linecache_demo.3.py

# replace exception hook
import sys
from traceback import print_exception
sys.excepthook = print_exception

# meddle with a code line using linecache
import linecache
lineno = 423
fname = "/home/ofer/Sources/easypy/easypy/collections.py"

linecache.getline(fname, lineno)
size, mtime, lines, fullname = linecache.cache[fname]
lines[lineno - 1] = "NOTHING TO SEE HERE, PLEASE MOVE ALONG..."

# run some code that fails
from easypy.collections import ListCollection
lc = ListCollection()
lc.pop_some(1)

# Voila
Traceback (most recent call last):
  File "./traceback_demo.py", line 18, in <module>
    lc.pop_some(1)
  File "/home/ofer/Sources/easypy/easypy/collections.py", line 481, in pop_some
    sample_size = self._choose_sampling_size(minimum, maximum)
  File "/home/ofer/Sources/easypy/easypy/collections.py", line 423, in _choose_sampling_size
    NOTHING TO SEE HERE, PLEASE MOVE ALONG...
  File "/usr/lib/python3.8/random.py", line 248, in randint
    return self.randrange(a, b+1)
  File "/usr/lib/python3.8/random.py", line 226, in randrange
    raise ValueError("empty range for randrange() (%d, %d, %d)" % (istart, istop, width))
ValueError: empty range for randrange() (1, 1, 0)