Merge branch 'master' into duck-typing-python

python-bnf-notation/README.md

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+# BNF Notation: Dive Deeper Into Python's Grammar
+
+This folder provides the code examples for the Real Python tutorial [BNF Notation: Dive Deeper Into Python's Grammar](https://realpython.com/python-bnf-notation/).

python-bnf-notation/conditional.py

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+def read_temperature():
+    return 25
+
+
+if (temperature := read_temperature()) < 10:
+    print("The weather is cold!")
+elif 10 <= temperature <= 25:
+    print("The weather is nice!")
+else:
+    print("The weather is hot!")

python-bnf-notation/func_1.py

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+def func():
+    return
+
+
+print(func())

python-bnf-notation/func_2.py

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+def func():
+    return "Hello!"
+
+
+func()

python-bnf-notation/func_3.py

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+def func():
+    return "Hello!", "Pythonista!"
+
+
+func()

python-bnf-notation/func_4.py

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+def func():
+    return ("Hello!",)
+
+
+func()

python-bnf-notation/func_5.py

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+def func():
+    return (
+        "Hello!",
+        "Pythonista!",
+    )
+
+
+func()

python-bnf-notation/loop.py

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+high = 5
+
+for number in range(high):
+    if number > 5:
+        break
+    print(number)
+else:
+    print("range covered")

python-bnf-notation/walrus.py

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+(length := len([1, 2, 3]))
+
+print(length)