feat(solutions): add offset-arrays/python/function

challenges/offset-arrays/solutions/python/function/README.md

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+# offset-arrays/python/function
+
+Created by [@Divlo](https://github.com/Divlo) on 4 October 2021.

challenges/offset-arrays/solutions/python/function/solution.py

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+from typing import List
+import sys
+
+input_values: List[str] = []
+for value in sys.stdin:
+    input_values.append(value.rstrip('\n'))
+
+
+class AssignmentArray:
+    def __init__(self, assignment: str) -> None:
+        identifier = assignment.split('[')[0]
+        rest = assignment.split('[')[1]
+        indexes = rest.split(']')[0]
+        values_string = rest.split(']')[1]
+        first_index_string = indexes.split('..')[0]
+        last_index_string = indexes.split('..')[1]
+        first_index = int(first_index_string)
+        last_index = int(last_index_string)
+        numbers_string = values_string.split('=')[1]
+        numbers_string_array = numbers_string.strip().split(' ')
+        numbers = [int(number) for number in numbers_string_array]
+        values = {}
+        index = 0
+        for virtual_index in range(first_index, last_index + 1):
+            values[virtual_index] = numbers[index]
+            index += 1
+
+        self.identifier = identifier
+        self.first_index = first_index
+        self.last_index = last_index
+        self.values = values
+
+    def get_by_index(self, index: int) -> int:
+        return self.values[index]
+
+
+assignments = {}
+assignments_length = int(input_values[0])
+assignment_index = 0
+for assignment_index in range(0, assignments_length):
+    assignment = input_values[assignment_index + 1]
+    assignment_array = AssignmentArray(assignment)
+    assignments[assignment_array.identifier] = assignment_array
+assignment_index += 1
+
+operation = input_values[assignment_index + 1]
+simplified_operation = operation.split(']')[0]
+nested = simplified_operation.split('[')
+last_operation_index = len(nested) - 1
+operation_identifiers = nested[0:last_operation_index]
+operation_index = 0
+operations_index = int(nested[last_operation_index])
+
+current_value = None
+for index in range(len(operation_identifiers) - 1, -1, -1):
+    current_identifier = operation_identifiers[index]
+    if current_value == None:
+        current_value = assignments[current_identifier].get_by_index(
+            operations_index)
+    else:
+        current_value = assignments[current_identifier].get_by_index(
+            current_value)
+
+print(current_value)