input: Write a function to print the Fibonacci series up to a given number of terms. If the given number of terms is less than or equal to 0, print "Invalid input".
  
  def printFibonacciSeries(n): 
      if n <= 0:
          print("Invalid input")
          return
      
      f1 = 0
      f2 = 1
      print(f1, f2, end = " ") 
    
      for i in range(2, n): 
          next = f1 + f2 
          print(next, end = " ") 
          f1 = f2 
          f2 = next
  
  assert printFibonacciSeries(5)=="0 1 1 2 3 "
  assert printFibonacciSeries(10)=="0 1 1 2 3 5 8 13 21 34 "
  assert printFibonacciSeries(0)=="Invalid input"
  assert printFibonacciSeries(-3)=="Invalid input"
  assert printFibonacciSeries(1)=="0 "
output: def printFibonacciSeries(n): 
      if n <= 0:
          print("Invalid input")
          return
      
      f1 = 0
      f2 = 1
      print(f1, f2, end = " ") 
    
      for i in range(2, n): 
          next = f1 + f2 
          print(next, end = " ") 
          f1 = f2 
          f2 = next