列表和字符串格式的困难:导入txt文件、添加字符串并将其写入新文件

你可以这样解决:

newFile = 'your_new_file.txt'
oldFile = 'your_old_file.txt'

# Open the new text file
with open(newFile, 'w') as new_file:
    # Open the old text file
    with open(oldFile, 'r') as old_file:
        # Write the line before the old content
        new_file.write('Line before old content\n')

        # Write old content
        for line in old_file.readlines():
            new_file.write(line)

        # Write line after old content
        new_file.write('Line after old content')

您的变量 lines list ,它没有方法 write .
此外 insert

您需要读取文件,相应地使用前缀和后缀值连接它,然后将其写入适当的输出文件:

with open("text_file_path", "r") as input_file:
    text = input_file.read()

text = '\n'.join(("String Values Before", text, "String Values After"))

with open("new_file.txt", "w+") as output_file:
    output_file.write(text)

pformat .
pprint

before_values = ["a", "b", "c"]
data = ["1", "2", "3"]
after_values = ["d", "e", "f"]
with open("outfile.txt", "w) as outfile:
    outfile.write("\n".join(before_values)) # Write before values
    outfile.write(pprint.pformat(data))     # Write data list
    outfile.write("\n".join(after_values))  # Write after values

insert 方法,因为您必须提供索引;但是,您可以添加、加入结果列表并写入文件:

text_file = open(r"text_file path", "r")
lines = text_file.read().split(',')
lines.insert(0, "String Values Before")
lines.append("String Values After")
text_file.close()
new_file = open('text_file_path.txt', 'w')
new_file.write(','.join(lines)+'\n')
new_file.close()