如何在 ptpython 控制台中读取历史记录?

Question

我一直在尝试弄清楚如何在ptpython控制台中保存和读取我的 Python 命令的历史记录，但一直无法做到这一点。到目前为止，我所有的努力都是这个答案的变体。但是，我仍然无法阅读我的历史。

我只是希望能够按↑和↓箭头来浏览上一个控制台会话(而不是我所在的当前控制台会话(中的 Python 命令。以下是我目前在$PYTHONSTARTUP文件中的内容：

# Add auto-completion and a stored history file of commands to your Python
# interactive interpreter. Requires Python 2.0+, readline. Autocomplete is
# bound to the Esc key by default (you can change it - see readline docs).
#
# Store the file in ~/.pystartup, and set an environment variable to point
# to it:  "export PYTHONSTARTUP=/home/user/.pystartup" in bash.
#
# Note that PYTHONSTARTUP does *not* expand "~", so you have to put in the
# full path to your home directory.
import atexit
import os
import readline
import rlcompleter
import sys
try:
from ptpython.repl import embed
except ImportError:
print('ptpython is not available: falling back to standard prompt')
else:
sys.exit(embed(globals(), locals()))
historyPath = os.path.expanduser("~/.ptpython/history")
def save_history(historyPath=historyPath):
import readline
readline.write_history_file(historyPath)
if os.path.exists(historyPath):
readline.read_history_file(historyPath)
atexit.register(save_history)
readline.parse_and_bind('tab: complete')
del os, atexit, readline, rlcompleter, save_history, historyPath

我的$PYTHONSTARTUP变量是：

$ echo $PYTHONSTARTUP 
/Users/[redacted]/.pystartup

我使用的是Python 3.7.3，macOS 10.14.6和ptpython 2.0.4。

谢谢

Answer 1

如果您检查嵌入的源代码，则会看到选项history_filename=

embed(globals(), locals(), history_filename=historyPath)

<小时 />

import os
try:
from ptpython.repl import embed
except ImportError:
print('ptpython is not available: falling back to standard prompt')
else:
history_path = os.path.expanduser("~/.ptpython/history")
embed(globals(), locals(), history_filename=history_path)

---

BTW：如果文件夹~/.ptpython不存在，则必须在运行代码之前创建它。

编辑 (2022(：

import os
try:
from ptpython.repl import embed
except ImportError:
print('ptpython is not available: falling back to standard prompt')
else:
history_dir  = os.path.expanduser("~/.ptpython")
history_path = os.path.join(history_dir, "history")

if not os.path.exists(history_path):
os.makedirs(history_dir, exist_ok=True)  # create folder if not exist
open(history_path, 'a').close()          # create empty file

embed(globals(), locals(), history_filename=history_path)