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我正在尝试以特定格式读取文本文件并从中提取坐标并将它们存储在有序的字典中。文本文件中的一组包含一个标题行，后跟 x 和 y 坐标。x, y 坐标始终.以\t(tab) 开头。一个文本文件包含多个这样的集合。我的想法是将每个集合的 x 和 y 提取到一个列表中，并将其附加到一个有序的字典中。基本上，最后，它将是一个列表的列表，列表的数量等于将附加到有序字典的集合的数量。

文本文件外观的图示：

Freehand    green   2   2   0,0 289618  .   
.   104326.2,38323.8    104309.6,38307.2    104286.3,38287.3    104269.6,38270.6    104256.3,38254.0
.   104239.7,38237.4    104223.0,38220.7    104209.7,38204.1    104193.1,38194.1    104176.4,38187.5

Freehand    green   2   3   0,0 63980   .   
.   99803.4,37296.2 99826.7,37306.2 99843.3,37312.8 99860.0,37316.2 99876.6,37322.8

我的代码：

from collections import OrderedDict
import re

dict_roi = OrderedDict([
                ("title", []),
                ("X", []),
                ("Y", []) ])

with open(elements_file,"r") as f:

    try:
        # pattern to match to get coordinates
        pattern = re.compile(".\t\d+.*")

        # loop through lines and find title line and line with coordinates

        for i, line in enumerate(f):
            # get title line
            if line.startswith('Freehand'):
                dict_roi['title'].append(line) 

                # initiate empty list per set
                XX = []  
                YY = []

            # line with coordinates starts with .\t
            # if pattern matches and line starts with .\t, get the coordinates
            for match in re.finditer(pattern, line):
                if line.startswith('.\t'):
                    nln = "{}".format(line[2:].strip())
                    val = nln.split('{:6.1f}')

                    # data-massaging to get to the coordinates
                    for v in val:
                        coordinates_list = v.split("\t") 
                        for c in coordinates_list:
                            x, y = c.split(',')
                            print(x, y)
                            XX.append(float(x))
                            YY.append(float(y))

                        # this should append one list per set
                        dict_roi['X'].append(XX)
                        dict_roi['Y'].append(YY)


    except ValueError:
        print("Exiting")

    print(dict_roi)

理想情况下，我想要一个有序的字典，它会给我类似的东西：

('X', [[104326.2, 104309.6, 104286.3, 104269.6, 104256.3, 104239.7, 104223.0, 104209.7, 104193.1, 104176.4], 
[99803.4, 99826.7, 99843.3, 99860.0, 99876.6]])

('Y', [[38323.8, 38307.2, 38287.3, 38270.6, 38254.0, 38237.4, 38220.7, 38204.1, 38194.1, 38187.5], 
[37296.2, 37306.2, 37312.8, 37316.2, 37322.8]])])

但我的输出如下所示：

('X', [[104326.2, 104309.6, 104286.3, 104269.6, 104256.3, 104239.7, 104223.0, 104209.7, 104193.1, 104176.4], 
[104326.2, 104309.6, 104286.3, 104269.6, 104256.3, 104239.7, 104223.0, 104209.7, 104193.1, 104176.4], 
[99803.4, 99826.7, 99843.3, 99860.0, 99876.6]])

('Y', [[38323.8, 38307.2, 38287.3, 38270.6, 38254.0, 38237.4, 38220.7, 38204.1, 38194.1, 38187.5], 
[38323.8, 38307.2, 38287.3, 38270.6, 38254.0, 38237.4, 38220.7, 38204.1, 38194.1, 38187.5], 
[37296.2, 37306.2, 37312.8, 37316.2, 37322.8]])])

我从每个集合中获取列表的多个副本。例如，这里的XandY列表是从第一组复制而来的。可能与添加后清除列表有关，或者放置空列表XX和YY. 但是我已经多次尝试了多种变体，并且似乎得到了上面的输出或每行的列表，而不是有序字典中的每组列表。

有谁知道如何以我在理想情况下得到输出的方式格式化此代码？

4

1 回答 1

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我通过不使用正则表达式稍微简化了它。

相反，对于每一行，坐标都存储在一个名为 的列表中coords。
每个 x 将有一个偶数索引，而 y 将是奇数。因此，切片这个列表会给你你的XXand YY。

from collections import OrderedDict

input_text = '''Freehand    green   2   2   0,0 289618  .   
.   104326.2,38323.8    104309.6,38307.2    104286.3,38287.3    104269.6,38270.6    104256.3,38254.0
.   104239.7,38237.4    104223.0,38220.7    104209.7,38204.1    104193.1,38194.1    104176.4,38187.5

Freehand    green   2   3   0,0 63980   .   
.   99803.4,37296.2 99826.7,37306.2 99843.3,37312.8 99860.0,37316.2 99876.6,37322.8'''


dict_roi = OrderedDict([('title', []),
                        ('X', []),
                        ('Y', [])])

lines = input_text.split('\n')

Xs = []
Ys = []

for i, line in enumerate(lines):

    # When a line contains a tile
    if line.startswith('Freehand'):
        dict_roi['title'].append(line)

        if Xs and Ys:
            dict_roi['X'].append(Xs)
            dict_roi['Y'].append(Ys)
            Xs = []
            Ys = []

    # When a line is empty
    elif not line:
        continue

    # When a line contains coordinates
    else:
        line = line.replace('\n', '')
        line = line.replace('\t', ',')
        line = line.replace(' ', ',')
        coords = line.split(',')
        coords = [e for e in coords if e != '.' and e]
        coords = [float(c) for c in coords]

        # Xs are even, Ys are odd
        Xs += coords[0:: 2]
        Ys += coords[1:: 2]

dict_roi['X'].append(Xs)
dict_roi['Y'].append(Ys)

print(dict_roi)

输出：

[('title', ['Freehand    green   2   2   0,0 289618  .   ', 'Freehand    green   2   3   0,0 63980   .   ']),

 ('X', [[104326.2, 104309.6, 104286.3, 104269.6, 104256.3, 104239.7, 104223.0, 104209.7, 104193.1, 104176.4], [99803.4, 99826.7, 99843.3, 99860.0, 99876.6]]), 

('Y', [[38323.8, 38307.2, 38287.3, 38270.6, 38254.0, 38237.4, 38220.7, 38204.1, 38194.1, 38187.5], [37296.2, 37306.2, 37312.8, 37316.2, 37322.8]])])
于 2019-11-21T13:56:43.837 回答