text: # 类型转换
  
  a = 100
  b = str(a)
  c = 12.345
  d = str(c)
  e = '123'
  f = int(e)
  g = '123.456'
  h = float(g)
  i = False
  j = str(i)
  k = 'hello'
  m = bool(k)
  print(a)
  print(type(a))
  print(b)
  print(type(b))
  print(c)
  print(type(c))
  print(d)
  print(type(d))
  print(e)
  print(type(e))
  print(f)
  print(type(f))
  print(g)
  print(type(g))
  print(h)
  print(type(h))
  print(i)
  print(type(i))
  print(j)
  print(type(j))
  print(k)
  print(type(k))
  print(m)
  print(type(m))