day1: python code

diff --git a/day1/calibration.py b/day1/calibration.py
new file mode 100644 (file)
index 0000000..f8266e1
--- /dev/null
+++ b/day1/calibration.py
@@ -0,0 +1,30 @@
+import re
+
+_NAMES = [
+    'one', 'two', 'three', 'four', 'five',
+    'six', 'seven', 'eight', 'nine'
+]
+
+_DIGITS = {}
+for digit, name in enumerate(_NAMES, 1):
+    _DIGITS[name] = str(digit)
+
+_RX = re.compile('|'.join(_NAMES))
+
+
+def parse_line(line: str) -> int:
+    """Substitute any digit words into digits and then return
+    the 2 digit number made of the first and last digit.
+    Note: handle overlapping words. eg: eightwone as 821"""
+    mod = ''
+    m = True
+    while m:
+        m = _RX.search(line)
+        if m:
+            mod = mod + line[:m.start()] + _DIGITS[m[0]]
+            line = line[m.start() + 1:]
+    mod = mod + line
+
+    found = [c for c in mod if c.isdigit()]
+    pair = found[0] + found[-1]
+    return int(pair)

diff --git a/day1/data/input b/day1/data/input
new file mode 100644 (file)
index 0000000..8a2eb54
--- /dev/null
+++ b/day1/data/input
@@ -0,0 +1,1000 @@
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diff --git a/day1/data/test_input_2 b/day1/data/test_input_2
new file mode 100644 (file)
index 0000000..41aa89c
--- /dev/null
+++ b/day1/data/test_input_2
@@ -0,0 +1,7 @@
+two1nine
+eightwothree
+abcone2threexyz
+xtwone3four
+4nineeightseven2
+zoneight234
+7pqrstsixteen

diff --git a/day1/run.py b/day1/run.py
new file mode 100755 (executable)
index 0000000..92b59ab
--- /dev/null
+++ b/day1/run.py
@@ -0,0 +1,26 @@
+#!/bin/env python3
+
+import sys
+import argparse
+from calibration import parse_line
+
+
+def main(args=None):
+    parser = argparse.ArgumentParser(description="AoC 2023 day 1")
+    parser.add_argument('filename', type=str)
+    parser.add_argument('-d', '--debug', action='store_true')
+    options = parser.parse_args(args)
+
+    sum = 0
+    with open(options.filename, 'r') as input:
+        for line in input:
+            value = parse_line(line)
+            if options.debug:
+                print(line.strip(), value)
+            sum += value
+    print(sum)
+    return 0
+
+
+if __name__ == '__main__':
+    sys.exit(main(sys.argv[1:]))

diff --git a/day1/test_calibration.py b/day1/test_calibration.py
new file mode 100644 (file)
index 0000000..06e4fdc
--- /dev/null
+++ b/day1/test_calibration.py
@@ -0,0 +1,32 @@
+import unittest
+from calibration import parse_line
+
+
+INPUT2 = [
+    ("two1nine", 29),
+    ("eightwothree", 83),
+    ("abcone2threexyz", 13),
+    ("xtwone3four", 24),
+    ("4nineeightseven2", 42),
+    ("zoneight234", 14),
+    ("7pqrstsixteen", 76)
+]
+
+
+class TestCalibration(unittest.TestCase):
+
+    def test_input2(self):
+        sum = 0
+        for line, expected in INPUT2:
+            value = parse_line(line)
+            self.assertEqual(value, expected)
+            sum += value
+        self.assertEqual(sum, 281)
+
+    def test_extra_sneaky(self):
+        line = "eighthree"
+        self.assertEqual(83, parse_line(line))
+
+
+if __name__ == '__main__':
+    unittest.main()