Print string to text file


I’m using Python to open a text document:

text_file = open("Output.txt", "w")

text_file.write("Purchase Amount: " 'TotalAmount')


I want to substitute the value of a string variable TotalAmount into the text document. Can someone please let me know how to do this?

Asked By: The Woo



It is strongly advised to use a context manager. As an advantage, it is made sure the file is always closed, no matter what:

with open("Output.txt", "w") as text_file:
    text_file.write("Purchase Amount: %s" % TotalAmount)

This is the explicit version (but always remember, the context manager version from above should be preferred):

text_file = open("Output.txt", "w")
text_file.write("Purchase Amount: %s" % TotalAmount)

If you’re using Python2.6 or higher, it’s preferred to use str.format()

with open("Output.txt", "w") as text_file:
    text_file.write("Purchase Amount: {0}".format(TotalAmount))

For python2.7 and higher you can use {} instead of {0}

In Python3, there is an optional file parameter to the print function

with open("Output.txt", "w") as text_file:
    print("Purchase Amount: {}".format(TotalAmount), file=text_file)

Python3.6 introduced f-strings for another alternative

with open("Output.txt", "w") as text_file:
    print(f"Purchase Amount: {TotalAmount}", file=text_file)
Answered By: John La Rooy

In case you want to pass multiple arguments you can use a tuple

price = 33.3
with open("Output.txt", "w") as text_file:
    text_file.write("Purchase Amount: %s price %f" % (TotalAmount, price))

More: Print multiple arguments in python

Answered By: user1767754

If you are using Python3.

then you can use Print Function :

your_data = {"Purchase Amount": 'TotalAmount'}
print(your_data,  file=open('D:log.txt', 'w'))

For python2

this is the example of Python Print String To Text File

def my_func():
    this function return some value
    return 25.256

def write_file(data):
    this function write data to file
    :param data:
    file_name = r'D:log.txt'
    with open(file_name, 'w') as x_file:
        x_file.write('{} TotalAmount'.format(data))

def run():
    data = my_func()

Answered By: Rajiv Sharma

If you are using numpy, printing a single (or multiply) strings to a file can be done with just one line:

numpy.savetxt('Output.txt', ["Purchase Amount: %s" % TotalAmount], fmt='%s')
Answered By: Guy s

With using pathlib module, indentation isn’t needed.

import pathlib
pathlib.Path("output.txt").write_text("Purchase Amount: {}" .format(TotalAmount))

As of python 3.6, f-strings is available.

pathlib.Path("output.txt").write_text(f"Purchase Amount: {TotalAmount}")
Answered By: naoki fujita

use of f-string is a good option because we can put multiple parameters with syntax like str,

for example:

import datetime

now =
price = 1200
currency = "INR"

with open("D:\log.txt","a") as f:
    f.write(f'Product sold at {currency} {price } on {str(now)}n')
Answered By: Akhilesh_IN

If you need to split a long HTML string in smaller strings and add them to a .txt file separated by a new line n use the python3 script below.
In my case I am sending a very long HTML string from server to client and I need to send small strings one after another.
Also be careful with UnicodeError if you have special characters like for example the horizontal bar or emojis, you will need to replace them with others chars beforehand.
Also make sure you replace the "" inside your html with ''

#decide the character number for every division    
divideEvery = 100

myHtmlString = "<!DOCTYPE html><html lang='en'><title>W3.CSS Template</title><meta charset='UTF-8'><meta name='viewport' content='width=device-width, initial-scale=1'><link rel='stylesheet' href=''><link rel='stylesheet' href=''><link rel='stylesheet' href=''><style>body {font-family: 'Lato', sans-serif}.mySlides {display: none}</style><body></body></html>"

myLength = len(myHtmlString)
division = myLength/divideEvery
print("number of divisions")

carry = myLength%divideEvery
print("characters in the last piece of string")

f = open("result.txt","w+")
f.write("Below the string splitted rn")

for i in range(0,len(x),n):

for item in myArray:
    f = open('result.txt', 'a')
    f.write('server.sendContent("'+item+'");' 'n'+ 'n')

Answered By: Pietro

I guess lots of people use the answers here as a general quick reference to how to write a string to a file. Quite often when I write a string to a file, I’d want to specify the file encoding and here is how to do it:

with open('Output.txt', 'w', encoding='utf-8') as f:
    f.write(f'Purchase Amount: {TotalAmount}')

If you don’t specify the encoding, the encoding used is platform-dependent
(see the docs). I think the default behavior is rarely useful from a practical point of view and could lead to nasty problems. That’s why I almost always set the encoding parameter.

Answered By: at54321
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