【python】 判断纯ascii串
参考：http://stackoverflow.com/questions/3636928/test-if-a-python-string-is-printable
print all(ord(c)<127and c in string.printable for c in input_str)
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参考：http://stackoverflow.com/questions/3636928/test-if-a-python-string-is-printable
print all(ord(c)<127and c in string.printable for c in input_str)
