Currently repr of doesn't contain much of information besides that it is
a lambda.
>>> lambda x: x**2
<function <lambda> at 0x7f3479b74488>
All lambdas have the same repr, different only by unreadable hexadecimal
address.
What if include the signature and the expression of the lambda in its repr?
>>> lambda x: x**2
<lambda x: x**2>
This would return an old feature of Python 0.9.1
(https://twitter.com/dabeaz/status/934835068043956224).
Repr of function could contain just the signature.
<function foo(bar, baz)>
But there is a problem with default values. Their reprs can be very
long, especially in the following case with mutable default value:
def foo(x, _cache={}):
try:
return _cache[x]
except KeyError:
pass
_cache[x] = y = expensive_calculation(x)
return y
Maybe the placeholder should be always used instead of default values.
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