Clarify error message in csv module

[cool-RR]

BPO	40876
Nosy	@cool-RR, @nanjekyejoannah
PRs	bpo-40876: Clarify error message in the csv module #20653

^{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 = <Date 2020-06-05.20:58:07.999>
created_at = <Date 2020-06-05.17:00:03.928>
labels = ['type-bug', 'library', '3.10']
title = 'Clarify error message in csv module'
updated_at = <Date 2020-06-05.20:58:07.998>
user = 'https://github.com/cool-RR'

bugs.python.org fields:

activity = <Date 2020-06-05.20:58:07.998>
actor = 'nanjekyejoannah'
assignee = 'none'
closed = True
closed_date = <Date 2020-06-05.20:58:07.999>
closer = 'nanjekyejoannah'
components = ['Library (Lib)']
creation = <Date 2020-06-05.17:00:03.928>
creator = 'cool-RR'
dependencies = []
files = []
hgrepos = []
issue_num = 40876
keywords = ['patch']
message_count = 3.0
messages = ['370769', '370785', '370786']
nosy_count = 2.0
nosy_names = ['cool-RR', 'nanjekyejoannah']
pr_nums = ['20653']
priority = 'normal'
resolution = None
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue40876'
versions = ['Python 3.10']

[cool-RR]

I was working with the csv module, and I vaguely remembered that you should open files in binary mode. So I did.

Then I saw this error message:

_csv.Error: iterator should return strings, not bytes (did you open the file in text mode?)

I read the end and thought "I didn't open it in text mode, what does it want from me?!" It took a careful reading to figure out that I was *supposed to* open it in text mode.

I'm going to open a PR to slightly change the text to:

_csv.Error: iterator should return strings, not bytes (the file should be opened in text mode)

[nanjekyejoannah]

New changeset 235f918 by Ram Rachum in branch 'master':
bpo-40876: Clarify error message in the csv module (GH-20653)
235f918

[nanjekyejoannah]

PR merged. We can close this. Thanks Ram.