fix: parenthesize multiple exception types for Python 3 compatibility

[zeeshanzzz788]

Describe your change:

Several modules currently use invalid Python 3 syntax:

except IndexError, TypeError:

This is Python 2 syntax. In Python 3, multiple exception types must be parenthesized:

except (IndexError, TypeError):

Without the parentheses, importing these modules fails immediately with:

SyntaxError: multiple exception types must be parenthesized

This was introduced by a ruff rewrite (see discussion on #14929). This PR restores valid Python 3 syntax in all 12 affected files, not only maths/greatest_common_divisor.py.

Files fixed:

• maths/greatest_common_divisor.py
• digital_image_processing/filters/local_binary_pattern.py
• divide_and_conquer/convex_hull.py
• dynamic_programming/catalan_numbers.py
• project_euler/problem_002/sol4.py
• project_euler/problem_003/sol1.py
• project_euler/problem_003/sol2.py
• project_euler/problem_003/sol3.py
• project_euler/problem_005/sol1.py
• project_euler/problem_007/sol2.py
• web_programming/fetch_well_rx_price.py
• web_programming/instagram_crawler.py

Verification:

• Each file now parses successfully with ast.parse
• python3 -m doctest maths/greatest_common_divisor.py — 18 passed
• Imports of fixed modules succeed again

• Fixes SyntaxError in maths/greatest_common_divisor.py — invalid Python 3 except clause #14929
• Adds a new feature
• Fix bug of an existing algorithm
• Documentation change

Checklist:

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized.
• I know that pull requests will not be merged if they fail the automated tests.
• This PR only changes existing Python algorithm files (no new algorithm files this PR).
• All new Python files are placed inside an existing directory.
• All filenames are based on the type of algorithm but are also easy to understand, with no capital letters or special characters other than underscores.
• All functions and variable names follow Python naming conventions and have descriptive names.
• All functions have type hints.
• All functions and classes have a docstring explaining what they do.
• If a function returns a value, it has a return type hint.
• All functions handle flawed inputs as described in CONTRIBUTING.md.
• All algorithms raise Python exceptions instead of printing errors.
• All new tests pass local test suite.
• All pre-commit checks pass / I have avoided adding modules that require pre-commit hooks.
• I will follow up to the PR comments in a timely manner.

[cclauss]

zero files changed

• SyntaxError in maths/greatest_common_divisor.py — invalid Python 3 except clause #14929 (comment)