如何在python中获取文件每行的第一个数字？

mnemlml8 于 2022-12-01 发布在 Python

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inputFile = open(filename, "r")

with open(filename) as f:
    content = f.readlines()
li = [x.strip() for x in content]
print(li)

输出量：

['4', '0 1 2 3', '1 0 2 3', '2 0 1 3', '3 0 1 2']

预期输出：

The number of total vertices is 4
Vertex 0: (0, 1) (0, 2) (0, 3)
Vertex 1: (1, 0) (1, 2) (1, 3)
Vertex 2: (2, 0) (2, 1) (2, 3)
Vertex 3: (3, 0) (3, 1) (3, 2)

我知道如何将元素转换为整数，但每行都不相同，txt文件的格式如下：

是否需要用.split（）方法分隔？

python-3.x

来源：https://stackoverflow.com/questions/74618516/how-to-get-the-first-number-in-each-line-of-a-file-in-python

1条答案

按热度按时间

yxyvkwin1#

试试看：

with open("your_file.txt", "r") as f:
    total_vertices = int(next(f))

    vertices = []
    for _ in range(total_vertices):
        row = list(map(int, next(f).split()))
        vertices.append([(row[0], v) for v in row[1:]])

print("The number of total vertices is", total_vertices)
for i, v in enumerate(vertices):
    print(f"Vertex {i}:", *v)

印刷品：

The number of total vertices is 4
Vertex 0: (0, 1) (0, 2) (0, 3)
Vertex 1: (1, 0) (1, 2) (1, 3)
Vertex 2: (2, 0) (2, 1) (2, 3)
Vertex 3: (3, 0) (3, 1) (3, 2)

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如何在python中获取文件每行的第一个数字？

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