Add code for string join tutorial

Author: martin-martin

python-join-strings/README.md

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+# How to Join a String in Python
+
+This folder contains code associated with the Real Python tutorial on [How to Join a String in Python](https://realpython.com/python-join-string/).
+
+## About the Author
+
+Martin Breuss - Email: [email protected]
+
+## License
+
+Distributed under the MIT license. See `LICENSE` for more information.

python-join-strings/event_log.json

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+{
+    "2025-01-24 10:00": ["click", "add_to_cart", "purchase"],
+    "2025-01-24 10:05": ["click", "page_view"],
+    "2025-01-24 10:10": ["page_view", "click", "add_to_cart"]
+}

python-join-strings/format_event_log.py

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+import json
+
+
+def load_log_file(file_path):
+    with open(file_path, mode="r", encoding="utf-8") as event_log_file:
+        return json.load(event_log_file)
+
+
+def format_event_log(event_log):
+    lines = []
+    for timestamp, events in event_log.items():
+        # Convert the events list to a string separated by commas.
+        event_list_str = ", ".join(events)
+        # Create a single line string.
+        line = f"{timestamp} => {event_list_str}"
+        lines.append(line)
+
+    # Join all lines with a newline separator.
+    return "\n".join(lines)
+
+
+if __name__ == "__main__":
+    log_file_path = "event_log.json"
+    event_log = load_log_file(log_file_path)
+    output = format_event_log(event_log)
+    print(output)