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Python Write File

Writing To File In Python

We have previously seen how we can read from a file in Python. Similarly writing to a file can also be achieved in Python programming. But, before we start writing to a file, we must ensure that the mode in which the file has been open allows it. Let us take a look using which modes we can actually write to a file.

  • w – opens the file for writing and creates one file if it doesn’t exist,
  • w+ – opens the file for both writing and reading,
  • a – opens the file for appending. The data gets appended to the end of the file,
  • x – creates a new file in writing as well as reading mode,
  • r+ – opens the file for both reading and writing.

So now, let’s see how we can write to a file in Python using different approaches.

1. Python Write File using write() function

Using the write() function, we can actually directly write a string (which is passed as an argument) to a file.

file = open("new_file.txt", "w+")
file.write('Using the write() method')
file.seek(0)
print(file.read())

Output:

Using the write() method
Write
Output: new_file.txt is created

2. Using writelines() in Python

writelines() is another pre-defined method in Python which is used to write multiple lines into a specific file, with a list of string elements passed as an argument.

list1=[ ‘ string 1 ‘ ,’ string 2 ‘, …… , ‘ string n ‘]

file_open_object.writelines( list1 )

list1=['Python\n','C\n','C++\n','Java']
file=open("new_file.txt", "w+")
file.writelines(list1)
file.seek(0)
print(file.read())

Output:

Python
C
C++
Java

References: