Question

#turns the text file into a list with each coordinates on a seperate line.
with open('AV.txt', 'r') as file:
    file_data = file.read()
file_data = file_data.replace('],', ']\n')
with open('AV.txt', 'w') as file:
    file.write(file_data)

#puts the vertices into an array
array = []
with open('AV.txt') as f:
    for line in f:
        array.append(line.strip("\n"))

#individual vertices according to their axis
x_array = [i[1] for i in array]
y_array = [i[7] for i in array]
z_array = [i[13] for i in array]

#Finds the maximum, minimum, and median for the x vertices
max_x = -1000000000000
min_x = 1000000000000
x_array_sorted = sorted(x_array)
length_x_array = len(x_array_sorted)
half_point_x = length_x_array//2
median_x = x_array_sorted[half_point_x]

n = 0
for q in x_array:
    if float(x_array[n]) > float(max_x):
        max_x = x_array[n]
    if float(x_array[n]) < float(min_x):
        min_x = x_array[n]
    n = n + 1

当我运行此代码时，出现此值错误

ValueError: could not convert string to float: '-'.

何时到达

if float(x_array[n]) > float(max_x):

我不知道如何使我的代码接受某些坐标为负数，因此在它们前面加一个“-”。有任何想法吗？谢谢。

正在打开并读取的文件中的示例文本行：[27.36，-31.24，26.03]

Answer 1

要解决您遇到的问题，您只需将列表推导转换为整数即可。

#individual vertices according to their axis
x_array = [int(i[1]) for i in array]
y_array = [int(i[7]) for i in array]
z_array = [int(i[13]) for i in array]

上面的代码遍历array 3次以创建三个列表项。我建议您将其转换为这样的单个循环。

for i in array:
    x_array.append(int(i[1])
    y_array.append(int(i[7])
    z_array.append(int(i[13])

此外，我是否建议您通过处理内存中的值来最小化I / O。

例如：您可以将以下代码更改为更少的行：

如果file_data是您从AV.txt中读取的信息，那么下面的三行代码将为您提供所需的列表。

file_data = '[1, 2, 3, 4, 5][20, 59, 60, 80][30, 15, 16]'
file_data = file_data.replace(']',']\n')
arr = file_data.strip('\n')
print (arr)

输出为：

[1, 2, 3, 4, 5]
[20, 59, 60, 80]
[30, 15, 16]

您可以将上面的大多数代码替换为上面的代码。

#turns the text file into a list with each coordinates on a seperate line.
with open('AV.txt', 'r') as file:
    file_data = file.read()
file_data = file_data.replace('],', ']\n')
with open('AV.txt', 'w') as file:
    file.write(file_data)

#puts the vertices into an array
array = []
with open('AV.txt') as f:
    for line in f:
        array.append(line.strip("\n"))

ValueError：无法将字符串转换为浮点型：'-'

1 个答案: