Syntax of Python open file function Here,
filename: gives name of the file that the file object has opened. mode: attribute of a file object tells you which mode a file was opened in.
More details of these modes are explained below Step 1) Open the .txt file
We declared the variable “f” to open a file named guru99.txt. Open takes 2 arguments, the file that we want to open and a string that represents the kinds of permission or operation we want to do on the file Here, we used “w” letter in our argument, which indicates Python write to file and it will create file in Python if it does not exist in library Plus sign indicates both read and write for Python create file operation.
Step 2) Enter data into the file
We have a for loop that runs over a range of 10 numbers. Using the write function to enter data into the file. The output we want to iterate in the file is “this is line number”, which we declare with Python write file function and then percent d (displays integer) So basically we are putting in the line number that we are writing, then putting it in a carriage return and a new line character
Step 3) Close the file instance
This will close the instance of the file guru99.txt stored
Here is the result after code execution for create text file in Python example:
How to Create a Text File in Python When you click on your text file in our case “guru99.txt” it will look something like this
Example of how to create a text file in Python Step 1) Once again if you could see a plus sign in the code, it indicates that it will create a new file if it does not exist. But in our case we already have the file, so we are not required to create a new file for Python append to file operation. Step 2) This will write data into the file in append mode.
How to Append Text File in Python You can see the output in “guru99.txt” file. The output of the code is that earlier file is appended with new data by Python append to file operation.
Example of How to Append Text File in Python Step 1) Open the file in Read mode Step 2) We use the mode function in the code to check that the file is in open mode. If yes, we proceed ahead Step 3) Use f.read to read file data and store it in variable content for reading files in Python Step 4) Print contents for Python read text file Here is the output of the read file Python example:
How to Read Files in Python
How to Read a File line by line in Python When you run the code (f1=f.readlines()) to read file line by line in Python, it will separate each line and present the file in a readable format. In our case the line is short and readable, the output will look similar to the read mode. But if there is a complex data file which is not readable, this piece of code could be useful. Here is the complete code for Python print() to File Example Python 2 Example Python 3 Example Below is another Python print() to File Example:
Summary
Python allows you to read, write and delete files Use the function open(“filename”,”w+”) for Python create text file. The + tells the python interpreter for Python open text file with read and write permissions. To append data to an existing file or Python print to file operation, use the command open(“Filename”, “a“) Use the Python read from file function to read the ENTIRE contents of a file Use the readlines function to read the content of the file one by one.
