Several ways to convert python strings into variables

Turn from: http://blog.chinaunix.net/uid-20393955-id-345573.html

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Here are 3 ways in which the strings in Python are converted to variables, and if there is a way, please point out, thank you.

var = "This is a string"
VarName = ' var '
s= locals () [VarName]
S2=vars () [VarName]

Print S
Print S2
Print eval (varName)