STYLE: Use f-string in io/parsers#30466

Merged

jreback merged 8 commits intopandas-dev:masterfrom

naomi172839:master

Dec 25, 2019

Commits on Dec 25, 2019

replaced ".format()" strings with the new f-style strings except for the string at line 1501. That still requires work.
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replaced ".format()" strings with the new f-style strings except for the string at line 1501. That still requires work.
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fixed styling issues (hopefully) causing flake8 to fail.
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fixed styling issues (hopefully) causing flake8 to fail.
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Fixed a formatting error on one of the strings causing the integration tests to fail
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Fixed an issue with :s vs !s
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Ran Black again to try to get it to pass linting
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Added parentheses to avoid a type error
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