t.sort(key=lambda x : ord(x[0]) if type(x[0]) == str else x[0])

This line of code sorts a list of strings and/or integers named "t" based on the ASCII value of their first character.

The lambda function used as the key parameter takes each element in the list "t" and checks if its first character is a string or an integer. If it's a string, it returns the ASCII value of the first character using the ord() function. If it's an integer, it directly returns the value of the first element.

The sort() method then uses this lambda function to compare and sort the elements in "t" based on the values returned by the lambda function.

After this line of code is executed, the list "t" will be sorted in ascending order based on the ASCII value of the first character of each element.