all the natural numbers below 10 that are multiples of 3 or 5,
-we get 3,5,6 and 9. The sum of these multiples is 23.
+we get 3, 5, 6 and 9. The sum of these multiples is 23.
 Find the sum of all the multiples of 3 or 5 below N.
 """
 
@@ -22,38 +22,38 @@ def solution(n: int = 1000) -> int:
     83700
     """
 
-    sum = 0
+    total = 0
     num = 0
     while 1:
         num += 3
         if num >= n:
             break
-        sum += num
+        total += num
         num += 2
         if num >= n:
             break
-        sum += num
+        total += num
         num += 1
         if num >= n:
             break
-        sum += num
+        total += num
         num += 3
         if num >= n:
             break
-        sum += num
+        total += num
         num += 1
         if num >= n:
             break
-        sum += num
+        total += num
         num += 2
         if num >= n:
             break
-        sum += num
+        total += num
         num += 3
         if num >= n:
             break
-        sum += num
-    return sum
+        total += num
+    return total
 
 
 if __name__ == "__main__":

project_euler/problem_01/sol4.py

@@ -1,7 +1,7 @@
 """
 Problem Statement:
 If we list all the natural numbers below 10 that are multiples of 3 or 5,
-we get 3,5,6 and 9. The sum of these multiples is 23.
+we get 3, 5, 6 and 9. The sum of these multiples is 23.
 Find the sum of all the multiples of 3 or 5 below N.
 """
 

project_euler/problem_01/sol5.py

@@ -1,15 +1,14 @@
 """
 Problem Statement:
 If we list all the natural numbers below 10 that are multiples of 3 or 5,
-we get 3,5,6 and 9. The sum of these multiples is 23.
+we get 3, 5, 6 and 9. The sum of these multiples is 23.
 Find the sum of all the multiples of 3 or 5 below N.
 """
 
-"""A straightforward pythonic solution using list comprehension"""
-
 
 def solution(n: int = 1000) -> int:
     """Returns the sum of all the multiples of 3 or 5 below n.
+       A straightforward pythonic solution using list comprehension.
 
     >>> solution(3)
     0

project_euler/problem_01/sol6.py

@@ -1,7 +1,7 @@
 """
 Problem Statement:
 If we list all the natural numbers below 10 that are multiples of 3 or 5,
-we get 3,5,6 and 9. The sum of these multiples is 23.
+we get 3, 5, 6 and 9. The sum of these multiples is 23.
 Find the sum of all the multiples of 3 or 5 below N.
 """
 

project_euler/problem_01/sol7.py

@@ -1,7 +1,7 @@
 """
 Problem Statement:
 If we list all the natural numbers below 10 that are multiples of 3 or 5,
-we get 3,5,6 and 9. The sum of these multiples is 23.
+we get 3, 5, 6 and 9. The sum of these multiples is 23.
 Find the sum of all the multiples of 3 or 5 below N.
 """