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Question

問題，我昨天在這裏發表問題：Finding and adding to a .kml file using python

我讀了一堆教程，現在有了更好的理解蟒蛇，這是很好的。但我似乎仍然無法讓我的劇本正確。我知道我非常接近。基本上我想添加一堆JPG到一個.kml文件，它基本上是谷歌地球上的.xml文件。我希望我的程序能夠在名爲 的XML文件中找到谷歌地球「地標」：TO-XXX

其中XXX與TO-XXX.jpg匹配。我已經有一個包含一堆.jpgs的文件夾，其文件名與每個地標的名稱相匹配。我需要的程序找到

<name> (for example <name>TO-101</name>) 

，並添加正確的用名行下方的行：

<description> <img src=TO-101.jpg></description>. 

所以，我的代碼寫的，但我似乎無法得到它找到了。這始終是寫：

"\t\t\t<name>TO-XXX</name>\n". 

所以，這裏是代碼：

import os 

infile = 'TO-Hand-Holes2.kml' # the file I am reading 
outfile = 'TO-Hand-Holes-Output.kml' # the file I plan to write to, using print for now 
images = os.listdir("./images") # the images folder, all image names match names 

source = open(infile, 'r') 
target = open(outfile, 'w') 

x = 0 #an incrementer 
i = 0 # an incrementer 

readxml = source.readline 
while x < 20000: #There are about 17,000 lines in the .kml file 
    readxml = source.readline() 
    while i < len(images): 
     word = images[i] 
     if readxml == "\t\t\t<name>%s</name>\n" % word[:6]: #!!!!!!!!! the problem is here 
      print readxml #output the <name> 
      print word[:6] #output the <description> 
      hit = 'true' 
      i = i + 1 
     else: 
      hit = 'false' 
      #print "test%s" % word[:6] 
      i = i + 1 
    if hit == 'false': 
     print ("%s") % readxml 
    x = x + 1 

我似乎無法得到它的識別線。有什麼建議麼？

Answer 1

因爲縮進是python中的語法，所以你需要注意事物的位置真的。這可能會更接近。這不是100％完成，但它會指向你在正確的方向：

with open(infile) as fhi, open(outfile, 'w') as fho: 
    for line in fhi: 
    if line == 'myMatchString': 
     fho.write(line.replace('this', 'that')) 

使用的with聲明，這是在2.7引入了多個文件的語法。在2.7之前，你必須嵌套第二個with以獲得第二個文件。

Answer 2

我做了一些改動，但是我沒有文件去測試它。爲了您的學習目的，我做了一些與Python相關的更改。我認爲你應該測試你想要的信息是否在字符串中，而不是檢查等價性。如果你想檢查等價性，你應該使用line.strip（），因爲它將包含你可能沒有考慮到的標籤，換行符等等（你不想明確說明tbh）。

import os 

infile = 'TO-Hand-Holes2.kml' # the file I am reading 
outfile = 'TO-Hand-Holes-Output.kml' # the file I plan to write to, using print for now 
images = os.listdir("./images") # the images folder, all image names match names 

source = open(infile, 'r') 
target = open(outfile, 'w') 

for line in source.readlines(): #read all of the source lines into a list and iterate over them 
    for image in images: #you can iterate over a list like this 
     word = image[:6] #i moved the list slicing here so you only have to do it once 
     if "<name>" in line and word in line: #!!!!!!!!! the problem is here 
      print line #output the <name> 
      print word #output the <description> 
      hit = True #use the built-in Python boolean type 
     else: 
      hit = False 
      #print "test%s" % word[:6] 
     target.write(line) 
     if hit: 
      target.write("<description> <img src={0}></description>\n".format(image) 

source.close() 
target.close() 

Answer 3

這會更好：

import os 

infile = 'TO-Hand-Holes2.kml' # the file I am reading 
outfile = 'TO-Hand-Holes-Output.kml' # the file I plan to write to, using print for now 
images = os.listdir("./images") # the images folder, all image names match names 


with open(infile, 'r') as source: 
    with open(outfile, 'w') as target: 
     for readxml in source: 
      for word in images: 
       hit = readxml == "\t\t\t<name>%s</name>\n" % word[:6] 
       if hit: #!!!!!!!!! the problem is here 
        print readxml #output the <name> 
        print >> target, word[:6] #output the <description>