用户在python中输入的多维数组 [英] Multidimensional array by user input in python

问题描述

我使用了 Jupyter 笔记本，我是 Python 新手，我尝试从多维数组中的用户获取值，我该怎么做?我写了一些代码，在输入第一个值后我得到了我不明白的错误

错误:

<块引用>

回溯(最近一次调用最后一次)<ipython-input-64-4d8986a5e412>在<模块>5 for i in range(lengthrow):6 for j in range(lengthcol):---->7 arr[i][j]=int(input("输入值"))8 打印(arr)

IndexError: 索引 0 超出轴 0 的范围，大小为 0

代码:

from numpy import*arr = 数组([[],[]])lengthrow=int(input("输入数组行长度"))lengthcol=int(input("输入数组col长度"))对于我在范围内(lengthrow):对于范围内的 j(lengthcol):arr[i][j]=int(input("输入值"))打印(arr)

解决方案

我接受了@Austin 很好的回答并做了一些小改动:

将 numpy 导入为 npn_rows = int(input("请输入行数:"))n_cols = int(input("请输入列数:"))arr = [[int(input("Enter value for {}.row and {}.column: ".format(r + 1, c + 1))) for c in range(n_cols)] for r in range(n_rows))]打印(np.array(arr))

输出为:

输入行数:2输入列数:3输入 1. 行和 1. 列的值:1输入 1. 行和 2. 列的值:2输入 1. 行和 3. 列的值:3输入 2. 行和 1. 列的值:4输入 2. 行和 2. 列的值:5输入 2. 行和 3. 列的值:6[[1 2 3][4 5 6]]

您遇到了异常，因为您初始化了一个空数组并使用了无效索引.有了这个答案，您就可以在输入用户输入后生成数组.

<小时>

这是单行代码的长版本 (arr = [[...)，它给你相同的结果:

outer_arr = []对于范围内的 r(n_rows):内部_arr = []对于范围内的 c(n_cols):num = int(input("输入 {}.row 和 {}.column 的值:".format(r + 1, c + 1)))inner_arr.append(num)external_arr.append(inner_arr)打印(np.array(outer_arr))

I used Jupyter notebook, I am new to Python, I try to fetch value from user in multidimensional array how I do that? I write a little code, after put first value I get error that I don't understand

Error:

Traceback (most recent call last)
   <ipython-input-64-4d8986a5e412> in <module>
          5 for i in range(lengthrow):
          6     for j in range(lengthcol):
    ----> 7         arr[i][j]=int(input("enter value"))
          8 print(arr)

IndexError: index 0 is out of bounds for axis 0 with size 0

code:

from numpy import*
arr = array([[],[]])
lengthrow=int(input("enter array row length"))
lengthcol=int(input("enter array col length"))
for i in range(lengthrow):
    for j in range(lengthcol):
        arr[i][j]=int(input("enter value"))
print(arr)

解决方案

I took @Austin great answer and made some little changes:

import numpy as np

n_rows = int(input("Enter number of rows: "))
n_cols = int(input("Enter number of columns: "))

arr = [[int(input("Enter value for {}. row and {}. column: ".format(r + 1, c + 1))) for c in range(n_cols)] for r in range(n_rows)]

print(np.array(arr))

The output is:

Enter number of rows: 2
Enter number of columns: 3
Enter value for 1. row and 1. column: 1
Enter value for 1. row and 2. column: 2
Enter value for 1. row and 3. column: 3
Enter value for 2. row and 1. column: 4
Enter value for 2. row and 2. column: 5
Enter value for 2. row and 3. column: 6
[[1 2 3]
 [4 5 6]]

You got an exception, because you initialized an empty array and used invalid indices. With this answer you generate the array after you have entered the users input.

---

Here is the long version of the one-liner (arr = [[...) which gives you the same result:

outer_arr = []
for r in range(n_rows):
    inner_arr = []
    for c in range(n_cols):
        num = int(input("Enter value for {}. row and {}. column: ".format(r + 1, c + 1)))
        inner_arr.append(num)
    outer_arr.append(inner_arr)

print(np.array(outer_arr))

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