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How to read a file in Python?

Read a file in Python: Python has been so dynamic since the past few years that it has been beating the other programming languages very thick. This is all because of the compatibility it has been producing to all the programming sources. Python’s syntax has been designed in such a way that the coding can be done in a few steps on comparison to the other languages. Reading a file is pretty easy in Python. In this article we will get to know about how to read a file in Python.

Initially founded in the year 1991, Python has been so effective and fun to use. It has been upgrading its language throughout the past two decades. In general, Python uses the imperative and objective functional programming. One of the main reasons why the companies prefer the Python language is because of its versatile features and fewer programming codes. Python has diversified its application into many operating systems and gaming platforms.

Reading a File in Python

On coming to the file extension functions, Python is so designed that it can handle multiple file handling functions. There are generally two kinds of functions that can be handled in Python. They are a)Text files; b)Binary files.
Let us go through some of the steps that you can follow to read a file in Python.

There are three different ways to read a file in Python
They are,

a)read(): Returns the read bytes in the form of a string. If no ‘n’ is specified it reads the entire file.

Read-file python


b)readline(): Reads a line of the file and returns in form of a string.For specified n, reads at most n bytes. However, does not reads more than one line, even if n exceeds the length of the line.

Readline python


c)readlines(): Reads all the lines and return them as each line a string element in a list.

Readlines python

Steps to Read a Python file

There a few steps you can follow to read a python file. Scroll down below to explore.

Reading a Python File

  1. Open the File in read mode

    To read a python file, firstly, you need to open the python file in the read mode using these commands.
    f=open(“filex.txt”, “r”)

  2. Use Mode function

    Now we should use the mode function to check whether the file is in the open mode or not. If the file is in the open mode then we can proceed ahead.
    if f.mode == ‘r’:

  3. Read file data and store variable content

    Now we need to read the file data and store some variable content in it. To do so use the following command.
    contents=f.read()

  4. Print the contents

    When you print the content you would get some output. In this case the output would be as follows.

    def main()

    #open the file back and read the contents
    f=open(“filex.text”, ‘r’)
    if f.mode==”r”:
    #use the read() function to read the content
    contents= f.read()
    print (contents)

    if _ _ name_ _=”_ _ main_ _”:
    main()

    Output: (For suppose the file contains the instruction command like “Hello this is India”). The output now would be
    Hello this is India

Reading a File Line by Line

If your file is too big then this command can segregate your file into line by line. This is how it can do so.

def main():


#open the file back and read the contents
f=open(“filex.text”, ‘r’)
if f.mode==”r”:
#use the read() function to read the content
contents= f.read()
print (contents)

#or, readlines reads the individual lines
fl= f.readlines()
for x in fl:
print(x)

if _ _name_ _= “_ _main_ _”:
main()


Output:

Hello this is India, Hello this is India, Hello this is India

Looping a file line by line in Python

You can also LOOP through the file line by line in Python
This can be achieved by following the below commands.

f = open(“filex.text”, “r”)
for x in f:
print(x)

You can also sort a list with some instructions in Python. Explore the link below to know more about how you can sort a list in Python.

How to sort a list in Python

Examples of Reading a File in Python

Here are a few examples of reading a file in Python. Refer to the images illustrated below to plot some examples.

Example 1:Reading a file in Python

Example 2:Reading a file in Python

If you are thinking on how to print a program in Python, you can simply follow the steps in the link illustrated below. Click on the link and explore more info.

How to print a program in Python

FAQ’s

There are a number of FAQ’s in regard to the Python programming language on the web. We’ve handpicked for you some top 3 FAQ’s which can currently clear some doubts in your minds. Scroll down below to know more

What is Python programming for beginners?

The Definitive Guide. Python is a powerful high-level, object-oriented programming language created by Guido van Rossum. It has simple easy-to-use syntax, making it the perfect language for someone trying to learn computer programming for the first time.

Where is Python programming language used?

Python is a scripting language like PHP, Perl, Ruby and so much more. It can be used for web programming (django, Zope, Google App Engine, and much more). But it also can be used for desktop applications (Blender 3D, or even for games pygame). Python can also be translated into binary code like java.

What language is Python similar to?

Python is often compared to other interpreted languages such as Java, JavaScript, Perl, TCL, or Small talk. Comparisons to C++, Common Lisp and Scheme can also be enlightening.

To conclude: Hence we have gone through the different ways and steps on how to read a file in Python. Comment your views below in the comment section and do share the content. For some more of interesting and amazing content on web visit Morphigo.com and delve into some cool tech articles.

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