Python 2.5-根据查找列表中存储的值更新文本文件文件夹

我正在尝试编写一个脚本，该脚本将根据查找表更新文本文件文件夹。查找表包括文件名、旧路径、新路径。脚本在每个文本文件中查找文件名，如果有，它将用新路径更新同一行中的旧路径。代码是：

# Import
from array import *
import glob

# Specify the lookup table, to keep it simple drop it in with the workspaces
Lookup = "./Lookup.csv"

# Specify the 
Workspaces = glob.glob('./*.wor')

# Open the Lookup table
for line in open(Lookup).readlines():
    # Create the list to store the lookup parameters of the lookup line
    LookupList = []
    # Split the lookup csv at the comma
    for i in line.split(","):
      #print i
        LookupList.append(i)
# Use the list parameters to populate variables (could use list parameters but
# easier for now to assign to variable)
FileName = LookupList[0]
OldPath = LookupList[1]
NewPath = LookupList[2]

# We now have variables to use in the replace statement
# Use the Workspaces Glob to loop through the workspaces
for wor in Workspaces:
    # Try to open the the first workspace (text file)
    f = open(wor, 'r+')
    # Loop through the open file 
    for line in f.readlines():
        # For each line check whether the current list value (FileName) is in the line
        if '"' + OldPath + '"' in line:
            print line
            # Update the line, replacing the old path with the new path.
            line.replace(OldPath, NewPath);
    # Close the workspace file        
    f.close()

这一切似乎都正常工作，print语句末尾的5行找到了包含查找中的搜索字符串的正确行，但文件未更新

我已经阅读了尽可能多的关于文件打开模式和更新文件的内容，但没有明显的解决方案。我想问题是读/写同一个文件。我选择的路径是打开查找并嵌入要更改的文件循环。另一种方法是打开文件，然后循环查找

很高兴将更新后的文件写入另一个名称/文件夹，但问题是，如果在要更新的文件中循环，则根据查找更新该行，当到达查找的下一行时，它将覆盖以前的查找更改

任何想法都受到了感激。如果描述似乎很复杂，很乐意澄清目标不明显的任何领域

谢谢

保罗

返回字符串列表，并且您正在迭代这些字符串。因此，当您使用

line.replace(...)

您没有更改文本文件。相反，您正在更改已读入的字符串

您的方法应该是将每一行写入临时列表，然后将该临时列表写入文件，如：

f = open(wor, 'r+')
new_lines = []
for line in f.readlines():

    if '"' + OldPath + '"' in line :
        line.replace(OldPath, NewPath);
    new_lines.append(line)

f.close()

file("path/to/your/new/or/temp/file","w")
file.write("\n".join(new_lines))
file.close()

---

添加LookupList的方式存在问题，因为您反复将它分配给[]，这会使它再次为空，因此只保留最后一次迭代。但除此之外，本编写代码应实现您的预期目标：

# We now have variables to use in the replace statement
# Use the Workspaces Glob to loop through the workspaces
for wor in Workspaces:
    # Handles opening and closing of input and output files
    with open(wor, 'r'),open("new_" + wor,'w') as infile,outfile:
        # Loop through the input file
        for line in infile.readlines():
            # For each line check whether the current list value (FileName) is in the line
            if '"' + OldPath + '"' in line:
                print line
                # Update the line, replacing the old path with the new path.
                line.replace(OldPath, NewPath);
            outfile.write(line)

---

这是我用于测试的代码。它包含了科尔建议的很大一部分，所以我相信他的答案。我对Python非常陌生，因此代码可能非常漂亮，但它产生了我们所期望的结果

# Import
from array import *
import glob

# Specify the lookup table, to keep it simple drop it in with the workspaces
Lookup = "./Lookup.csv"

# Specify the list of workspaces (text files to update)
Workspaces = glob.glob('./*.wor')

# Open the Lookup table
for line in open(Lookup).readlines():
    # Create the list to store the lookup parameters of the lookup line
    LookupList = []
    # Split the lookup csv at the comma
    for i in line.split(","):
      # Add items to the lookup list
        LookupList.append(i)

    # Assign the list value to a variable (could skip assigning to variable),
    # strip CR from value or it will add it to the output string
    FileName = LookupList[0].strip()
    NewPath = LookupList[1].strip()

    # Loop through the workspaces
    for wor in Workspaces:

        # Open the workspace
        f = open(wor, 'r+')

        # Create list 
        WorList = []

        # Read through the workspace and use it to populate the list
        for line in f.readlines():
            WorList.append(line)
        f.close()

        # Loop through the workspace list looking for the FileName string (from the lookup list)
        for position, item in enumerate(WorList):
            if " " +  FileName + " " in item:
                # If the filename is found then create a string with the new file name in the old row structure
                Newval = "Open Table " + '"'+ NewPath + '" ' + "As " + FileName + " Interactive\n"
                # Update the value in the list based on the list position
                WorList[position] = Newval;

        # Open the output file (this is the same as the original input file)
        file=open(wor,"w")

        # Work through the list and write it to the file
        for s in WorList:
            file.write(s)
        file.close()

---

代码有一些问题，我注意到的第一个主要问题是，您只使用Lookup.csv文件的最后一行。我是盲人吗？您在哪里写入更新或写入任何文件？该文件不会更新，因为您没有向其写入任何新内容。您当前正在尝试仅在内存中修改

line

，但还需要将结果分配给某个对象，

result=line.replace（OldPath，NewPath）

Rob-抱歉，当代码粘贴到#Use的缩进中时，列表参数丢失，这和下面的所有行都应该在上面的for循环中。罗伯特/马丁，你们都是对的。我在下面添加了我最终使用的代码。Rob，谢谢你的代码。在2.5版本中，我得到错误“Warning:'with'将成为Python 2.6中的保留关键字”，因此我无法使用上面的语句

# Import
from array import *
import glob

# Specify the lookup table, to keep it simple drop it in with the workspaces
Lookup = "./Lookup.csv"

# Specify the list of workspaces (text files to update)
Workspaces = glob.glob('./*.wor')

# Open the Lookup table
for line in open(Lookup).readlines():
    # Create the list to store the lookup parameters of the lookup line
    LookupList = []
    # Split the lookup csv at the comma
    for i in line.split(","):
      # Add items to the lookup list
        LookupList.append(i)

    # Assign the list value to a variable (could skip assigning to variable),
    # strip CR from value or it will add it to the output string
    FileName = LookupList[0].strip()
    NewPath = LookupList[1].strip()

    # Loop through the workspaces
    for wor in Workspaces:

        # Open the workspace
        f = open(wor, 'r+')

        # Create list 
        WorList = []

        # Read through the workspace and use it to populate the list
        for line in f.readlines():
            WorList.append(line)
        f.close()

        # Loop through the workspace list looking for the FileName string (from the lookup list)
        for position, item in enumerate(WorList):
            if " " +  FileName + " " in item:
                # If the filename is found then create a string with the new file name in the old row structure
                Newval = "Open Table " + '"'+ NewPath + '" ' + "As " + FileName + " Interactive\n"
                # Update the value in the list based on the list position
                WorList[position] = Newval;

        # Open the output file (this is the same as the original input file)
        file=open(wor,"w")

        # Work through the list and write it to the file
        for s in WorList:
            file.write(s)
        file.close()