在python中将字符串附加到.txt文件的每一行?
我想在文件中的每一行都添加一些文本 这是我的密码在python中将字符串附加到.txt文件的每一行?,python,python-3.6,readline,Python,Python 3.6,Readline,我想在文件中的每一行都添加一些文本 这是我的密码 filepath = 'hole.txt' with open(filepath) as fp: line = fp.readline() cnt = 1 while line: #.......... #want to append text "#" in every line by reading line by line text from .txt file
filepath = 'hole.txt'
with open(filepath) as fp:
line = fp.readline()
cnt = 1
while line:
#..........
#want to append text "#" in every line by reading line by line
text from .txt file
line = fp.readline()
cnt += 1
您可以阅读这些行并将它们放入列表中。然后,以写入模式打开同一文件,并用要追加的字符串写入每一行
filepath = "hole.txt"
with open(filepath) as fp:
lines = fp.read().splitlines()
with open(filepath, "w") as fp:
for line in lines:
print(line + "#", file=fp)
假设可以在内存中加载全文,则可以打开文件,按行拆分,并为每行添加“#”。然后保存:-):
我假设该文件足够小,可以在内存中保存两个副本:
filepath = 'hole.txt'
with open(filepath, 'r') as f:
original_lines = f.readlines()
new_lines = [line.strip() + "#\n" for line in original_lines]
with open(filepath, 'w') as f:
f.writelines(new_lines)
首先,我们打开文件并将所有行读取到列表中。然后,通过strip()
从每一行中删除行终止符,然后添加一些额外的文本和一个新的行终止符,生成一个新列表
然后,最后一行用新的、修改过的行覆盖文件。这有帮助吗
inputFile = "path-to-input-file/a.txt"
outputFile = "path-to-output-file/b.txt"
stringToAPpend = "#"
with open(inputFile, 'r') as inFile, open(outputFile, 'w') as outFile:
for line in inFile:
outFile.write(stringToAPpend+line)
有帮助吗?你的数据有多大?每个文件都有将近500行。请解释一下,这样我才能改进我的答案。(这里也是一样)。很高兴在
print()
方法中了解到file=fp
。工作。我让它以我的方式工作。。。真的很好。谢谢你的工作。:)但是我想要的是,我想要在一个以前创建的文件中做这样的事情。意思是说你想在旧创建的文件中追加。所以你想替换原始文件,而不是创建新文件,对吗?是的,我知道了。尝试了您提供的代码片段,并根据我的工作对其进行了修改。非常感谢您的帮助。:)
inputFile = "path-to-input-file/a.txt"
outputFile = "path-to-output-file/b.txt"
stringToAPpend = "#"
with open(inputFile, 'r') as inFile, open(outputFile, 'w') as outFile:
for line in inFile:
outFile.write(stringToAPpend+line)