correct call grammar error (#3473)

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branch : 2.7
fix load_verify_locations on unicode paths (closes #22244)

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branch : 2.7
PEP 466: backport hashlib algorithm constants (closes #21307)

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branch : 2.7
PEP 466: backport persistent urandom fd (closes #21305)

Patch from Alex Gaynor.

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branch : 2.7
extra : amend_source : 6e54b2fc71e1f4ed53fabf2b9234d450cf94410c