Split a code file into smaller ones ...e.g you have a python file that has multiple classes ..and for easier studying you want to split it.

split.py

matches = ["class", "(", ":"]
with open("sailor.py") as f:
    lines = f.readlines()
    currentclassname = ''
    currentlines =[]
    for line in lines :
        if all(x in line for x in matches) : # we have found a class
            classname = line.split(" ", 2)[1].split("(",1)[0]
            print(classname)
            currentclassname=classname
            if len(currentclassname):
                with open(classname+'.py', 'a') as the_file:
                    the_file.write(line)
        else:
            if len(currentclassname):
                with open(currentclassname+'.py', 'a') as the_file:
                    the_file.write(line)
            else:
                with open('_initial.py', 'a') as the_file:
                    the_file.write(line)