File Sorting in Python

Question

I would like to sort a file in Python based on numerical values:

My input file looks like this:

66135 - A
65117 - B
63301 - C
63793 - D

Answer 1

f2.writelines(sorted(f1, key=lambda line:int(line.split()[0])))

where f2 is your output file and f1 is your input file.