built-in function eval
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1. string into a list
a = "[[1,2],[3,4]]"
print(type(a))
b = eval(a)
c = list(a)
print(type(b))
print(type(c))
print(b)
print(c)
2. string into a dictionary
a = "{1:'a',2:'b'}"
print(type(a))
b = dict(eval(a))
print(type(b))
print(b)
3. convert a string known as a tuple
a='([1,2],[3,4])'
print(type(a))
b = eval(a)
print(b)
