line_profiler завершается ошибкой с ZeroDivisionError

Question

Я пытаюсь профилировать код Python 2.7 с line_profiler, но я получаю следующую ошибку:

$ kernprof -l -v mult_table.py
     1   2   3   4
 1   1   2   3   4
 2   2   4   6   8
 3   3   6   9  12
 4   4   8  12  16
 5   5  10  15  20
 6   6  12  18  24
 7   7  14  21  28
 8   8  16  24  32
 9   9  18  27  36
10  10  20  30  40
11  11  22  33  44
12  12  24  36  48
13  13  26  39  52
14  14  28  42  56
15  15  30  45  60

   1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 21
1  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 21
2  2  4  6  8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42
3  3  6  9 12 15 18 21 24 27 30 33 36 39 42 45 48 51 54 57 60 63
Wrote profile results to mult_table.py.lprof
Timer unit: 1e-06 s

Total time: 0 s
File: mult_table.py
Function: print_header at line 4
Traceback (most recent call last):
  File "/bin/kernprof", line 11, in <module>
    sys.exit(main())
  File "/usr/lib/python2.7/site-packages/kernprof.py", line 230, in main
    prof.print_stats()
  File "/usr/lib/python2.7/site-packages/line_profiler.py", line 117, in print_stats
    show_text(lstats.timings, lstats.unit, stream=stream, stripzeros=stripzeros)
  File "/usr/lib/python2.7/site-packages/line_profiler.py", line 227, in show_text
    show_func(fn, lineno, name, stats[fn, lineno, name], unit, stream=stream, stripzeros=stripzeros)
  File "/usr/lib/python2.7/site-packages/line_profiler.py", line 201, in show_func
    '%5.1f' % (100*time / total_time))
ZeroDivisionError: float division by zero

Что я могу сделать, чтобы заставить line_profiler работать?

Код Python:

$ cat mult_table.py
#!/usr/bin/env python


@profile
def print_header(n, digits_m):
    spaces = digits_m + 1
    print("%*s" % (digits_m, " ")),
    for i in range(1, n+1):
        print("%*d" % (spaces, i)),
    print


@profile
def print_mult_table(n, m):
    digits_n = len(str(n))
    digits_m = len(str(m))
    spaces_m = digits_m + 1
    print_header(n, digits_m)
    for j in range(1, m+1):
        print("%*d" % (digits_m, j)),
        for k in range(1, n+1):
            print("%*d" % (spaces_m, k*j)),
        print


if __name__ == "__main__":
    n = 4
    m = 15
    print_mult_table(n, m)
    print
    n = 21
    m = 3
    print_mult_table(n, m)