#计算字符串中有效的表达式 print(eval('pow(2,2)')) print(eval('2+2')) #将字符串转成相应的对象(如list、tuple、dict和string之间的转换) a="[[1,2], [3,4], [5,6], [7,8], [9,0]]" b="(1,2,3,4)" c="{1:'xx',2:'yy'}" print(eval(a)) print(eval(b)) print(eval...
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