import re
s = " var1 = 20, var2 = hello var3 =345.34 var4 = I lost 2,5 billions, var5 =Bill"
result = re.split(r",?\s+(?=\w+=)", re.sub(r'\s*=\s*', '=', s.strip()))
print(result)
aW1wb3J0IHJlCnMgPSAiIHZhcjEgPSAyMCwgdmFyMiA9IGhlbGxvIHZhcjMgPTM0NS4zNCB2YXI0ID0gSSBsb3N0IDIsNSBiaWxsaW9ucywgdmFyNSA9QmlsbCIKcmVzdWx0ID0gcmUuc3BsaXQociIsP1xzKyg/PVx3Kz0pIiwgcmUuc3ViKHInXHMqPVxzKicsICc9Jywgcy5zdHJpcCgpKSkKcHJpbnQocmVzdWx0KQo=