如何在python中引用变量？

Question

I don't know how to explanation my issue,here is code and error:

html_title = 'abc'
file_name = html_title, '.txt'
html_write_to_file = open(file_name, 'wt')
...
...
...

error:

TypeError: coercing to Unicode: need string or buffer, tuple found

I notice that file_name must add quotation marks like this

html_write_to_file = open('file_name', 'wt')

when I add quotation marks,the Variable functions does not work in open('file_name', 'wt')

but I have to use filename format like this: html_title, '.txt'

I don't know how to do...

Supplementary question:

characters are Japanese or Chinese,I tried encode to utf-8,still not work well.

Answer 1

You create a tuple here:

file_name = html_title, '.txt'

The comma makes it a tuple; here you created a tuple with two elements. You then pass that tuple to the open() command:

html_write_to_file = open(file_name, 'wt')

which complains that it can only take a string; it tells you that a tuple is not acceptable.

You probably just wanted to add .txt to the html_title string, so use + to concatenate the strings:

file_name = html_title + '.txt'

Now file_name is a string object too.