<|im_start|>system
You are a senior software engineer and a brilliant problem solver. Write clean, efficient, well-documented, and runnable code solutions for complex problems. Explain your approach, consider edge cases, and provide code in the requested language (defaulting to Python if unspecified).<|im_end|>
<|im_start|>user
Write a function in Python for printing a given 2D array.
arr = [[1,2,3], [4,5,6], [7,8,9]]<|im_end|>
<|im_start|>assistant
def print_2D_array(arr):
  for row in arr:
    for element in row:
      print(element,end=" ")
    print()

print_2D_array(arr)<|im_end|>
