如何在 Python 3 中写入 .txt 文件
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How to write to .txt files in Python 3
提问by Toby Smith
I have a .txtfile in the same folder as this .pyfile and it has this in it:
我.txt在与此.py文件相同的文件夹中有一个文件，其中包含以下内容：
cat\n
dog\n
rat\n
cow\n
How can I save a var (var = 'ant') to the next line of the .txtfile?
如何将 var (var = 'ant') 保存到.txt文件的下一行？
采纳答案by Martijn Pieters
Open the file in append mode and write a new line (including a \nline separator):
以追加模式打开文件并写入一个新行（包括\n行分隔符）：
with open(filename, 'a') as out:
out.write(var + '\n')
This adds the line at the end of the file after all the other contents.
这会在文件末尾添加所有其他内容之后的行。
回答by Sebastian
Just to be complete on this question:
只是为了完成这个问题：
You can also use the print function.
您还可以使用打印功能。
with open(filename, 'a') as f:
print(var, file=f)
The print function will automatically end each print with a newline (unless given an alternative ending in the call, for example print(var, file=f, end='')for no newlines).
打印功能将自动以换行符结束每次打印（除非在调用中给出替代结尾，例如print(var, file=f, end='')没有换行符）。
