AoC 2023 Day 1 Part 1

aoc2023/src/day01/python/solution.py

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+# Copyright 2023 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+def _find_first_digit(string: str) -> int:
+  """Returns the left-most digit in a string."""
+  return next(int(char) for char in string if char.isdigit())
+
+
+def _find_last_digit(string: str) -> int:
+  """Returns the right-most digit in a string."""
+  return next(
+    int(string[i]) for i in range(len(string) - 1, -1, -1)
+    if string[i].isdigit())
+
+
+def _get_calibration_value(string: str) -> int:
+  """Calculates calibration value of a string."""
+  return _find_first_digit(string) * 10 + _find_last_digit(string)
+
+
+def sum_calibration_values(calibration_document: tuple[str, ...]) -> int:
+  """Calculates sum of the calibration values.
+
+  The calibration value can be found by combining the first digit and the last
+   digit (in that order) to form a single two-digit number.
+
+  Args
+    calibration_document A calibration document.
+  Returns
+    Sum of all calibration values in the document.
+  """
+  return sum((_get_calibration_value(line) for line in calibration_document))

aoc2023/test/day01/python/example1.txt

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+1abc2
+pqr3stu8vwx
+a1b2c3d4e5f
+treb7uchet