From 32b7b2c14b4756c2e2b536e89cecd4b8280fe5dc Mon Sep 17 00:00:00 2001
From: Julien Palard <julien@palard.fr>
Date: Wed, 8 Nov 2023 10:33:30 +0100
Subject: [PATCH] Logging debug.

---
 fib.py | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/fib.py b/fib.py
index 001286a..5c27f3e 100644
--- a/fib.py
+++ b/fib.py
@@ -1,18 +1,26 @@
 """A demo module implementing fib."""
 import argparse
+import logging
+
+logger = logging.getLogger()
 
 
 def parse_args():
     """Parse command line arguments."""
     parser = argparse.ArgumentParser(description="Compute fibonacci sequence numbers.")
     parser.add_argument("n", type=int, help="To compute the nth element of fib.")
+    parser.add_argument("-v", "--verbose", action="count", help="Be verbose", default=0)
     return parser.parse_args()
 
 
 def fib(n: int) -> int:
     """Return the *n*th element in the Fibonacci sequence."""
     a, b = 1, 1
+    if n < 0:
+        logger.error("It'll go wrong with a negative number.")
+    logger.info(f"In fib, starting with: {a}, {b}")
     for _ in range(n):
+        logger.debug(f"In fib, loop {_} with: {a}, {b}")
         a, b = b, a + b
     return a
 
@@ -20,6 +28,7 @@ def fib(n: int) -> int:
 def main() -> None:
     """The module entry point."""
     args = parse_args()
+    logging.basicConfig(level=[logging.ERROR, logging.INFO, logging.DEBUG][args.verbose])
     print(fib(args.n))