Merge pull request #630 from realpython/python-join-strings

Add code for string join tutorial

Author: brendaweles

python-join-strings/README.md

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+# How to Join Strings in Python
+
+This folder contains code associated with the Real Python tutorial [How to Join Strings 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 file:
+        return json.load(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)

python-join-strings/join_concatenation.py

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+cities = ["Hanoi", "Adelaide", "Odessa", "Vienna"]
+travel_path = "->".join(cities)
+print(travel_path)

python-join-strings/plus_loop_concatenation.py

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+cities = ["Hanoi", "Adelaide", "Odessa", "Vienna"]
+separator = "->"
+
+travel_path = ""
+for i, city in enumerate(cities):
+    travel_path += city
+    if i < len(cities) - 1:
+        travel_path += separator
+
+print(travel_path)

python-join-strings/url_builder.py

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+base_url = "https://example.com/"
+subpaths = ["blog", "2025", "01", "my-post"]
+
+full_url = base_url + "/".join(subpaths)
+print(full_url)