fakepdb

fakepdb.py

import sys

def main():
    myvar = 'hello'
    print('this is line 5')
    print('this is line 6')
    print('this is line 7')
    print('this is line 8')
    print('this is line 9')


def fakepdb(frame, event, arg):
    if event == 'line':
        print('      about to execute line', frame.f_lineno)
        if frame.f_lineno == 7:
            print('welcome to fakepdb: type "c" to continue, or the name of '
                  'a variable to print it')
            while True:
                cmd = input('(fakepdb) ')
                if cmd == 'c':
                    break
                else:
                    v = frame.f_locals.get(cmd, f'variable {cmd} not found')
                    print(v)
    return fakepdb # continue tracing

if __name__ == '__main__':
    sys.settrace(fakepdb)
    main()