eval eval函数就是实现list、dict、tuple与str之间的转化str函数把list，dict，tuple转为为字符串 # 字符串转换成列表 a = "[[1,2], [3,4], [5,6], [7,8], [9,0]]" print(type(a)) b = eval(a) print(b)

# 字符串转换成字典 a = "{1: 'a', 2: 'b'}" print(type(a)) b = eval(a) print(type(b)) print(b)

# 字符串转换成元组 a = "([1,2], [3,4], [5,6], [7,8], (9,0))" print(type(a)) b=eval(a) print(type(b)) print(b)