Iain Bullard 88a1134657
Fix DynamoDb2 ExpressionAttributeNames can start with a number (#3206)
When using pynamodb's support for transactions it makes use of of
ExpressionAttributeNames that look like #0 #1 etc. According to

https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Expressions.ExpressionAttributeNames.html

And when testing against dynamodb-local these work without issue,
however, when testing with moto they fail.
2020-07-31 17:46:48 +01:00
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