In the following code, I want to substitute the value of a string variable TotalAmount into the text document, with Python:
text_file = open("Output.txt", "w")
text_file.write("Purchase Amount: " 'TotalAmount')
text_file.close()
How to do this?
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)
text_file.close()
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)
TotalAmount is an int, either %d or %s will do the same thing.
with . . .: print('{0}'.format(some_var), file=text_file) is throwing: SyntaxError: invalid syntax at the equal sign...from __future__ import print_function at the top of the file. Note that this will transform all of the print statements in the file to the newer function calls.
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))
w+?
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:
"""
return 25.256
def write_file(data):
"""
this function write data to file
:param data:
:return:
"""
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()
write_file(data)
run()
w+?
print(your_data, file=open(...)) will leave the file opened
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}")
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')
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.
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='https://www.w3schools.com/w3css/4/w3.css'><link rel='stylesheet' href='https://fonts.googleapis.com/css?family=Lato'><link rel='stylesheet' href='https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css'><style>body {font-family: 'Lato', sans-serif}.mySlides {display: none}</style><body></body></html>"
myLength = len(myHtmlString)
division = myLength/divideEvery
print("number of divisions")
print(division)
carry = myLength%divideEvery
print("characters in the last piece of string")
print(carry)
f = open("result.txt","w+")
f.write("Below the string splitted \r\n")
f.close()
x=myHtmlString
n=divideEvery
myArray=[]
for i in range(0,len(x),n):
myArray.append(x[i:i+n])
#print(myArray)
for item in myArray:
f = open('result.txt', 'a')
f.write('server.sendContent(\"'+item+'\");' '\n'+ '\n')
f.close()
w+?