Python Read File Starting From a Specific Line
Table of Contents Hibernate
- Steps to Read Text File in Python
- Python open() function
- Methods for Reading file contents
- Python close() function
- Examples for Reading a Text file in Python
- Example 1 – Read the unabridged text file using the read() function
- Example 2 – Read the specific length of characters in a text file using the read() function
- Example 3 – Read a unmarried line in a file using the readline() function
- Example 4- Read text file line past line using the readline() function
- Case 5 – Read all the lines as 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. There are mainly two types of files that Python can handle, normal text files and binary files. In this tutorial, nosotros will have a expect 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.
Pace 1: The file needs to exist 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 can be achieved using several built-in methods such as read() , readline() , readlines() .
Stride three: Once the read operation is performed, the text file must be airtight using the close() function.
Now that we have seen the steps to read the file content let's sympathise 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, style='r', buffering=-i, encoding=None, errors=None, newline=None, closefd=True, opener=None)
The open up() office has a lot of parameters. Let'due south have a wait at the necessary params for reading the text file. It opens the file in a specified style and returns a file object.
Parameters
- file – path similar object which represents the file path
- fashion (Optional) – The
modeis an optional parameter. It'southward a cord that specifies the mode in which you want to open the file.
| Mode | Description |
|---|---|
'r' | Open a file for read mode (default if mode is not specified) |
'west' | 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 a file for exclusive creation. |
'a' | Open a file for appending the text. Creates a new file if file does not be. |
't' | Open a file in text mode. (default) |
'b' | Open a file in binary style. |
'+' | Open a file for updating (reading and writing) |
Example
file = open up('C:\hello.txt','r') Methods for Reading file contents
There are three ways to read data from a text file.
-
read(): Theread()part returns the read bytes in the form of cord. This method is useful when you have a small file, and you desire to read the specified bytes or entire file and store it into a string variable. -
readline(): Thereadline()part returns one line from a text file and retuns in the form of string. -
readlines(): Thereadlines()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 you close the file using the close() function. It is a must and all-time exercise to perform this operation after reading the information from the file as information technology frees up the retentiveness 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 entire text file using the read() function
In the below example, we are reading the entire text file using the read() method. The file can be opened in the read mode or in a text fashion to read the data, and information technology tin can be stored in the string variable.
# Program to read the unabridged file using read() function file = open("python.txt", "r") content = file.read() impress(content) file.close() # Program to read the entire file (absolute path) using read() role file = open up("C:/Projects/Tryouts/python.txt", "r") content = file.read() print(content) file.close() Output
Honey 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 you need to read the specific bytes in a file. In that case, you can use the read() function by specifying the bytes. The method will output simply 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.shut() Output
Dear User, Welcome Example 3 – Read a unmarried line in a file using the readline() part
If you desire to read a single line in a file, and then y'all could attain this using readline() function. Yous besides use this method to call back specific bytes of characters in a line, like to the read() method.
# Program to read single line in a file using readline() function file = open("python.txt", "r") content = file.readline() print(content) file.close() Output
Dear User, Instance 4- Read text file line by line using the readline() function
If you desire to traverse the file line past line and output in any format, then you could apply the while loop with the readline() method as shown below. This is the about 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("python.txt", "r") while True: content=file.readline() if not content: break print(content) file.close() Output
Dear User, Welcome to Python Tutorial Have a slap-up learning !!! Thank you Case five – 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. Afterwards you can use the list to traverse and extract the specified content from the list.
# Plan to read all the lines as a list in a file # using readlines() role file = open up("python.txt", "r") content=file.readlines() impress(content) file.close() Output
['Dear User,\due north', 'Welcome to Python Tutorial\due north', 'Have a bang-up learning !!!\north', 'Cheers'] 
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Source: https://itsmycode.com/python-read-text-file/
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