How to Read a File Until End in Python
Table of Contents Hide
- Steps to Read Text File in Python
- Python open() function
- Methods for Reading file contents
- Python close() part
- Examples for Reading a Text file in Python
- Example i – Read the entire text file using the read() function
- Example 2 – Read the specific length of characters in a text file using the read() role
- Instance 3 – Read a unmarried line in a file using the readline() function
- Instance four- Read text file line by line using the readline() function
- Example five – Read all the lines equally a list in a file using the readlines() function
Python provides built-in functions to perform file operations, such as creating, reading, and writing files. There are mainly ii types of files that Python can handle, normal text files and binary files. In this tutorial, we volition have a look 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 below steps.
Step 1: The file needs to exist opened for reading using the open() method and pass a file path to the function.
Step 2: The side by side step is to read the file, and this tin can exist accomplished using several built-in methods such as read() , readline() , readlines() .
Step 3: Once the read functioning is performed, the text file must be closed using the shut() office.
Now that we 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 respective file object.
Syntax – open(file, mode='r', buffering=-one, encoding=None, errors=None, newline=None, closefd=True, opener=None)
The open() function has a lot of parameters. Permit'southward take a look at the necessary params for reading the text file. It opens the file in a specified way and returns a file object.
Parameters
- file – path like object which represents the file path
- mode (Optional) – The
modeis an optional parameter. It'southward a string that specifies the fashion in which y'all desire to open the file.
| Mode | Clarification |
|---|---|
'r' | Open a file for read mode (default if mode is non specified) |
'w' | Open up a file for writing. Python will create a new file if does not be or truncates a file content if file exists |
'x' | Open a file for exclusive creation. |
'a' | Open a file for appending the text. Creates a new file if file does not exist. |
't' | Open a file in text mode. (default) |
'b' | Open up a file in binary mode. |
'+' | Open up a file for updating (reading and writing) |
Instance
file = open('C:\hello.txt','r') Methods for Reading file contents
There are 3 ways to read data from a text file.
-
read(): Theread()function returns the read bytes in the form of string. This method is useful when yous have a pocket-size file, and you want to read the specified bytes or unabridged file and shop it into a string variable. -
readline(): Thereadline()role returns one line from a text file and retuns in the grade of string. -
readlines(): Thereadlines()function reads all the lines from the text file and returns each line as a cord element in a list.
Python close() office
The file volition remain open until you close the file using the close() function. It is a must and all-time do to perform this operation afterwards reading the data from the file as information technology frees up 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 unabridged 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 mode or in a text mode to read the data, and it can exist stored in the string variable.
# Program to read the entire file using read() office file = open("python.txt", "r") content = file.read() impress(content) file.close() # Program to read the entire file (absolute path) using read() function file = open up("C:/Projects/Tryouts/python.txt", "r") content = file.read() impress(content) file.close() Output
Dear User, Welcome to Python Tutorial Have a great learning !!! Cheers Example 2 – 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 example, you can use the read() function by specifying the bytes. The method volition output but the specified bytes of characters in a file, as shown beneath.
# Program to read the specific length # of characters in a file using read() function file = open("python.txt", "r") content = file.read(twenty) print(content) file.close() Output
Dear User, Welcome Example 3 – Read a single line in a file using the readline() office
If you want to read a unmarried line in a file, so y'all could achieve this using readline() function. You too apply this method to retrieve specific bytes of characters in a line, similar to the read() method.
# Plan to read unmarried line in a file using readline() part file = open("python.txt", "r") content = file.readline() impress(content) file.close() Output
Dear User, Example 4- Read text file line past line using the readline() role
If you want to traverse the file line by line and output in whatsoever format, then you could use the while loop with the readline() method equally shown below. This is the nearly effective way to read the text file line by line in Python.
# Plan to read all the lines in a file using readline() function file = open("python.txt", "r") while True: content=file.readline() if not content: break impress(content) file.close() Output
Dearest User, Welcome to Python Tutorial Have a cracking 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 listing of strings, as shown below. Later yous can use the list to traverse and extract the specified content from the list.
# 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
['Dear User,\n', 'Welcome to Python Tutorial\n', 'Take a nifty learning !!!\n', 'Cheers'] 
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Source: https://itsmycode.com/python-read-text-file/
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