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_pyrepl: IndexError in max_column when recalling a very long single-line history entry #159617
Description
Bug report
Bug description
On CPython 3.14.6, the default REPL (_pyrepl) crashes with IndexError when recalling a very long single-line history entry and then pressing Down repeatedly.
This reproduces with plain ASCII.
Minimal reproducer
- Launch a narrow xterm:
xterm -geometry 20x10- In the Python REPL, enter a very long single line (1000
acharacters on one line), e.g.:
a = """
aaaa... (1000 a's, single line)
"""- Press Up several times, then press Down repeatedly.
Traceback
Traceback (most recent call last):
File ".../_pyrepl/readline.py", line 395, in multiline_input
return reader.readline()
File ".../_pyrepl/reader.py", line 759, in readline
self.handle1()
File ".../_pyrepl/reader.py", line 742, in handle1
self.do_cmd(cmd)
File ".../_pyrepl/reader.py", line 667, in do_cmd
command.do()
File ".../_pyrepl/commands.py", line 299, in do
new_x := r.max_column(new_y)
File ".../_pyrepl/reader.py", line 463, in max_column
return self.screeninfo[y][0] + sum(self.screeninfo[y][1])
IndexError: list index out of range
CPython versions tested on:
3.14
Operating systems tested on:
Linux
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