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Python write() Function



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The write() function in Python used to write content (text) in a file. The function is used either to write or to append the data to the file depending on its opening mode.

Note - The w mode is for writing, whereas the a mode is for appending.

Python write() Syntax

The syntax to use write() function in a Python program is:

fo.write(string_to_write)

where fo indicates to the file object or handler, and string_to_write is the string or text that has to be written in the file whose handler is fo.

Python write() Example

The program given below uses write() function to write some texts say Hey! My name is Michael Smith to a file say codescracker.txt. Before writing to the file, we need to open the file, so here I've used w opening mode.

Because I've used w opening mode, therefore if the file codescracker.txt is not available in the current directory, then the file automatically gets created and the content gets written in it. Otherwise, if file is available, then the content gets overwritten or previous content gets deleted and this new content gets written. Let's see how.

fo = open("codescracker.txt", "w")
fo.write("Hey! My name is Michael Smith")
print("The content written in the file.")
fo.close()

If you execute this program, then the output produced will be:

python write function

Now if you open the current directory, then this file with same content will be available. Here is the snapshot of the file that is created using the above program in my case:

write function python

Now let's create another program, that demonstrates all about write() function in single Python program. This program is created, so that, the name of file gets received by user, at run-time of the program.

print("Enter File's Name: ", end="")
filename = input()
print("\n1. Write Content.")
print("2. Append Content.")
print("Enter Your Choice (1 or 2): ", end="")
choice = int(input())
if choice == 1:
    fo = open(filename, "w+")
    print("\nEnter the content to write: ", end="")
    content = input()
    fo.write(content)
    print("\n----Content of File----")
    fo.seek(0)
    print(fo.read())
    fo.close()
elif choice == 2:
    fo = open(filename, "a+")
    print("\nEnter the content to append: ", end="")
    content = input()
    fo.write("\n")
    fo.write(content)
    print("\n----Content of File----")
    fo.seek(0)
    print(fo.read())
    fo.close()
else:
    print("\nInvalid Input!")

Here is its sample run with user input codescracker.txt as name of file, 2 as choice, and This is a tutorial on write() Function. as content:

python write function example

Note - The end= parameter, in above program, used to skip automatic insertion of a newline using the default behavior of print() function.

The following statement:

fo.seek(0)

is used to move the file handler at the beginning of the file to read all the content from start to end. To learn in detail about seek(), refer to its separate tutorial.

And the statement:

fo.write("\n")

is used to append the content from newline.

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