Print file content in python

How to print the contents of a file in Python

In this article, we will learn how to print the contents of a file in python. We will be discussing multiple approaches to print the contents of a file. The file name and its contents which we will be using in the code is as follows,

File name: file.txt

Contents of the file

Hello world! python is very easy to learn

Table Of Contents

Printing the contents of a file using read()

In Python, a file object has a built-in read() method, and it takes the number of bytes to be read from the file as input and returns the specified number of bytes from the file. If no arguments are passed to the read() method then the entire contents of the file will be returned.

Frequently Asked:

1. Create an object of the file to be read using the open() method.
2. Call the read() method on the file object. It returns a string initialized with the contents of the file.
3. Print the string that contains the file contents.

Source Code

# opening the file fileObj=open("file.txt") # reading contents of the file fileContent=fileObj.read() # printing the contents of the file print(fileContent) # closing the file fileObj.close()

Hello world! python is very easy to learn

Syntax to get a file object :

The open() method opens a file and returns it as a file object.

• Parameters:
  • file_path : The path of the file.
  • mode : The mode in which the file needs to be opened. read (r), write (w), append (a). By default read mode.
  • Returns a file object.

  Syntax of read() method of file object

  • Parameters:
    • size : number of bytes to be read from the file, By default -1.
    • Contents of the file.

    Printing only the first n bytes of a file using read()

    To read the first n of bytes of the file, we need to pass the n value to the read() method, which will return a string with the first n bytes of the file.

    1. Create an object of the file to be read using the open() method.
    2. Call the read() method on the file object by passing n, for example, n=5. It returns a string initialized with the first 5 bytes of the file.
    3. Print the string.

    Source Code

    # opening the file fileObj=open("file.txt") # reading contents of the file fileContent=fileObj.read(5) # printing the contents of the file print(fileContent) # closing the file fileObj.close()

    Printing the contents of a file using readline()

    Python has a built-in readline() method, and it takes the number of bytes to be read from the line as input and returns the specified number of bytes from the line. If no arguments are passed to the readline() method, then one line of the file will be returned. If file pointer has reached the end of file, then it returns None.

    Syntax of readline() method

    • Parameters:
      • size : number of bytes to be read from the line, By default returns a single line.
      • Returns Contents of a single file.
      1. Create an object of the file to be read using the open() method.
      2. Call the readline() method on the file object in a loop till eof is reached.
      3. During loop, print each line/string returned by the readline() function.

      Source Code

      # opening the file fileObj=open("file.txt") fileContent = "None" while fileContent: # reading contents of the file fileContent = fileObj.readline() fileContent = fileContent.strip() # printing the contents of the file print(fileContent) # closing the file fileObj.close()

      Hello world! python is very easy to learn

      Printing the contents of a file using readlines()

      In Python, file object has a built-in readlines() method, and it returns a list of strings. Where, each string in the list represents a line in the file.

      Syntax of readlines() method

      • Parameters:
        • hint_size : Optional, If the number of bytes returned exceeds the hint_size then the remaining lines in the file will not be returned.
        • Returns file content as a list of strings.
        1. Create an object of the file to be read using the open() method.
        2. Call the readlines() method on the file object. It returns a list of strings, and each string in the list represents a line in the file.
        3. Print the list of strings.

        Source Code

        # opening the file fileObj=open("file.txt") # reading contents of the file fileContentList=fileObj.readlines() # printing the contents of the file for line in fileContentList: print(line.strip()) # closing the file fileObj.close()

        Hello world! python is very easy to learn

        Summary

        Great! you made it, We have discussed all possible methods to print the contents of a file in Python. Happy learning.

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        Источник

        How to Print the Content of a .txt File in Python?

        

        Given the path to a text file such as /path/to/file.txt .

        How to read all the content from the file and print it to the Python standard output?

        Standard File Reading and Printing

        The standard approach to read the contents from a file and print them to the standard output works in four steps:

        Let’s dive into each of those four steps next.

        Here’s how this whole process looks like on my computer:

        Step 1: Open the file for reading using the built-in open() function with the text file path as the first string argument and the reading mode ‘r’ as the second argument. Assign the resulting file object to a variable (e.g., named f ).

        Step 2: Read the whole textual content from the file using the file.read() method and store it in a variable (e.g., named content ). If your file consists of multiple lines, the resulting string will contain newline characters ‘\n’ for each line break.

        Step 3: Print the file content by passing the content variable into the built-in print() function.

        Step 4: Close the file to clean up your code. This is a good practice according to the Python standard.

        Taken together, the proper code to read the contents of a text file and print it to the standard output looks like this:

        f = open('/path/to/file.txt', 'r') content = f.read() print(content) f.close()

        Please note that you need to replace the string ‘/path/to/file.txt’ with your own path to the file you want to read.

        Do you need some more background? No problem, watch my in-depth tutorial about Python’s open() function:

        How to Read all Lines of a File into a List (One-Liner)?

        You can also read all lines of a file into a list using only a single line of code:

        print([line.strip() for line in open("file.txt")])

        To learn how this works, visit my in-depth blog article or watch the following video tutorial:

        How to Read a File Line-By-Line and Store Into a List?

        A more conservative, and more readable approach of achieving this is given in the following code snippet:

        with open('file.txt') as f: content = f.readlines() # Remove whitespace characters like '\n' at the end of each line lines = [x.strip() for x in content] print(lines)

        You can see this in action in this blog tutorial and the following video guide:

        Hey, you’ve read over the whole article—I hope you learned something today! To make sure your learning habit stays intact, why not download some Python cheat sheets and join our free email academy with lots of free Python tutorials?

        

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