Sample code for: Python 3.15 Preview: UTF-8 by Default

python315-utf8-default/README.md

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+# Python 3.15 Preview: UTF-8 by Default
+
+This folder provides the code examples for the Real Python tutorial [Python 3.15 Preview: UTF-8 by Default](https://realpython.com/python315-utf8-default/)

python315-utf8-default/app_v1.py

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+import json
+
+with open("data.json") as f:
+    data = json.load(f)
+
+print(f"Loaded {len(data)} entries")

python315-utf8-default/app_v2.py

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+from constants import ENCODING
+
+with open("data.json", encoding=ENCODING) as f:
+    data = f.read()
+
+print(f"Loaded {len(data)} entries")

python315-utf8-default/constants.py

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+ENCODING = "utf-8"  # Single source of truth for text I/O

python315-utf8-default/explicit_encoding.py

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+with open("data.json", encoding="utf-8") as f:  # Portable and unambiguous
+    data = f.read()
+
+with open("legacy.csv", encoding="locale") as f:  # Intentional locale use
+    legacy = f.read()

python315-utf8-default/locale_encoding.py

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+with open("legacy.csv", encoding="locale") as f:
+    legacy = f.read()

python315-utf8-default/main.py

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+import textlib
+
+textlib.read_text("notes.txt")

python315-utf8-default/os_encoding.py

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+import locale
+
+print(locale.getencoding())  # The real OS encoding, ignores UTF-8 Mode

python315-utf8-default/textlib.py

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+import io
+
+
+def read_text(path, encoding=None):
+    encoding = io.text_encoding(encoding)  # Points at the caller
+    with open(path, encoding=encoding) as f:
+        return f.read()