Python lambdas are explicitly artificially limited to a single expression. Python has statements which are not expressions, mostly control statements and looping constructs.
The syntax isn't the greatest, but you can get pretty far with Python's ternary expression. Generators in my experience remove the need for most loops. Where lambdas feel really subpar for me is the lack of 'let' and error-handling.
While it IS a conscious decision to force lambdas to be a single expression, extending it to be able to be multiline would screw up with indentation being irrelevant inside of a function call too.
