[Python tutorial] 17. Try...Except

Try Except

• try: 에러 발생 확인을 위한 테스트. 에러가 생겼을 때 'exception' 호출
• except: 에러 발생한 경우의 실행문
• else: 에러가 없을 경우 실행문
• finally: 에러 발생 유무에 관계없이 실행

try:
  print("Hello")
except:
  print("Something went wrong")
else:
  print("Nothing went wrong")
Finally

try:
  f = open("demofile.txt")
  try:
    f.write("Lorum Ipsum")
  except:
    print("Something went wrong when writing to the file")
  finally:
    f.close()
except:
  print("Something went wrong when opening the file")

Raise an exception

x = -1

if x < 0:
  raise Exception("Sorry, no numbers below zero")

x = "hello"

if not type(x) is int:
  raise TypeError("Only integers are allowed")