csv: Non global alternative to csv.field_size_limit

[CarlosRamos]

BPO	36121
Nosy	@remilapeyre
PRs	bpo-36121: Override field_size_limit per csv.reader object #12071

^{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:

assignee = None
closed_at = None
created_at = <Date 2019-02-26.11:44:07.897>
labels = ['3.8', 'type-feature', 'library']
title = 'csv: Non global alternative to csv.field_size_limit'
updated_at = <Date 2019-02-27.16:10:41.313>
user = 'https://bugs.python.org/CarlosRamos'

bugs.python.org fields:

activity = <Date 2019-02-27.16:10:41.313>
actor = 'remi.lapeyre'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2019-02-26.11:44:07.897>
creator = 'Carlos Ramos'
dependencies = []
files = []
hgrepos = []
issue_num = 36121
keywords = ['patch']
message_count = 2.0
messages = ['336651', '336657']
nosy_count = 2.0
nosy_names = ['remi.lapeyre', 'Carlos Ramos']
pr_nums = ['12071']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue36121'
versions = ['Python 3.8']

[CarlosRamos]

The function csv.field_size_limit gets and sets a global variable. It would be useful to change this limit in a per-reader or per-thread basis, so that a library can change it without affecting global state.

[remilapeyre]

Hi Carlos, I think this can be added as a new field_size_limit keyword argument to csv.reader().

I will work on it.