fix sourcery's suggestions

[bleudev]

closes #21

Summary by Sourcery

This pull request addresses several issues in the UDict class, including fixing dictionary initialization, item setting logic, length calculation, iteration, and boolean checks. Additionally, new tests have been added to verify these fixes and ensure proper exception handling.

• Bug Fixes:
  • Fixed incorrect handling of dictionary initialization in UDict class.
  • Corrected the logic for setting item values in UDict to handle lists and tuples properly.
  • Fixed the length calculation method to return the correct dictionary length.
  • Corrected the iteration method to iterate over dictionary items instead of a non-existent 'items' attribute.
  • Fixed the boolean check method to use the correct magic method 'bool' instead of 'nonzero'.
• Tests:
  • Added tests to verify the behavior of UDict initialization with different parameters.
  • Included tests to check the handling of non-existent keys in UDict.
  • Added tests to ensure proper exception handling in the 'get' method of UDict.

[sourcery-ai[bot]]

Reviewer's Guide by Sourcery

This pull request addresses issue #21 by implementing several suggestions from Sourcery to improve the code quality and functionality of the UDict class and its associated tests. The changes include refactoring code for better readability, adding new test cases, and fixing existing ones.

File-Level Changes

Files	Changes
tests/test_udict.py ufpy/udict.py	Refactored methods for better readability and efficiency, added new test cases, and fixed existing ones to ensure comprehensive coverage and correct functionality.

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[bleudev]

@sourcery-ai review