Python 类型错误：传递给 list.__format__ 的格式字符串不受支持

TypeError: unsupported format string passed to list.__format__

提问by rabin senchuri

I have two list named results and p_results. I want to show those list values in table like if

我有两个名为 results 和 p_results 的列表。我想在表中显示这些列表值，如

results = [1,2,3,4]
p_results = [5,6,7,8]

I want something like this

我想要这样的东西

1     5
2     6
3     7
4     8

        print('{:3}{:20}'.format(results, p_results))

running the code:

运行代码：

runfile('D:/4/2d.py', wdir='D:/4')
Traceback (most recent call last):

  File "<ipython-input-59-1abb0c96f0c0>", line 1, in <module>
    runfile('D:/4/2d.py', wdir='D:/4')

  File "C:\Users\Rabinsen\Anaconda3\lib\site-packages\spyder_kernels\customize\spydercustomize.py", line 668, in runfile
    execfile(filename, namespace)

  File "C:\Users\Rabinsen\Anaconda3\lib\site-packages\spyder_kernels\customize\spydercustomize.py", line 108, in execfile
    exec(compile(f.read(), filename, 'exec'), namespace)

  File "D:/4/2d.py", line 61, in <module>
    print('{:3}{:20}'.format(results, p_results))

TypeError: unsupported format string passed to list.__format__

回答by Jean-Fran?ois Fabre

You can pass a listtype to format(using just {}), but the formatting you requested isn't available. And the standard formatting isn't suited anyway, so...

您可以将list类型传递给format（仅使用{}），但您请求的格式不可用。无论如何，标准格式都不适合，所以......

What you want is each list on one separate column. You'll have to ziplists together, and iterate on the result to pass it to format:

你想要的是一个单独的列上的每个列表。您必须将zip列表放在一起，并迭代结果以将其传递给格式：

results = [1,2,3,4]
p_results = [5,6,7,8]

for result,p_result in zip(results,p_results):
    print('{:3}{:20}'.format(result,p_result))

That prints something like:

这会打印如下内容：

  1                   5
  2                   6
  3                   7
  4                   8

回答by Istvan

One trick is to solve this:

一个技巧是解决这个问题：

'{:15}'.format('{}'.format([1,2,3]))

回答by LeninGF

I would recommend that you use Pandas library for that purpose

我建议您为此目的使用 Pandas 库

import pandas as pd
results = [1,2,3,4]
p_results = [5,6,7,8]
d = {'column-1':results, 'column-2':p_results}
data_frame = pd.DataFrame(data=d)
print(data_frame)
   column-1  column-2
0         1         5
1         2         6
2         3         7
3         4         8

Notice that you have an index using data frame object

请注意，您有一个使用数据框对象的索引

Also you can make new columns an operations, like for instance let us create a third column to store the product of column-1 and column-2

您也可以使新列成为一项操作，例如让我们创建第三列来存储第 1 列和第 2 列的乘积

data_frame['product'] = data_frame['column-1']*data_frame['column-2']

The result you get now printing is:

您现在打印的结果是：

   column-1  column-2  product
0         1         5        5
1         2         6       12
2         3         7       21
3         4         8       32

Hope this helps! Happy coding!

希望这可以帮助！快乐编码！

回答by vash_the_stampede

Did you try print('{},{}'.format(results[:3], p_results[:20]))

你试过了吗 print('{},{}'.format(results[:3], p_results[:20]))

The way you structured your printlike looks like a combination of two styles,

你构建你print喜欢的方式看起来像是两种风格的组合，

print(f'{results[:3]}, {p_results[:20]}')

print(f'{results[:3]}, {p_results[:20]}')

and

和

print('{}, {}'.format(results[:3], p_results[:20]))

print('{}, {}'.format(results[:3], p_results[:20]))

Your attempt is

你的尝试是

print('{:3}, {:20}'.format(results, p_results))

print('{:3}, {:20}'.format(results, p_results))

This is the root of your error, here in example reproducing same error:

这是错误的根源，在示例中重现相同的错误：

>>> a = [1, 2, 3]
>>> print('{:1}'.format(a))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unsupported format string passed to list.__format__

>>> print('{}'.format(a[:1]))
[1]