Search for text in files in python how to#
Search for text in files in python code#

Search for text in files in python code#

So the find method looks for bytes and not for strings.Īn example code for this is given below: import mmap However, in Python3 and above, mmap doesn’t behave like the string-like object but creates a bytearray object. S = mmap.mmap(f.fileno(), 0, access=mmap.ACCESS_READ) The mmap.mmap() method creates a string-like object in Python 2 that checks the implicit file only and does not read the whole file.Īn example code in Python 2 is given below: # python 2 The mmap module can also be used to find a string in a file in Python and can improve the performance if the file size is relatively big. Use mmap Module to Search a String in a File in Python It returns 0 if the string is found and -1 if the string is not found.Īn example code is given below. read() This method reads the entire file and returns a single string containing all the contents of the file. There are three ways to read a text file in Python.

Search for text in files in python how to#

We will discuss how to read a text file in Python. Python provides inbuilt functions to read, create and write text files. The find method is passed the required string. A text file is the file containing simple text. Use find Method to Search a String in a File in PythonĪ simple find method can be used with the read() method to find the string in the file. Then we can use the in operator to check whether the string is in the returned string.Īn example code is given below: file = open('temp.txt', 'w') The file read() method returns the content of the file as a whole string. Use the File read() Method to Search a String in a File in Python Return False # The string does not exist in the file If the string is not found after iterating all lines, it returns False eventually.Īn example code for this approach is given below: file = open('temp.txt', 'w') If the string is found in the line, it returns True and breaks the loop. We can use the for loop to iterate through the list and use the in operator to check whether the string is in the line in every iteration. Pyton file readlines() method returns the file content split to a list by the new line. Use the File readlines() Method to Find a String in a File in Python The tutorial explains how to find a specific string in a text file in Python. Use mmap Module to Search a String in a File in Python.Use find Method to Search a String in a File in Python.Use the File read() Method to Search a String in a File in Python.Use the File readlines() Method to Find a String in a File in Python.