我无法运行 ipython，当我尝试运行它时出现语法错误

Question

ipython
Traceback (most recent call last):
  File "/home/arvin/.local/bin/ipython", line 5, in <module>
    from IPython import start_ipython
  File "/home/arvin/.local/lib/python3.8/site-packages/IPython/__init__.py", line 55, in <module>
    from .core.application import Application
  File "/home/arvin/.local/lib/python3.8/site-packages/IPython/core/application.py", line 25, in <module>
    from IPython.core import release, crashhandler
  File "/home/arvin/.local/lib/python3.8/site-packages/IPython/core/crashhandler.py", line 27, in <module>
    from IPython.core import ultratb
  File "/home/arvin/.local/lib/python3.8/site-packages/IPython/core/ultratb.py", line 116, in <module>
    from IPython.utils import path as util_path
  File "/home/arvin/.local/lib/python3.8/site-packages/IPython/utils/path.py", line 17, in <module>
    from IPython.utils.process import system
  File "/home/arvin/.local/lib/python3.8/site-packages/IPython/utils/process.py", line 19, in <module>
    from ._process_posix import system, getoutput, arg_split, check_pid
  File "/home/arvin/.local/lib/python3.8/site-packages/IPython/utils/_process_posix.py", line 23, in <module>
    import pexpect
  File "/usr/lib/python3/dist-packages/pexpect/__init__.py", line 75, in <module>
    from .pty_spawn import spawn, spawnu
  File "/usr/lib/python3/dist-packages/pexpect/pty_spawn.py", line 14, in <module>
    from .spawnbase import SpawnBase
  File "/usr/lib/python3/dist-packages/pexpect/spawnbase.py", line 224
    def expect(self, pattern, timeout=-1, searchwindowsize=-1, async=False):
                                                               ^
SyntaxError: invalid syntax

Answer 1

async是用于协程的 python 关键字，因此您不能像变量一样正常使用它。 尝试将该行（应该是程序中的第 224 行）更改为

def expect(self, pattern, timeout=-1, searchwindowsize=-1, async_=False):

Answer 2

安装 Python 3.8 后出现同样的错误

$ ipython
[ . . . ]
def expect(self, pattern, timeout=-1, searchwindowsize=-1, async=False):
                                                               ^
SyntaxError: invalid syntax

按照此答案中的建议升级pexpect为我解决了这个问题：

sudo apt-get remove python-pexpect python3-pexpect

sudo pip3 install --upgrade pexpect