Merge pull request #664 from realpython/python-nested-loops-materials

add code for Nested Loops in Python tutorial

Author: brendaweles

python-nested-loops/README.md

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+# Nested Loops in Python
+
+This folder provides the code examples for the Real Python tutorial [Nested Loops in Python](https://realpython.com/nested-loops-python/).

python-nested-loops/clock_analogy.py

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+for hour in range(0, 3):
+    for minute in range(0, 60):
+        print(f"{hour:02d}:{minute:02d}")

python-nested-loops/duplicate_check1.py

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+crew_ids = [1, 2, 8, 4, 5, 6, 7, 8, 9, 10]
+for i, first_id in enumerate(crew_ids):
+    for second_id in crew_ids[i + 1 :]:
+        if first_id == second_id:
+            print(f"Clone detected: id {first_id} is a duplicate.")

python-nested-loops/duplicate_check2.py

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+crew_ids = [1, 2, 8, 4, 5, 6, 7, 8, 9, 10]
+detected = set()
+for id in crew_ids:
+    if id in detected:
+        print(f"Clone found: id {id} is a duplicate.")
+    else:
+        detected.add(id)

python-nested-loops/duplicate_check3.py

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+from collections import Counter
+
+crew_ids = [1, 2, 8, 4, 5, 6, 7, 8, 9, 10]
+detected = Counter(crew_ids)
+for key, value in detected.items():
+    if value > 1:
+        print(f"Clone found: id {key} is a duplicate.")

python-nested-loops/multilist_sum.py

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+resource_donators = [[8, 6, 3], [9, 2, 7], [4, 1, 5]]
+total_resources = 0
+for planet in resource_donators:
+    for resource in planet:
+        total_resources += resource
+print(f"Total resources gotten for interstellar travels: {total_resources}")

python-nested-loops/multiplication_table.py

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+for multiplicant in range(1, 11):
+    for multiplier in range(1, 4):
+        expression = f"{multiplicant:>2d} × {multiplier}"
+        product = multiplicant * multiplier
+        print(f"{expression} = {product:>2d}", end="\t")
+    print()

python-nested-loops/nested_while.py

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+while True:
+    word = input("Enter a word (or type 'exit' to stop): ")
+
+    if word == "exit":
+        break
+
+    for letter in word:
+        print(letter)

python-nested-loops/pancake1.py

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+pancake_stacks = []
+bases = ["plain", "chocolate", "blueberry"]
+toppings = ["honey", "whipped cream", "alien syrup"]
+
+for base in bases:
+    for topping in toppings:
+        pancake_stacks.append(f"{base.capitalize()} pancake with {topping}")
+print(pancake_stacks)

python-nested-loops/pancake2.py

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+bases = ["plain", "chocolate", "blueberry"]
+toppings = ["honey", "whipped cream", "alien syrup"]
+
+pancake_stacks = [
+    f"{base.capitalize()} pancake with {topping}"
+    for base in bases
+    for topping in toppings
+]
+print(pancake_stacks)