How to Read to End of File Python

Table of Contents Hide

1. Steps to Read Text File in Python
   1. Python open up() function
   2. Methods for Reading file contents
   3. Python close() function
2. Examples for Reading a Text file in Python
   1. Example 1 – Read the entire text file using the read() function
   2. Example 2 – Read the specific length of characters in a text file using the read() function
   3. Example 3 – Read a single line in a file using the readline() function
   4. Example 4- Read text file line by line using the readline() role
   5. Example 5 – Read all the lines as a list in a file using the readlines() part

Python provides built-in functions to perform file operations, such as creating, reading, and writing files. There are mainly two types of files that Python can handle, normal text files and binary files. In this tutorial, we will take a await at how to read text files in Python.

Steps to Read Text File in Python

In Python, to read a text file, you need to follow the beneath steps.

Step i: The file needs to be opened for reading using the open() method and pass a file path to the function.

Step 2: The next step is to read the file, and this tin can be achieved using several built-in methods such as read() , readline() , readlines() .

Step 3: In one case the read performance is performed, the text file must exist closed using the shut() part.

Now that nosotros take seen the steps to read the file content let's understand each of these methods before getting into examples.

Python open() function

The open() function opens the file if possible and returns the corresponding file object.

Syntax – open(file, mode='r', buffering=-1, encoding=None, errors=None, newline=None, closefd=True, opener=None)

The open() function has a lot of parameters. Let's take a await at the necessary params for reading the text file. It opens the file in a specified mode and returns a file object.

Parameters

• file – path like object which represents the file path
• style (Optional) – The mode is an optional parameter. It'southward a cord that specifies the style in which y'all desire to open up the file.

Mode	Clarification
'r'	Open up a file for read mode (default if mode is not specified)
'westward'	Open a file for writing. Python will create a new file if does not exist or truncates a file content if file exists
'x'	Open up a file for exclusive cosmos.
'a'	Open a file for appending the text. Creates a new file if file does non be.
't'	Open a file in text fashion. (default)
'b'	Open a file in binary mode.
'+'	Open a file for updating (reading and writing)

Example

              file = open('C:\hello.txt','r')            

Methods for Reading file contents

There are three ways to read data from a text file.

1. read() : The read() function returns the read bytes in the form of string. This method is useful when you take a small file, and you want to read the specified bytes or entire file and store it into a string variable.
2. readline() : The readline() function returns one line from a text file and retuns in the form of string.
3. readlines() : The readlines() function reads all the lines from the text file and returns each line as a string element in a list.

Python close() part

The file will remain open until yous shut the file using the close() function. Information technology is a must and best practise to perform this functioning after reading the data from the file as information technology frees up the retention space acquired by that file. Otherwise, information technology may cause an unhandled exception.

Examples for Reading a Text file in Python

Example one – Read the unabridged text file using the read() function

In the below example, nosotros are reading the entire text file using the read() method. The file tin can be opened in the read style or in a text way to read the information, and it tin can be stored in the string variable.

              # Program to read the entire file using read() function file = open("python.txt", "r") content = file.read() print(content) file.close()   # Program to read the entire file (absolute path) using read() function file = open("C:/Projects/Tryouts/python.txt", "r") content = file.read() print(content) file.close()            

Output

              Beloved User,  Welcome to Python Tutorial  Take a swell learning !!!  Cheers            

Example 2 – Read the specific length of characters in a text file using the read() office

In that location are times where you need to read the specific bytes in a file. In that instance, you lot can use the read() part by specifying the bytes. The method will output only the specified bytes of characters in a file, as shown beneath.

              # Program to read the specific length  # of characters in a file using read() part file = open up("python.txt", "r") content = file.read(20) impress(content) file.shut()                          

Output

              Dear User,  Welcome            

Instance three – Read a single line in a file using the readline() function

If you want to read a single line in a file, and so y'all could achieve this using readline() function. Y'all also apply this method to retrieve specific bytes of characters in a line, similar to the read() method.

              # Program to read unmarried line in a file using readline() function file = open("python.txt", "r") content = file.readline() print(content) file.close()            

Output

              Dear User,                          

Example 4- Read text file line by line using the readline() part

If you want to traverse the file line past line and output in any format, then you could use the while loop with the readline() method as shown below. This is the most effective mode to read the text file line by line in Python.

              # Program to read all the lines in a file using readline() function file = open up("python.txt", "r") while True: 	content=file.readline() 	if not content: 		break 	impress(content) file.shut()                          

Output

              Dear User,  Welcome to Python Tutorial  Have a neat learning !!!  Thank you            

Example 5 – Read all the lines every bit a list in a file using the readlines() role

The readlines() method will read all the lines in the file and outputs in a list of strings, as shown below. Later you can use the list to traverse and excerpt the specified content from the list.

              # Program to read all the lines equally a listing in a file #  using readlines() function  file = open up("python.txt", "r") content=file.readlines() print(content) file.close()                          

Output

              ['Beloved User,\due north', 'Welcome to Python Tutorial\n', 'Have a bully learning !!!\n', 'Thank you']            

Related Tags

• close(),
• mode,
• open(),
• read file content,
• read(),
• readline(),
• readlines()

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Source: https://itsmycode.com/python-read-text-file/

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