day04-python character formatted output, for loop, break statement, while

A character formatted output

　　Placeholder% s s = string

　　　　　　   % D d = digit integer

　　　　           % F f = float float, is approximately equal to the fractional

       

Two, for circulation

1, the first implementation of registration for circulation

2, a more concise manner

3, while loop implemented:

while conditions:

After a while when the condition is True, the following code will execute

4、break，continue

      break out of the entire current loop

      continue the end of this cycle, the next cycle continues