bpo-38897: Remove use of deprecated array.fromstring method

[dcoles]

Using array.fromstring generates a DeprecationWarning on current versions of Python.

https://bugs.python.org/issue38897

[the-knights-who-say-ni]

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@dcoles

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[corona10]

@dcoles Thanks for the contribution.
Before processing the code review, Would you like to create an issue for this PR on bugs.python.org?

Thank you :)

[dcoles]

@corona10 Issue on bugs.python.org: https://bugs.python.org/issue38897

[corona10]

@dcoles

Thanks for the contribution to the CPython project!!
PR looks good to me :)

@vstinner @serhiy-storchaka
Dear core developers,
@dcoles is the first time contributor to this project.
Please take a look at his PR when you have a time :)
This PR is simple and clear, so it is expected to take less time to review.

[miss-islington]

Thanks @dcoles for the PR, and @methane for merging it 🌮🎉.. I'm working now to backport this PR to: 3.7.
🐍🍒⛏🤖

[bedevere-bot]

GH-17386 is a backport of this pull request to the 3.7 branch.

[tirkarthi]

@methane Could this be backported to 3.8 too?

[methane]

Oh, I missed it. Thank you.

[miss-islington]

Thanks @dcoles for the PR, and @methane for merging it 🌮🎉.. I'm working now to backport this PR to: 3.8.
🐍🍒⛏🤖

[bedevere-bot]

GH-17387 is a backport of this pull request to the 3.8 branch.