class Log:
def __init__(self):
self.last_data = ""
def print_max5(self, data):
self.last_data = data
# A slice never fails past the end
data = data[:5]
print(data)
log = Log()
log.print_max5("1234567")
# prints "12345"
print(f"{log.last_data = }")
log.print_max5("123")
# prints "123"