Add str.replaceall?

[d05aef1e-abc2-4a6e-b042-f2fd671dd9f2]

BPO	43015
Nosy	@rhettinger, @vstinner, @ezio-melotti, @stevendaprano, @nathanielmanistaatgoogle

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields: ```python assignee = None closed_at = None created_at = labels = ['type-feature', '3.10', 'expert-unicode'] title = 'Add str.replaceall?' updated_at = user = 'https://github.com/nathanielmanistaatgoogle' ``` bugs.python.org fields: ```python activity = actor = 'rhettinger' assignee = 'none' closed = False closed_date = None closer = None components = ['Unicode'] creation = creator = 'Nathaniel Manista' dependencies = [] files = [] hgrepos = [] issue_num = 43015 keywords = [] message_count = 5.0 messages = ['385581', '385616', '385617', '385687', '385842'] nosy_count = 5.0 nosy_names = ['rhettinger', 'vstinner', 'ezio.melotti', 'steven.daprano', 'Nathaniel Manista'] pr_nums = [] priority = 'normal' resolution = 'later' stage = None status = 'pending' superseder = None type = 'enhancement' url = 'https://bugs.python.org/issue43015' versions = ['Python 3.10'] ```

[d05aef1e-abc2-4a6e-b042-f2fd671dd9f2]

Chained str.replace calls can sometimes be pretty unattractive; what are the chances that we could have an str.replaceall method? Of type Callable[[Mapping[str, str]], str]?

Check out absl::StrReplaceAll (https://github.com/abseil/abseil-cpp/blob/22771d471930ce88e1e75d0ca9dd8c65a7b0f895/absl/strings/str_replace.h#L73-L98) for a similarly useful function in C++.

[vstinner]

Hi, the bug tracker is not the right place to propose to add a new method to the builtin str type. I suggest to propose it on the python-ideas list. I'm quite sure that it was proposed at least once, so please search in the archives.

[vstinner]

https://mail.python.org/mailman3/lists/python-ideas.python.org/

[stevendaprano]

Versions 3.6-3.9 are all in feature-freeze, so the earliest this could be added is version 3.10.

[rhettinger]

Marking as "pending" while a discussion takes place on python-ideas.