使用python從多個元數據文件中提取特定文本

Question

如何從下面的文本中提取WESTBOUNDINGCOORDINATE，NORTHBOUNDINGCOORDINATE，EASTBOUNDINGCOORDINATE和SOUTHBOUNDINGCOORDINATE？ 但是，所有圖元文件的同一行中都沒有文本，例如，其中一個很好
WESTBOUNDINGCOORDINATE在第2行，但文件2在第4行。請幫助...

    GROUP                  = BOUNDINGRECTANGLE              

    OBJECT                 = WESTBOUNDINGCOORDINATE             
      NUM_VAL              = 1              
      VALUE                = 80.8290376770946               
    END_OBJECT             = WESTBOUNDINGCOORDINATE             

    OBJECT                 = NORTHBOUNDINGCOORDINATE                
      NUM_VAL              = 1              
      VALUE                = 39.9999999964079               
    END_OBJECT             = NORTHBOUNDINGCOORDINATE                

    OBJECT                 = EASTBOUNDINGCOORDINATE             
      NUM_VAL              = 1              
      VALUE                = 104.443461525786               
    END_OBJECT             = EASTBOUNDINGCOORDINATE             

    OBJECT                 = SOUTHBOUNDINGCOORDINATE                
      NUM_VAL              = 1              
      VALUE                = 29.9999999973059               
    END_OBJECT             = SOUTHBOUNDINGCOORDINATE                

  END_GROUP              = BOUNDINGRECTANGLE

我的代碼：

metafiles = glob.glob("D://*.txt")
for f in metafiles:
   with open (f, 'r') as infile:
      lines = infile.readlines()
      WESTBOUNDINGCOORDINATE = lines[4][29:45]
      print (WESTBOUNDINGCOORDINATE)

問題在於WESTBOUNDINGCOORDINATE值並不總是在同一行中。

Answer 1

嘗試遍歷文件，忽略所有空行，並查找以字符串"OBJECT"開頭並以所需坐標結尾的行。

例如：

def parse(filepath):
    with open(filepath) as f:
        contents = f.readlines()

    output = {}
    group = {}
    inside_group = False

    for line in contents:
        line = line.strip()
        if line == '':
            continue

        type, value = line.split('=')
        type = type.strip()
        value = value.strip()

        if type == 'OBJECT':
            inside_group = True
        elif type == 'END_OBJECT':
            output[value] = group
            inside_group = False
            group = {}
        elif inside_group:
            group[type] = value

    return output

這應該以以下形式返回字典：

>>> parse('file1.txt')
{
    "WESTBOUNDINGCOORDINATE": {
        "NUM_VAL": 1,
        "VALUE": 80.829037677094
    },
    "NORTHBOUNDINGCOORDINATE": {
        "NUM_VAL": 1,
        "VALUE": 39.9999999964079
    },
    # etc
}

然后，您可以從詞典中獲取所需的任何坐標。