Jupyter Notebook中的Argparse引发TypeError [英] Argparse in Jupyter Notebook throws a TypeError

问题描述

在Jupyter Notebook中使用argparse会引发TypeError.如果我执行与脚本相同的代码，则相同的代码可以正常工作. MWE:

Using argparse in a Jupyter Notebook throws a TypeError. The same code works fine if I execute the same code as a script. MWE:

import argparse

parser = argparse.ArgumentParser(description='Foo')
parser.add_argument('--name', '-n', default='foo', help='foo')

args = parser.parse_args()

结果:

TypeError: 'level' is an invalid keyword argument for this function

推荐答案

Ipython在后台运行一些命令行参数.这会干扰argparse和optparse.

Ipython is running some command-line arguments in the background. This interfers with argparse and optparse.

请参见针对Spyder的错误(Ipython IDE)，其中被添加为命令选项，并且由于没有-f的处理程序而崩溃.

See this bug for Spyder (Ipython IDE), where -f was being added as a command option and crashing as there was no handler for -f.

您可以尝试检查当前正在播放的参数(就像对Spyder错误所做的一样)，并放置一个虚拟处理程序.

You could try checking the arguments currently in play (as they did for the Spyder bug) and putting a dummy handler in place.

运行

import sys
print(sys.argv)

在Ipython内部，查看其输出.

inside Ipython and see what it outputs.

在我的系统上，它显示

['/usr/lib/python3.6/site-packages/ipykernel_launcher.py'，'-f'，'/run/user/1000/jupyter/kernel-7537e4dd-b5e2-407c-9d4c-7023575cfc7c. json']

['/usr/lib/python3.6/site-packages/ipykernel_launcher.py', '-f', '/run/user/1000/jupyter/kernel-7537e4dd-b5e2-407c-9d4c-7023575cfc7c.json']

Argparse假定第一个条目是程序名称(sys.argv[0]).为了解决这个问题，我不得不打电话

Argparse assumes the first entry is the program name (sys.argv[0]). In order to fix this, I had to call

parser = argparse.ArgumentParser(prog='myprogram', description='Foo')

...，现在argparse可以在我的笔记本中使用.

... and now argparse works in my notebook.

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