摘要： >>> a={x for x in 'abkckldlk' if x not in 'adc'} //求字符串中除去‘adc’字符的字符串，输出为set()类型>>> a{'l', 'k', 'b'} >>> a=[x for x in 'dkjfl ss' if x not in 'sl'] // 阅读全文