python3 RuntimeError: dictionary changed size during iteration
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python3 RuntimeError: dictionary changed size during iteration
python2 keys 先对字典进行 copy，从而在修改字典时，也能进行迭代
headerTable = {}minSup = 1 for k in headerTable.keys(): if headerTable[k] < minSup: del(headerTable[k])python3
Python 3.x 的 keys 返回的是iterator 而非列表，导致当修改字典时，无法迭代。所以，可以使用list 强制将字典进行copy，转换成列表。
headerTable = {}minSup = 1 for k in list(headerTable): if headerTable[k] < minSup: del(headerTable[k])How to avoid “RuntimeError: dictionary changed size during iteration” error?
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