[Python] convert string which contains sub string to dictionary

I am tring to convert particular strings which are in particular format to Python dictionary. String format is like below,

st1 = 'key1 key2=value2 key3="key3.1, key3.2=value3.2 , key3.3 = value3.3, key3.4" key4'


I want to parse it and convert to dictionary as below,

dict1 {
key1: None,
key2: value2,
key3: {
key3.1: None,
key3.2: value3.2,
key3.3: value3.3,
key3.2: None
}
key4: None,



I tried to use python re package and string split function. not able to acheive the result. I have thousands of string in same format, I am trying to automate it. could someone help.

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