Round the float after converting from string till second last entry in a list

Question

Assume we have a list:

list_t = ['1.234', '3.6654', '7.134123', '2.2323', 'Someone']

our operation should change the above list of string to float value with rounding the float value till 2 points except the last string.

expected output will be:

list_t = [1.23, 3.67, 7.13, 2.23, 'Someone']

Answer 1

If the string is always present in the last index, you can use this simple list comprehension:

list_t = ['1.234', '3.6654', '7.134123', '2.2323', 'Someone']

list_t = [round(float(num),2) for num in list_t[:-1]] + [list_t[-1]]

print(list_t)

Output:

[1.23, 3.67, 7.13, 2.23, 'Someone']

If the string can be at any position, you don't have to use a try-except block or something. You can use this list comprehension:

list_t = ['1.234', '3.6654', '7.134123', '2.2323', 'Someone']

list_t = [round(float(num),2) if num.replace('.', '', 1).isdigit() else num for num in list_t]

print(list_t)

Output:

[1.23, 3.67, 7.13, 2.23, 'Someone']