Merge branch 'master' into python-control-flow

Author: brendaweles

polars-groupby/README.md

@@ -1,14 +1,27 @@
-This download contains materials for the Real Python tutorial [How to Group Data Using Polars .group_by()](https://realpython.com/aggregating-and-grouping-data-in-polars-groupby/).
+# How to Group Data Using Polars `.group_by()`
 
-You should create a new folder named aggregations on your computer and place each of these files inside it. You may also consider creating a [Python virtual environment](https://realpython.com/python-virtual-environments-a-primer/) within this folder.
+This download contains materials for the Real Python tutorial [How to Group Data Using Polars `.group_by()`](https://realpython.com/polars-groupby/).
 
-Your download bundle contains the following files:
+## Installation
+
+Create a [Python virtual environment](https://realpython.com/python-virtual-environments-a-primer/), activate it, and install Polars along with its dependencies into it:
+
+```sh
+$ python -m venv venv/
+$ source venv/bin/activate
+(venv) $ python -m pip install polars
+```
 
-course.parquet           - This file contains all data from both `math.parquet` and `portuguese.parquet`.
-math.parquet             - This file contains data relating to a mathematics class.
-portuguese.parquet       - This file contains data relating to a Portuguese language class.
-student.txt              - This file defines every field in the three files above.
-math_classes.parquet     - This file contains data used in the time series analysis examples.
+## Contents
+
+Your download bundle contains the following files:
 
-tutorial_code.ipynb      - This file contains the code used in the tutorial.
-solutions.ipynb          - This file contains the solutions to the exercises.
+| Filename                  | Description                                                   |
+|------------------------   |------------------------------------------------------------   |
+| `course.parquet`          | All data from both `math.parquet` and `portuguese.parquet`    |
+| `math.parquet`            | Data relating to a mathematics class                          |
+| `portuguese.parquet`      | Data relating to a Portuguese language class                  |
+| `student.txt`             | Defines every field in the three files above                  |
+| `math_classes.parquet`    | Data used in the time series analysis examples                |
+| `tutorial_code.ipynb`     | The code used in the tutorial                                 |
+| `solutions.ipynb`         | The solutions to the exercises                                |

polars-groupby/post_tr2.md

@@ -0,0 +1,3 @@
+# 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/README.md

@@ -0,0 +1,3 @@
+for hour in range(0, 24):
+    for minute in range(0, 60):
+        print(f"{hour:02d}:{minute:02d}")

python-nested-loops/clock_analogy.py

@@ -0,0 +1,5 @@
+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 found: id={first_id} is a duplicate.")

python-nested-loops/duplicate_check1.py

@@ -0,0 +1,7 @@
+crew_ids = [1, 2, 8, 4, 5, 6, 7, 8, 9, 10]
+detected = set()
+for crew_id in crew_ids:
+    if crew_id in detected:
+        print(f"Clone found: id={crew_id} is a duplicate.")
+    else:
+        detected.add(crew_id)

python-nested-loops/duplicate_check2.py

@@ -0,0 +1,7 @@
+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/duplicate_check3.py

@@ -0,0 +1,7 @@
+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"All resources gathered for interstellar travels: {total_resources}")

python-nested-loops/multilist_sum.py

@@ -0,0 +1,6 @@
+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/multiplication_table.py

@@ -0,0 +1,8 @@
+while True:
+    word = input("Enter a word (or type 'exit' to stop): ")
+
+    if word == "exit":
+        break
+
+    for letter in word:
+        print(letter)