How to Parse JSON, TXT, and CSV Files in Python

import json
from pathlib import Path

def parse_json_file(filepath):
    """Read and parse a JSON file, returning its contents."""
    path = Path(filepath)
    with path.open('r', encoding='utf-8') as f:
        return json.load(f)

def parse_txt_lines(filepath):
    """Read a text file and return non-empty stripped lines."""
    path = Path(filepath)
    with path.open('r', encoding='utf-8') as f:
        return [line.strip() for line in f if line.strip()]

def parse_csv_file(filepath):
    """Read a CSV file and return list of rows as lists."""
    import csv
    path = Path(filepath)
    with path.open('r', encoding='utf-8', newline='') as f:
        reader = csv.reader(f)
        return [row for row in reader]

if __name__ == "__main__":
    sample_data = '{"name": "Alice", "age": 30, "city": "Berlin"}'
    Path("sample.json").write_text(sample_data)
    
    Path("sample.txt").write_text("first line\n\nsecond line\n  third line  ")
    
    Path("sample.csv").write_text("id,name\n1,Alice\n2,Bob\n")
    
    print("JSON:", parse_json_file("sample.json"))
    print("TXT:", parse_txt_lines("sample.txt"))
    print("CSV:", parse_csv_file("sample.csv"))
    
    for f in ["sample.json", "sample.txt", "sample.csv"]:
        Path(f).unlink()