How do you write multiple strings in a text file in python?

target.write[line1 \n, line2 \n, line3 \n]

'\n' only make sense inside a string literal. Without the quotes, you don't have string literals.

target.write['line1 \n, line2 \n, line3 \n']

Ok, now everything is a string literal. But you want line1, line2, line3 to not be string literals. You need those as python expressions to refer the variables in question. Basically, you have to put quotes around strings that are actually text like "\n" but not around variables. If you did that, you might have gotten something like:

target.write[line1 '\n' line2 '\n' line3 '\n']

What is 2 2? It's nothing. You have to specify to python how to combine the two pieces. So you can have 2 + 2 or 2 * 2 but 2 2 doesn't make any sense. In this case, we use add to combine two strings

target.write[line + '\n' + line2 + '\n' + line3 + '\n']

Moving on,

target.write[%r \n, %r \n, %r \n] % [line1, line2, line3]

Again \n only makes sense inside a string literal. The % operator when used to produce strings takes a string as its left side. So you need all of that formatting detail inside a string.

target.write['%r \n', '%r \n', '%r \n'] % [line1, line2, line3]

But that produce 3 string literals, you only want one. If you did this, write complained because it excepts one string, not 3. So you might have tried something like:

target.write['%r \n%r \n%r \n'] % [line1, line2, line3]

But you want to write the line1, line2, line3 to the file. In this case, you are trying to the formatting after the write has already finished. When python executes this it will run the target.write first leaving:

None % [line1, line2, line3]

Which will do nothing useful. To fix that we need to to put the % [] inside the .write[]

target.write['%r\n%r\n%r\n' % [line1, line2, line3]]

Python has built-in functions for creating, reading, and writing files, among other file operations. Normal text files and binary files are the two basic file types that Python can handle. We'll look at how to write content into text files in Python in this article.

Steps involved writing multiple lines in a text file using Python

Following are the ways to write multiple lines in text file using Python −

• The open[] method must be used to open the file for writing, and the function must be given a file path.
• The following step is to write to file. Several built-in methods, such as write[] and writelines, can be used to do this [].
• The text file has to be closed using the close[] method after the writing process is finished.

Note − All the examples mentioned below follows the above mentioned steps.

Open[] Function

If opening the file is possible, the open[] function does it and returns the matching file object.

There are numerous parameters for the open[] function. Let's examine the parameters required for writing to a text file. It returns a file object after opening the file in the chosen mode.

Syntax

file = open['filepath','mode']

Where,

• filepath − It represents the path of the file.
• mode − It holds numerous optional parameters. It is a string that indicates the opening mode for the file.

Using writelines[] Function

This function writes several string lines to a text file simultaneously. An iterable object, such as a list, set, tuple, etc., can be sent to the writelines[] method.

Syntax

file.writelines[list]

Where list is the collection of texts or bytes that will be added. It could be a string collection, tuple, list, etc.

Example - 1

Following is an example to write multiple lines in a file using Python −

with open['file.txt', 'a'] as file:
   l1 = "Welcome to TutorialsPoint\n"
   l2 = "Write multiple lines \n"
   l3 = "Done successfully\n"
   l4 = "Thank You!"
file.writelines[[l1, l2, l3, l4]]

Output

As an output we get a text file named as “file” with the following lines written in it −

Welcome to TutorialsPoint
Write multiple lines
Done successfully
Thank You!

Example - 2

Following is an alternate example to write multiple lines in a file using Python −

with open["file.txt", "w"] as file:
   lines = ["Welcome to TutorialsPoint\n", "Write multiple lines \n", "Done successfully\n" ]
   file.writelines[lines]
   file.close[]

Output

As an output, we get a text file named as “file” with the following lines written in it −

Welcome to TutorialsPoint
Write multiple lines
Done successfully

Example - 3: Using while loop

Following is an example to write multiple lines in a file using while loop −

def write[]:


   file=open["file.txt",'w']
   while True:
   

      l=input["Welcome to TutorialsPoint:"]


      file.write[l]
      next_line=input["The next line is printed successfully:"]
      if next_line=='N':
      break
      file.close[]
      write[]

Output

Following is an output of the above code −

Welcome to TutorialsPoint:
The next line is printed successfully:

Using the writelines[] Function

If you want to add more lines to an existing text file, you must first open it in append mode and then use the writelines[] function, as seen below.

Example

Following is an example to append multiple lines in a text file −

with open["file.txt", "a"] as f:
   lines = ["Adding lines\n", "writing into it \n", "written successfully\n" ]
   f.writelines[lines]
   f.close[]

Output

We get multiple lines appended in the already existing file −

Welcome to TutorialsPoint
Write multiple lines
Done successfully
Adding lines
writing into it
written successfully

Updated on 18-Aug-2022 06:58:58

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How do you write multiple strings in Python?

How do you write multiple lines in a text file in Python?

How do you write a string to a text file in Python?