I want to replace single quotes with double quotes in a list

Question

So I am making a program that takes a text file, breaks it into words, then writes the list to a new text file.

The issue I am having is I need the strings in the list to be with double quotes not single quotes.

For example

I get this ['dog','cat','fish'] when I want this ["dog","cat","fish"]

Here is my code

with open('input.txt') as f:
    file = f.readlines()
nonewline = []
for x in file:
    nonewline.append(x[:-1])
words = []
for x in nonewline:
    words = words + x.split()
textfile = open('output.txt','w')
textfile.write(str(words))

I am new to python and haven’t found anything about this.
Anyone know how to solve this?

[Edit: I forgot to mention that i was using the output in an arduino project that required the list to have double quotes.]

Asked By: ThatsOkay

||

Source

Answer 1

You cannot change how str works for list.

How about using JSON format which use " for strings.

>>> animals = ['dog','cat','fish']
>>> print(str(animals))
['dog', 'cat', 'fish']

>>> import json
>>> print(json.dumps(animals))
["dog", "cat", "fish"]

import json

...

textfile.write(json.dumps(words))

Answered By: falsetru

Answer 2

In Python, double quote and single quote are the same. There’s no different between them. And there’s no point to replace a single quote with a double quote and vice versa:

2.4.1. String and Bytes literals

…In plain English: Both types of literals can be enclosed in matching single quotes (‘) or double quotes ("). They can also be enclosed in matching groups of three single or double quotes (these are generally referred to as triple-quoted strings). The backslash () character is used to escape characters that otherwise have a special meaning, such as newline, backslash itself, or the quote character…

"The issue I am having is I need the strings in the list to be with double quotes not single quotes." – Then you need to make your program accept single quotes, not trying to replace single quotes with double quotes.

Answered By: Huy Vo

Answer 3

Most likely you’ll want to just replace the single quotes with double quotes in your output by replacing them:

str(words).replace("'", '"')

You could also extend Python’s str type and wrap your strings with the new type changing the __repr__() method to use double quotes instead of single. It’s better to be simpler and more explicit with the code above, though.

class str2(str):
    def __repr__(self):
        # Allow str.__repr__() to do the hard work, then
        # remove the outer two characters, single quotes,
        # and replace them with double quotes.
        return ''.join(('"', super().__repr__()[1:-1], '"'))

>>> "apple"
'apple'
>>> class str2(str):
...     def __repr__(self):
...         return ''.join(('"', super().__repr__()[1:-1], '"'))
...
>>> str2("apple")
"apple"
>>> str2('apple')
"apple"

Answered By: Harvey

I want to replace single quotes with double quotes in a list

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