Fix python3.8 compatibility

[eric-downes]

PyContracts Python 3.8+ Compatibility Fixes

This PR adds compatibility with Python 3.8+ by fixing several issues.
The changes are minimal and focused on maintaining compatibility.

1. inspect.ArgSpec Removal
   In Python 3.8+, inspect.ArgSpec was removed. Fixed by:

• Adding a custom implementation using collections.namedtuple
• Maintaining the same API and interface expected by the existing codebase
• File modified: src/contracts/backported.py

2. NumPy Deprecated Types
   Several NumPy types used in PyContracts were deprecated:

• Replaced np.int,np.float with np.int64 etc
• Replaced np.complex with np.complex128
• File modified: src/contracts/library/array_ops.py

3. Collections ABC Module Changes
   Abstract base classes moved from collections to collections.abc in Python 3.3+:

• Added conditional import based on Python version
• Used collections.abc for Container, Iterable, etc. in Python 3.3+
• Replaced collections.Callable with the built-in callable function
• File modified: src/contracts/library/miscellaneous_aliases.py

4. Invalid Escape Sequences in Regular Expressions
   Fixed SyntaxWarnings related to invalid escape sequences in regular expressions:

• Replaced \s with r'\s'; raw strings FTW!
• File modified: src/contracts/docstring_parsing.py

Testing. All functionality tested with Python 3.8+:

• Basic contract checking
• Type description
• Docstring parsing
• String utilities
• Exception wrapping

[eric-downes]

I believe this addresses #72

[eric-downes]

1. Created a compatibility layer in py_compatibility.py that handles:
   • String type differences between Python 2 and 3
   • Collections module changes in Python 3.12+
   • Exception handling differences
   • StringIO compatibility
2. Updated string handling:
   - Replaced all occurrences of six.string_types with our string_types
   - Fixed string formatting and comparison
3. Fixed collections imports for Python 3.12 compatibility:
   - Updated imports in seq.py, map.py, and sets.py
   - Centralized the imports in the compatibility layer
4. Exception handling:
   - Created helpers for properly wrapping exceptions
   - Updated key methods to catch and wrap exceptions consistently
   - Fixed the Contract.check method to handle all exceptions
5. Fixed old-style class checking for Python 2 compatibility
6. Provided documentation:
   - Created a detailed changelog
   - Created an update guide for other projects
   - Provided a test script to verify the fixes

[eric-downes]

I believe this resolves the following issues
#101 #72 #82

[Ajadaz]

There seems to be an error in setup.py. Tried installing through pip and got

  × python setup.py egg_info did not run successfully.
  │ exit code: 1
  ╰─> [7 lines of output]
      Traceback (most recent call last):
        File "<string>", line 2, in <module>
        File "<pip-setuptools-caller>", line 34, in <module>
        File "C:\Users\me\AppData\Local\Temp\pip-req-build-98z_4ogz\setup.py", line 71
          classifiers=[
          ^^^^^^^^^^^^^
      SyntaxError: keyword argument repeated: classifiers
      [end of output]

ran this on Python 3.11.2

[eric-downes]

Thanks.  I’ll see if I can reproduce locally.On Apr 10, 2025, at 09:47, Ajadaz ***@***.***> wrote: There seems to be an error in setup.py. Tried installing through pip and got × python setup.py egg_info did not run successfully. │ exit code: 1 ╰─> [7 lines of output] Traceback (most recent call last): File "<string>", line 2, in <module> File "<pip-setuptools-caller>", line 34, in <module> File "C:\Users\me\AppData\Local\Temp\pip-req-build-98z_4ogz\setup.py", line 71 classifiers=[ ^^^^^^^^^^^^^ SyntaxError: keyword argument repeated: classifiers [end of output] ran this on Python 3.11.2—Reply to this email directly, view it on GitHub, or unsubscribe.You are receiving this because you authored the thread.Message ID: ***@***.***> Ajadaz left a comment (AndreaCensi/contracts#106) There seems to be an error in setup.py. Tried installing through pip and got × python setup.py egg_info did not run successfully. │ exit code: 1 ╰─> [7 lines of output] Traceback (most recent call last): File "<string>", line 2, in <module> File "<pip-setuptools-caller>", line 34, in <module> File "C:\Users\me\AppData\Local\Temp\pip-req-build-98z_4ogz\setup.py", line 71 classifiers=[ ^^^^^^^^^^^^^ SyntaxError: keyword argument repeated: classifiers [end of output] ran this on Python 3.11.2 —Reply to this email directly, view it on GitHub, or unsubscribe.You are receiving this because you authored the thread.Message ID: ***@***.***>