Reading String From Text File Is Empty Python

Table of Contents Hide

1. Steps to Read Text File in Python
   1. Python open() 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() office
   2. Example ii – Read the specific length of characters in a text file using the read() role
   3. Example 3 – Read a unmarried line in a file using the readline() function
   4. Example iv- Read text file line by line using the readline() part
   5. Instance 5 – Read all the lines equally a list in a file using the readlines() office

Python provides built-in functions to perform file operations, such as creating, reading, and writing files. In that location are mainly 2 types of files that Python tin handle, normal text files and binary files. In this tutorial, nosotros volition accept a wait at how to read text files in Python.

Steps to Read Text File in Python

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

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

Step ii: The next pace is to read the file, and this can be achieved using several congenital-in methods such as read() , readline() , readlines() .

Step 3: Once the read operation is performed, the text file must be closed using the close() function.

At present that we accept seen the steps to read the file content let'south understand each of these methods earlier getting into examples.

Python open() office

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

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

The open() role has a lot of parameters. Let'due south have a look at the necessary params for reading the text file. Information technology opens the file in a specified mode and returns a file object.

Parameters

• file – path like object which represents the file path
• mode (Optional) – The way is an optional parameter. It's a string that specifies the fashion in which yous want to open the file.

Mode	Description
'r'	Open up a file for read mode (default if style is not specified)
'due west'	Open up a file for writing. Python volition create a new file if does not be or truncates a file content if file exists
'10'	Open up a file for sectional cosmos.
'a'	Open up a file for appending the text. Creates a new file if file does not exist.
't'	Open up a file in text way. (default)
'b'	Open a file in binary style.
'+'	Open a file for updating (reading and writing)

Case

              file = open('C:\how-do-you-do.txt','r')            

Methods for Reading file contents

At that place are iii ways to read information from a text file.

1. read() : The read() function returns the read bytes in the form of string. This method is useful when yous have a small-scale file, and you want to read the specified bytes or entire file and shop it into a cord variable.
2. readline() : The readline() part 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 every bit a string element in a list.

Python shut() function

The file will remain open until you lot shut the file using the shut() function. Information technology is a must and best do to perform this performance after reading the data from the file as it frees upwardly the memory space caused by that file. Otherwise, it may cause an unhandled exception.

Examples for Reading a Text file in Python

Example 1 – Read the entire text file using the read() function

In the below example, we are reading the unabridged text file using the read() method. The file can be opened in the read style or in a text way to read the data, and it 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 unabridged file (accented path) using read() function file = open("C:/Projects/Tryouts/python.txt", "r") content = file.read() impress(content) file.close()            

Output

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

Instance two – Read the specific length of characters in a text file using the read() function

There are times where y'all need to read the specific bytes in a file. In that instance, y'all can utilise the read() function by specifying the bytes. The method will output merely the specified bytes of characters in a file, as shown below.

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

Output

              Love User,  Welcome            

Instance 3 – Read a single line in a file using the readline() office

If yous desire to read a single line in a file, and then you lot could reach this using readline() function. You also use this method to retrieve specific bytes of characters in a line, similar to the read() method.

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

Output

              Honey User,                          

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

If you want to traverse the file line by 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 way to read the text file line by line in Python.

              # Program to read all the lines in a file using readline() function file = open("python.txt", "r") while True: 	content=file.readline() 	if non content: 		suspension 	print(content) file.close()                          

Output

              Dear User,  Welcome to Python Tutorial  Have a great learning !!!  Cheers            

Example 5 – Read all the lines as a list in a file using the readlines() function

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

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

Output

              ['Beloved User,\n', 'Welcome to Python Tutorial\due north', 'Take a great learning !!!\northward', 'Cheers']            

Related Tags

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

Sign Up for Our Newsletters

Get notified of the all-time deals on our WordPress themes.

By checking this box, you confirm that you lot have read and are agreeing to our terms of utilize regarding the storage of the data submitted through this course.

salleydubtep.blogspot.com

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

Share this post