Read Txt File Until a Key Word
Table of Contents Hide
- Steps to Read Text File in Python
- Python open up() function
- Methods for Reading file contents
- Python shut() function
- Examples for Reading a Text file in Python
- Example 1 – Read the entire text file using the read() function
- Example 2 – Read the specific length of characters in a text file using the read() function
- Example three – Read a single line in a file using the readline() function
- Example four- Read text file line by line using the readline() office
- Example 5 – Read all the lines every bit 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 two types of files that Python tin can handle, normal text files and binary files. In this tutorial, we will take 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 below steps.
Pace one: The file needs to exist opened for reading using the open up() method and pass a file path to the function.
Stride 2: The next step is to read the file, and this can be achieved using several built-in methods such as read() , readline() , readlines() .
Footstep 3: Once the read operation is performed, the text file must be closed using the close() role.
Now that we have 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, fashion='r', buffering=-1, encoding=None, errors=None, newline=None, closefd=True, opener=None)
The open up() function has a lot of parameters. Let'south have 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
manneris an optional parameter. It's a string that specifies the mode in which you want to open the file.
| Mode | Description |
|---|---|
'r' | Open a file for read manner (default if manner 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 style. (default) |
'b' | Open up a file in binary style. |
'+' | Open a file for updating (reading and writing) |
Example
file = open up('C:\hi.txt','r') Methods for Reading file contents
There are three 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 you accept a pocket-size file, and yous want to read the specified bytes or unabridged file and store it into a cord variable. -
readline(): Thereadline()role 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 every bit a string element in a list.
Python close() function
The file volition remain open until you lot close the file using the close() function. It is a must and best do to perform this operation after reading the information from the file as information technology frees upward the memory infinite acquired by that file. Otherwise, information technology may cause an unhandled exception.
Examples for Reading a Text file in Python
Example ane – 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 style or in a text fashion to read the information, and it tin be stored in the string variable.
# Programme to read the entire file using read() office file = open up("python.txt", "r") content = file.read() print(content) file.close() # Programme to read the unabridged file (absolute path) using read() function file = open("C:/Projects/Tryouts/python.txt", "r") content = file.read() impress(content) file.shut() Output
Dear User, Welcome to Python Tutorial Accept a groovy 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 example, you can utilise the read() function by specifying the bytes. The method volition output only 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) impress(content) file.shut() Output
Dear User, Welcome Case 3 – Read a single line in a file using the readline() office
If you want to read a single line in a file, then yous could achieve this using readline() office. Yous also use this method to retrieve specific bytes of characters in a line, similar 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 past line using the readline() role
If you want to traverse the file line by line and output in any format, and so you could use the while loop with the readline() method as shown below. This is the most constructive 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 not content: suspension print(content) file.shut() Output
Dear User, Welcome to Python Tutorial Have a great learning !!! Cheers 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 beneath. Later yous can apply the list to traverse and extract the specified content from the listing.
# Program to read all the lines as a list in a file # using readlines() role file = open up("python.txt", "r") content=file.readlines() print(content) file.close() Output
['Dear User,\n', 'Welcome to Python Tutorial\n', 'Have a great learning !!!\northward', 'Cheers'] 
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Source: https://itsmycode.com/python-read-text-file/
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