Other rules for replacing lambda expressions

[ericbn]

Since you have "lambda: [] is equivalent to the builtin list", I suggest other rules with similar refactoring strategies:

• lambda: {} is equivalent to the builtin dict
• lambda arg: f(arg) is equivalent to f
• lambda obj: obj.attr is equivalent to operator.attrgetter('attr')
• lambda items: items[0] is equivalent to operator.itemgetter(0)
• lambda obj: obj.name() is equivalent to operator.methodcaller('name')

The descriptions are still not generic enough, and maybe should not be the ones to be really used.

Some of these rules can be rather complex, in terms of all the possible variations.

[djmattyg007]

lambda obj: obj.name() is equivalent to operator.methodcaller('name')

This may be equivalent, but it is certainly worse. It requires more code, it requires importing another module, and its intent is simply not as clear to inexperienced programmers.