[issue39240] keyerror in string format

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

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)

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nosy: +rhettinger

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39240>
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