Question

我必须在python中创建一个程序，我使用文本文件中数字的纬度和经度来计算距离。我知道如何进行计算，但我迷失了如何匹配文本文件中的纬度和长度。我的文本文件如下所示：

38.898      -77.037
38.897      -77.043

我需要匹配第一个数字w / lat1和底部数字w / lat2。谢谢。

Answer 1

只需创建[longitude, latitude]值列表。

import re

coordinates = []

with open('myfile.txt') as myfile:
     for line in myfile.readlines():
         coordinates.append(re.findall(r'[\d.]+', line))

现在您可以轻松获取任何值，并进行计算，例如

lat1 = coordinates[0][1]
long2 = coordinates[1][0]

Answer 2

假设文件中只有两行：

convert = lambda line: map(float, line.strip().split())

with open('a.txt') as f:
   lat1, long1 = convert( f.readline() )
   lat2, long2 = convert( f.readline() )

print(lat1)
print(long1)
print(lat2)
print(long2)

输出：

38.898
-77.037
38.897
-77.043

您可以使用for循环轻松概括它。

Answer 3

38.898      -77.037

38.897      -77.043

58.897      -77.045

58.897      -77.045

31.191      -77.037

31.192      -77.043

51.191      -77.049

51.190      -77.045

import re

allNums = []

with open("dir", "r") as f:
  for line in f:
    l = re.findall('\d+.\d+',line)
    if len(l) == 2:
        allNums.extend(l)
# split list into size 2 sublists
coord = [allNums[i:i+2] for i in range(0, len(allNums), 2)]

for el in coord:
    print(el)

<强>输出

[＆＃39; 38.898＆＃39;，＆＃39; 77.037＆＃39;]

[＆＃39; 38.897＆＃39;，＆＃39; 77.043＆＃39;]

[＆＃39; 58.897＆＃39;，＆＃39; 77.045＆＃39;]

[＆＃39; 31.191＆＃39;，＆＃39; 77.037＆＃39;]

[＆＃39; 31.192＆＃39;，＆＃39; 77.043＆＃39;]

[＆＃39; 51.191＆＃39;，＆＃39; 77.049＆＃39;]

[＆＃39; 51.190＆＃39;，＆＃39; 77.045＆＃39;]

Python帮助从文本文件中读取

3 个答案:

输出：