# Learn Data Structures by Building the Merge Sort Algorithm - Step 33

### Tell us what’s happening:

Describe your issue in detail here.
Hi team, the platform does not let my code pass. The code seems fine and the print statement is deindented.

``````def merge_sort(array):
if len(array) <= 1:
return

middle_point = len(array) // 2
left_part = array[:middle_point]
right_part = array[middle_point:]

merge_sort(left_part)
merge_sort(right_part)

left_array_index = 0
right_array_index = 0
sorted_index = 0

while left_array_index < len(left_part) and right_array_index < len(right_part):
if left_part[left_array_index] < right_part[right_array_index]:
array[sorted_index] = left_part[left_array_index]
left_array_index += 1
else:
array[sorted_index] = right_part[right_array_index]
right_array_index += 1
sorted_index += 1

while left_array_index < len(left_part):
array[sorted_index] = left_part[left_array_index]
left_array_index += 1
sorted_index += 1

while right_array_index < len(right_part):
array[sorted_index] = right_part[right_array_index]
right_array_index += 1
sorted_index += 1

# User Editable Region

if __name__ == '__main__':
numbers = [4, 10, 6, 14, 2, 1, 8, 5]
print('Unsorted array: ')
print(numbers)
merge_sort(numbers)
print(concat('Sorted array: ', str(numbers)))

# User Editable Region

``````

User Agent is: `Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36 Edg/120.0.0.0`

### Challenge Information:

Learn Data Structures by Building the Merge Sort Algorithm - Step 33
https://www.freecodecamp.org/learn/scientific-computing-with-python/learn-data-structures-by-building-the-merge-sort-algorithm/step-33`Preformatted text`

You appear to have created this post without editing the template. Please edit your post to Tell us what’s happening in your own words.

Hello!

• “concat()” is used in the Pandas library for combining data frames, in everyday Python that’s done with “+”

• line needs to be part of the if statement block

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