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Python Python Basics (2015) Logic in Python Around and Around

Mengqi Liu
Mengqi Liu
875 Points
Posted by Mengqi Liu
Mengqi Liu
875 Points

While Loop: example Countdown

countdown = 5 while countdown: ... print(countdown) ... countdown -= 1 ...print ("happy new year") File "<stdin>", line 4 print("happy new year!") SyntaxError: invalid syntax

so if I want to have a happy new year appears immediately after the countdown " 54321 happy new year", so where should I put 'print("happy new year")'??? How can I deal with the syntaxerror? Thanks a lot.

4 Answers

Bryan Dobberstein
Bryan Dobberstein
16,361 Points
Bryan Dobberstein
Bryan Dobberstein
16,361 Points

Only the two lines within the while loop should be indented. The rest should not.

countdown = 5

while (countdown != 0):
  print(countdown)
  countdown -= 1

print("Happy New Year")
furkan
furkan
11,733 Points
furkan
furkan
11,733 Points 
countdown = 5

while (countdown != 0):
  print(countdown)
  countdown -= 1

  if (countdown == 0):
    print("Happy New Year")

Hope this helps.

Bryan Dobberstein
Bryan Dobberstein
16,361 Points
Bryan Dobberstein
Bryan Dobberstein
16,361 Points

You really don't need the if statement.

countdown = 5

while (countdown != 0):
  print(countdown)
  countdown -= 1

print("Happy New Year")
Mengqi Liu
Mengqi Liu
875 Points
Mengqi Liu
Mengqi Liu
875 Points

hi, thanks for the code. It works, I just need to pay attention to the indentations.

furkan
furkan
11,733 Points
furkan
furkan
11,733 Points

Yes i think you are right. I am confusing the JS syntax with python

Bryan Dobberstein
Bryan Dobberstein
16,361 Points
Bryan Dobberstein
Bryan Dobberstein
16,361 Points

Only one way to tell, run it. I wouldn't have posted if I hadn't tested it first.

Mengqi Liu
Mengqi Liu
875 Points
Mengqi Liu
Mengqi Liu
875 Points 
          <p>countdown = 5
                while(countdown != 0) :
                     print(countdown)
                     countdown -=1
                print("Happy New Year")</p>
          ```

I still can't get it, why it shows that for the last line, there is an invalid syntax. 
How can you separate print("Happy New Year") from the block above? and I am really bad at the indentations. 
Thanks.