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import json

def process_json_file(filepath):

"""

Attempts to load, parse, and process data from a JSON file.

Demonstrates comprehensive try-except-else-finally blocks.

"""

print(f"\n--- Processing file: {filepath} ---")

data = None

file_handle = None # To demonstrate finally closing it

try:

# Attempt to open the file

print("Attempting to open file")

file_handle = open(filepath, 'r')

print("File opened successfully.")

# Attempt to parse JSON from the file

print("Attempting to parse JSON...")

data = json.load(file_handle)

print("JSON parsed successfully!")

# Attempt to access specific data (potentially problematic)

print("Attempting to access specific data fields...")

name = data['name'] # Common key

age = data['age'] # Might be missing or wrong type

print(f" Name: {name}")

print(f" Age: {age}")

# Intentionally try an operation that might cause TypeError if 'age' is not a number

age_in_5_years = age + 5

print(f" Age in 5 years: {age_in_5_years}")

except FileNotFoundError:

print(f"ERROR: The file '{filepath}' was not found.")

except PermissionError:

print(f"ERROR: Permission denied to read the file '{filepath}'.")

except json.JSONDecodeError as e:

print(f"ERROR: Could not decode JSON from '{filepath}'. Invalid JSON format.")

print(f" Details: {e.msg} at line {e.lineno} column {e.colno} (char {e.pos})")

except KeyError as e:

print(f"ERROR: A required key {e} was not found in the JSON data from '{filepath}'.")

if data: # If data was loaded but key is missing

print(f" Available keys: {list(data.keys())}")

except TypeError as e:

print(f"ERROR: A type mismatch occurred while processing data from '{filepath}'.")

print(f" Details: {e}")

print(f" Value causing error might be '{age}' of type {type(age)} when an operation expected a different type.")

except Exception as e: # Catch-all for any other unexpected errors

print(f"AN UNEXPECTED ERROR OCCURRED while processing '{filepath}': {e}")

print(f" Error type: {type(e).__name__}")

else:

# This block executes if NO exceptions were raised in the try block

print("SUCCESS: JSON data processed without any critical errors mentioned above.")

# You could do further processing here that depends on the success of the try block

finally:

# This block ALWAYS executes, regardless of whether an exception occurred or not

print("Finally block: Attempting to clean up resources...")

# You could perform some tasks which are needed to perform at the end of code execution.

# --- Main execution ---

if __name__ == "__main__":

# 1. Test with a valid JSON file

process_json_file("valid_data.json")

# 2. Test with a file that has invalid JSON syntax

process_json_file("invalid_syntax.json")

# 3. Test with a file that doesn't exist

process_json_file("non_existent_file.json")