Python解包错误需要更多值才能解包

Question

我运行以下代码：

from sys import argv

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

但是当我运行它的时候，我得到了这个错误：

ValueError: need more than 1 value to unpack

Answer 1

script, first, second, third = argv将argv (必须包含4项)“解包”到相应的变量中。显然，您没有将这3个参数传递给您的脚本。

试着这样检查一下：

if len(argv) == 4:
    script, first, second, third = argv
else:
    print "Not enough arguments"

Answer 2

这意味着您没有为python脚本提供足够的参数。此错误意味着您尝试解压的值多于列表中的值。像python file.py a b c一样运行它。

尝试以下代码：

if len(argv) == 4:
    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
else:
    print "Not enough arguments"