Add type annotations for DeltaGenerator and dataframe mixins #4733
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馃摎 Context
Continuing from where I left off in #4657, with adding type annotations to Streamlit's public API.
This one touches a lot of files, partly because I was able to remove the need for
typing.cast
that was repeated in about every non-widget element.What kind of change does this PR introduce?
馃 Description of Changes
DeltaGenerator
class, including;_value_or_dg
pandas.DataFrame
handling.Contribution License Agreement
By submitting this pull request you agree that all contributions to this project are made under the Apache 2.0 license.