作用一:
①将字符串转化成列表
a = "[[1,2],[3,4]]" b = eval(a) print(b) >>>[[1:2],[3:4]]
②将字符串转化成字典
a = "{'name':'wangfuyan','age':'21'}" print(a) print(type(a)) b =eval(a) print(type(b)) >>>{'name':'wangfuyan','age':'21'}
③将字符串转化成元祖
a = "([1,2],[3,4],[5,6])" print(a) print(type(a)) b = eval(a) print(b) print(type(b)) >>>([1,2],[3,4],[5,6])