my_string = 'voltage is E=200V and the current is I=4.5A'
# Assuming you are working with the hard coded index
voltage = float(my_string[13:16])
current = float(my_string[39:42])
print(voltage, current)
bXlfc3RyaW5nID0gJ3ZvbHRhZ2UgaXMgRT0yMDBWIGFuZCB0aGUgY3VycmVudCBpcyBJPTQuNUEnCiAKIyBBc3N1bWluZyB5b3UgYXJlIHdvcmtpbmcgd2l0aCB0aGUgaGFyZCBjb2RlZCBpbmRleAp2b2x0YWdlID0gZmxvYXQobXlfc3RyaW5nWzEzOjE2XSkKIApjdXJyZW50ID0gZmxvYXQobXlfc3RyaW5nWzM5OjQyXSkKIApwcmludCh2b2x0YWdlLCBjdXJyZW50KQ==