ValueError: must have exactly one of create/read/write/append mode
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ValueError: must have exactly one of create/read/write/append mode
fo = open(‘runoob.txt‘, ‘rw+‘)
python 中文件打开操作的mode中没有“rw”
合法的mode有：
r、rb、r+、rb+、w、wb、w+、wb+、a、ab、a+、ab+
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