keyerror in string format

[gerryc89]

BPO	39240
Nosy	@rhettinger, @ericvsmith, @ezio-melotti
Files	test.py: arranged test for recreate the problem, and a workaround

^{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 2020-01-07.01:16:21.822>
created_at = <Date 2020-01-07.01:01:11.775>
labels = ['invalid', 'type-bug', '3.8']
title = 'keyerror in string format'
updated_at = <Date 2020-01-07.01:19:28.509>
user = 'https://bugs.python.org/gerryc89'

bugs.python.org fields:

activity = <Date 2020-01-07.01:19:28.509>
actor = 'rhettinger'
assignee = 'none'
closed = True
closed_date = <Date 2020-01-07.01:16:21.822>
closer = 'eric.smith'
components = []
creation = <Date 2020-01-07.01:01:11.775>
creator = 'gerryc89'
dependencies = []
files = ['48830']
hgrepos = []
issue_num = 39240
keywords = []
message_count = 3.0
messages = ['359483', '359484', '359485']
nosy_count = 5.0
nosy_names = ['rhettinger', 'eric.smith', 'ezio.melotti', 'mrabarnett', 'gerryc89']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue39240'
versions = ['Python 3.8']

[gerryc89]

Hi, i think tha this is a problem, i'm not have mutch experiencing in programming with python. I have added in the file the line that create the problem and a line that make fully functional. Thanks for the time.
Gerry

[ericvsmith]

When creating a bug report, please show the actual errors that you get.

This is not a bug in python. In line 5 you're looking for composer2['third'], so of course you'd need to define it.

[rhettinger]

Instead of doing lookups with square brackets, consider using the dict.get() method that returns a default value rather than raising a KeyError for a missing key.

composer2[input1]  --> composer2.get(input1, 0)