Qual. Replace 'if "ext" in dict_.keys()' with 'if "str" in dict_' #35

Job	Run time
pylint	15s
pre-commit	9s
test_on_old_Pythons (3.7)	5m 27s
test_on_old_Pythons (3.6)	5m 31s
test_on_old_Pythons (2.7)	6m 54s
test_on_old_Pythons (3.8)	15s
test_on_old_Pythons (3.5)	14s
run_tests (3.9, macos-latest)	30s
run_tests (3.9, ubuntu-24.04)	3m 58s
run_tests (3.10, ubuntu-24.04)	11s
run_tests (3.9, windows-latest)	3m 55s
run_tests (3.10, macos-latest)	32s
run_tests (3.10, windows-latest)	3m 49s
run_tests (3.13, macos-latest)	1m 58s
run_tests (3.11, windows-latest)	3m 44s
run_tests (3.12, macos-latest)	11s
run_tests (3.12, ubuntu-24.04)	3m 55s
run_tests (3.13, ubuntu-24.04)	3m 12s
run_tests (3.11, macos-latest)	12s
run_tests (3.13, windows-latest)	3m 30s
run_tests (3.11, ubuntu-24.04)	10s
run_tests (3.12, windows-latest)	3m 56s
run_tests (3.14.0-beta.4, macos-latest)	33s
run_tests (3.14.0-beta.4, ubuntu-24.04)	18s
run_tests (3.14.0-beta.4, windows-latest)	4m 55s
	58m 14s

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