我正在阅读《学习Python的艰难方法》这本书,我在exc13上。练习如下:
from sys import argv
# read the WYSS section for how to run this
script, first, second, third = argv
print("The script is called:", script)
print("Your first variable is:", first)
print("Your second variable is:", second)
print("Your third variable is:", third)
但是当我运行它时,出现以下错误
---------------------------------------------------------------------------
ValueError Traceback (most recent call last)
<ipython-input-16-b23ff5448130> in <module>()
1 from sys import argv
2 # read the WYSS section for how to run this
----> 3 script, first, second, third = argv
4
5 print("The script is called:", script)
ValueError: not enough values to unpack (expected 4, got 3)
这是因为argv未填充。该书说使用终端,您可以在终端中输入以下内容来传递参数:
python ex13.py first 2nd 3rd
在终端。但是我怎么只能用Jupyter笔记本来做到这一点。
在Jupyter Notebook中,您可以使用cell magic创建文件%%file
。然后,您可以使用cell magic将命令发送到外壳以运行文件%%!
。
要写出文件:
%%file ex13.py
from sys import argv
# read the WYSS section for how to run this
script, first, second, third = argv
print("The script is called:", script)
print("Your first variable is:", first)
print("Your second variable is:", second)
print("Your third variable is:", third)
要运行文件:
%%!
python ex13.py first 2nd 3rd
您应该看到想要的结果。捕获打印的输出并作为列表返回,每个打印行一个元素。
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