Lambdaexpr

[apkrelling]

Pull Request description

This PR adds LambdaExpr class.
This PR is an attempt to solve #104 .

• added new ASTKind's
• created LambdaExpr classes
• updated __init__.py to include the new imports and classes in the__all__ list
• added the new class visit method in transpilers/python.py
• added tests in tests/transpilers/test_python.py
• added tests in tests/test_packages.py

How to test these changes

from astx.callables import Argument, Arguments, LambdaExpr
from astx.datatypes import LiteralInt32, Int32
from astx.operators import BinaryOp
from astx.variables import Variable

from astx.transpilers import python as astx2py

### Example with params
params = Arguments(Argument(name="x", type_=Int32))
body = BinaryOp(op_code="+", lhs=Variable(name="x"), rhs=LiteralInt32(1))
lambda_expr = LambdaExpr(params=params, body=body)

lambda_expr.get_struct()
lambda_expr.get_struct(simplified=True)
lambda_expr.__str__()

generator = astx2py.ASTxPythonTranspiler()
generated_code = generator.visit(lambda_expr)
print(generated_code) 

### Example w/o params
body = LiteralInt32(1)
lambda_expr = LambdaExpr(body=body)

lambda_expr.get_struct()
lambda_expr.get_struct(simplified=True)
lambda_expr.__str__()

generator = astx2py.ASTxPythonTranspiler()
generated_code = generator.visit(lambda_expr)
print(generated_code) 

Pull Request checklists

This PR is a:

• bug-fix
• new feature
• maintenance

About this PR:

• it includes tests.
• the tests are executed on CI.
• the tests generate log file(s) (path).
• pre-commit hooks were executed locally.
• this PR requires a project documentation update.

Author's checklist:

• I have reviewed the changes and it contains no misspelling.
• The code is well commented, especially in the parts that contain more
  complexity.
• New and old tests passed locally.

Additional information

params = Arguments(Argument(name="x", type_=Int32))
body = BinaryOp(op_code="+", lhs=Variable(name="x"), rhs=LiteralInt32(1))

# Create the LambdaExpr
lambda_expr = LambdaExpr(params=params, body=body)
lambda_expr

## Reviewer's Checklist

- [ ] I managed to reproduce the problem locally from the `main` branch
- [ ] I managed to test the new changes locally
- [ ] I confirm that the issues mentioned were fixed/resolved .

[apkrelling]

@xmnlab I would just like to check with you if the __str__() method is working the way it's intended to. As of now,

from astx.callables import Argument, Arguments, LambdaExpr
from astx.datatypes import LiteralInt32, Int32
from astx.operators import BinaryOp
from astx.variables import Variable

params = Arguments(Argument(name="x", type_=Int32))
body = BinaryOp(op_code="+", lhs=Variable(name="x"), rhs=LiteralInt32(1))
lambda_expr = LambdaExpr(params=params, body=body)
lambda_expr.__str__()

generates 'lambda x: BinaryOp[+](Variable[x],LiteralInt32(1))' as output. Is that the way it's supposed to be?

[xmnlab]

thanks for working on that @apkrelling !
looks good to me!

about __str__ I think it is ok for now, and we can revisit that in the future

I just added a small comment about a very small thing .. it is just a comment in the code that I think could be removed .. other than that, this PR looks good to be merged.

[github-actions]

🎉 This PR is included in version 0.16.0 🎉

The release is available on:

• 0.16.0
• GitHub release

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