ArrowParseWarnings - turning to errors in 0.15.0

[xmatthias]

Describe your environment

• Operating system: linux
• Python Version: 3.7.3
• Branch: Develop

Step 3: Related logs

site-packages/arrow/factory.py:201: ArrowParseWarning: The .get() parsing method without a format string will parse more strictly in version 0.15.0.See https://github.com/crsmithdev/arrow/issues/612 for more details.

we'll need to find all arrow.get() calls which don't use one of the supported formats (see github issue arrow-py/arrow#612) for more details.

[hroff-1902]

I already grepped for it for a first glance...

[xmatthias]

seems like the warnings will stay for all string-parsing, no matter if it's supported in 0.15.0 or not (so it's not showing us where we're doing something non-supported)

Parsing integers (like arrow.get(since_ms // 1000)) will however continue to work, so i think the imact to freqtrade is very limited, if it impacts us at all.

Also all supported date-formats remain there (and we don't use anything exotic afaik) - so i'm not sure if we need to act. We'll however need to do testing once 0.15.0 hits.

[hroff-1902]

arrow.get(starts, 'YYYYMMDD')

in freqtrade.configuration.arguments.Arguments.parse_timerange() will also be supported...

[hroff-1902]

Have not found any suspicious yet. (grepped for import|from Arrow|arrow, Arrow|arrow)

I wanted to post here the whole list of appearances where arrow.get() is used in the current codebase for review, but a bit lazy for this...

[xmatthias]

This has now landed - and i ran through all modes we have and didn't find any issues, so i'll close this issue now.