[Python] Converting a string into a list in Python

I have a text document that contains a list of numbers and I want to convert it to a list. Right now I can only get the entire list in the 0th entry of the list, but I want each number to be an element of a list. Does anyone know of an easy way to do this in Python?

1000
2000
3000
4000


to

['1000','2000','3000','4000']

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