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Python Write Text File
ItsMyCode |
Python provides built-in functions to perform file operations, such as creating, reading, and writing files. There are mainly two types of files that Python can handle, normal text files and binary files. In this tutorial, we will look at how to write content into text files in Python.
In order to write to a text file in Python, you need to follow the below steps.
Step 1: The file needs to be opened for writing using the
open() method and pass a file path to the function.Step 2: The next step is to write to file, and this can be achieved using several built-in methods such as
write(), writelines().Step 3: Once the write operation is performed, the text file must be closed using the
close() function.Now that we have seen the steps to write to a text file let’s understand each of these methods before getting into examples.
The
open() function opens the file if possible and returns the corresponding file object.Syntax – open(file, mode=’w’, buffering=-1, encoding=None, errors=None, newline=None, closefd=True, opener=None)
The
open() function has a lot of parameters. Let’s take a look at the necessary params for writing to a text file. It opens the file in a specified mode and returns a file object.Parameters
mode is an optional parameter. It’s a string that specifies the mode in which you want to open the file.| Mode | Description |
|---|---|
'r' |
Open a file for read mode (default if mode is not specified) |
'w' |
Open a file for writing. Python will create a new file if does not exist or truncates a file content if file exists |
'x' |
Open a file for exclusive creation. |
'a' |
Open a file for appending the text. Creates a new file if file does not exist. |
't' |
Open a file in text mode. (default) |
'b' |
Open a file in binary mode. |
'+' |
Open a file for updating (reading and writing) |
*Example *
file = open('C:\hello.txt','w')There are two ways to write data into a text file.
write() : *The *write() function will write a line to a text file. It inserts a single line in the text file.writelines(): The writelines() *function will write multiple string lines at once to a text file. The *writelines() method accepts an iterable object such as *list, set, tuple, etc. *
The file will remain open until you close the file using the
close() function. It is a must and best practice to perform this operation after writing the data into the file as it frees up the memory space acquired by that file. Otherwise, it may cause an unhandled exception. We can use the *with * statement, which helps to close the file once the write operation is performed. We don’t have to specify any explicit close method everytime.
Let’s look at writing a line into a text file using the
write() *method. We will use the *with statement, which helps to close the file once the write operation is performed. We don’t have to specify any explicit close method.# Program to write to text file using write() function
with open("python.txt", "w") as file:
content = "Hello, Welcome to Python Tutorial !! \n"
file.write(content)
file.close()
# Program to read the entire file (absolute path) using read() function
with open("C:/Projects/Tryouts/python.txt", "r") as file:
content = file.read()
print(content)
file.close()Output
Hello, Welcome to Python Tutorial !!If you want to append the line to the existing text file, you need to open the file in the append mode first and perform the
write() operation, as shown below.# Program to append to text file using write() function
with open("python.txt", "a") as file:
content = "Append the content at the end \n"
file.write(content)
file.close()
# Program to read the entire file (absolute path) using read() function
with open("C:/Projects/Tryouts/python.txt", "r") as file:
content = file.read()
print(content)
file.close()Output
Hello, Welcome to Python Tutorial !!
Append the content at the endLet’s look at writing multiple lines into a text file using the
writelines() *method. The *writelines() method accepts an iterable object such as list, set, tuple, etc. In the below example let’s see how to write a list to a file in PythonSyntax of writelines()
file.writelines(list)
Parameters
list – The list of texts or byte objects that will be inserted. It can be a list, tuple, set of strings, etc.
# Program to write multiple lines to text file using writelines() function
with open("python.txt", "w") as file:
content = ["Hello\n", "Welcome to Python Tutorial\n", "Cheers \n"]
file.writelines(content)
file.close()
# Program to read the entire file (absolute path) using read() function
with open("C:/Projects/Tryouts/python.txt", "r") as file:
content = file.read()
print(content)
file.close()Output
Hello
Welcome to Python Tutorial
CheersIf you want to append multiple lines to the existing text file, you need to open the file in the append mode first and perform the
writelines() operation, as shown below.# Program to append to text file using writelines() function
with open("python.txt", "a") as file:
content = ["Appending the content\n", "Python\n"]
file.writelines(content)
file.close()
# Program to read the entire file (absolute path) using read() function
with open("C:/Projects/Tryouts/python.txt", "r") as file:
content = file.read()
print(content)
file.close()Output
Hello
Welcome to Python Tutorial
Cheers
Appending the content
PythonThe post Python Write Text File appeared first on ItsMyCode.
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