Insert a new item before the second element in an existing array - Python:
def insert_num(num_list, new_num):
"""
Insert a new item before the second element in an existing array.
Parameters
----------
num_list : list
The list of numbers.
new_num : int
The new number to insert.
Returns
-------
list
The list of numbers with the new number inserted.
"""
#insert the new number before the second element in the list
num_list.insert(1, new_num)
#return the list of numbers with the new number inserted
return num_list
#example
result = insert_num([1, 2, 3, 4], 99)
#output
print(result) #[1, 99, 2, 3, 4]
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