text: import numpy as np
  
  
  def main():
      # pass
      test5()
  
  
  def test1():
      n = 1234567890.123456789012345
      "{:.9e}".format(n)
      print(n)
  
  
  def test2():
      a = np.array([2, 4, 6, 8, 10])
      b = np.where(a > 5, None)  # 返回索引
      print(b)
  
  
  def test3():
      for a in range[0, 10]:
          b += a
          print(a)
  
  
  def test4():
      foo4_1("aaa")
  
  
  def foo4_1(a):
      foo4_1(a, "123")
  
  
  def foo4_1(a, b):
      print(a)
      print(b)
  
  
  def test5():
      a, b = test5_1()
      print(a)
      print(b)
  
  
  def test5_1():
      return "123", 18
  
  
  if __name__ == '__main__':
      main()
  