all Python 3pprintfunction

pprint.saferepr()

to string

An object's repr() protected against infinite recursion: a loop in a list or dict is replaced by a <Recursion on list with id=…> placeholder.

Syntax

text = pprint.saferepr(object)

Unlike pformat(), it never breaks lines — good for logs and error messages where the data may contain loops. The non-obvious part: dict keys come out sorted, so saferepr(d) and repr(d) differ. The built-in list repr survives a loop too ([...]), but saferepr shows which object the loop points to, by its id.

Examples

import pprint
print(pprint.saferepr({'b': 1, 'a': 2}))  # → {'a': 2, 'b': 1}
x = [1]
x.append(x)
print(pprint.saferepr(x))  # → ? [1, <Recursion on list with id=140…>] — id меняется

See also

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