1

I have a list l1=['hi','hello',23,1.23].

I want to write the text ['hi','hello',23,1.23] inside a text file, ie, the value of list as it is.

Simple 

with open('f1.txt','w') as f:
     f.write(l1)

doesn't work, so I tried this 

f=open('f1.txt','w')
l1=map(lambda x:x+',', l1)
f.writelines(l1)
f.close()

But this doesn't work either. It says

TypeError: unsupported operand type(s) for +: 'int' and 'str'

.

How to accomplish this when list contains numbers, alphabets and float?

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4
  • You have list l1=['hi','hello',23,1.23] and you want to write the text ['hi','hello','welcome'], but how are these two related? Commented Dec 27, 2017 at 10:24
  • 1
    However if you would have done f.write(str(l1)), it should have worked in the first code-snippet you shared Commented Dec 27, 2017 at 10:25
  • Not a dupe because the answers mentioned here does not work when the list contains string, numbers float simultaneously. Commented Dec 27, 2017 at 10:33
  • some of the answers are for numeric elements too. For example this, this and this Commented Dec 27, 2017 at 11:04

3 Answers 3

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2

You've just:

with open('f1.txt', 'w') as f:
    f.write(str(l1))
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2 Comments

@pstatix why downvote though? Its not like this wont work or anything.
@RoadRunner I upvoted to remove. I misread the listing of elements.
0

you can't write the list directly into the file, But first you have to convert your list into the string and then save the string in to the file. I have answered the same question back. you can check it here.

How write a list of list to file

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Comments

-1

Use the list's __str__() method.

with open('file.txt', 'w') as f:
    f.write(l1.__str__())

The __str__() method for any object returns the string that print takes; in your case, your formatted list.

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3 Comments

why not just str(l1)? .__str__(..) is a magic function and it is not a good practice to show magic everywhere (specially when it is not required) :)
@MoinuddinQuadri oh, I was under the impression from >"I want to write the text ['hi','hello','welcome'] inside a text file" that OP wanted the string's representation
Yes, the string representation is wanted. But you get that with str(l1).

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