[英]Is there a way to read and write on multiple text files in a folder using Python?
我正在尝试从一个文件夹中检索几个文本文件。 之后,我试图读取目录中的所有文件,然后 append 在每个文件的顶部空行。
但是,一旦我运行程序,它就不会执行我想要的。 这是代码:
import os
folderPath = "./textFiles"
def myFilesAddEmptyLine():
for file in os.listdir(folderPath):
if file.endswith(".txt"):
with open(file, "r+") as myFile:
# print(myFile)
# ^ This returns "<_io.TextIOWrapper name='test.txt' mode='r+' encoding='cp1252'>" in the console.
fileContent = myFile.read()
myFile.seek(0, 0)
myFile.write("\n" + fileContent)
myFilesAddEmptyLine()
另一方面,如果我直接读取文件而不尝试使用os自动执行该过程,它会完美地执行我想要实现的目标。 因此,以下代码将打开文件并在文件顶部附加一个空行。
def myFilesAddEmptyLine():
with open("test.txt", "r+") as myFile:
fileContent = myFile.read()
myFile.seek(0, 0)
myFile.write("\n" + fileContent)
myFilesAddEmptyLine()
任何人都可以概述第一段代码的问题是什么? 提前致谢!
正如用户@asylumax 在评论中指出的那样:
import os
folderPath = "./textFiles"
def myFilesAddEmptyLine():
for file in os.listdir(folderPath):
if file.endswith(".txt"):
with open(file, "r+") as myFile:
fileContent = myFile.read()
myFile.seek(0, 0)
myFile.write("\n" + fileContent)
myFilesAddEmptyLine()
需要改成这样:
import os
folderPath = "./textFiles"
def myFilesAddEmptyLine():
for file in os.listdir(folderPath):
if file.endswith(".txt"):
with open(os.path.join(folderPath, file), "r+") as myFile: #This is the line that needed changing.
fileContent = myFile.read()
myFile.seek(0, 0)
myFile.write("\n" + fileContent)
print(myFile)
myFilesAddEmptyLine()
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