- Python Basic Programs
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- Python Print Hello World
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- Check Reverse equal Original
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- Python Check Armstrong or Not
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- Python Check Perfect Number
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- Python Count Digits in Number
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- Interchange Digits of Number
- Python Sum of n Numbers
- Python Print ASCII Values
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- Python Swap Two Variables
- Python Fahrenheit to Celsius
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- Python Display Calendar
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- Python Print Fibonacci Series
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- Python Make Simple Calculator
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- Binary Number Multiplication
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- Find Sum of Natural Numbers
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- Python Print Multiplication Table
- Print Table using Recursion
- Python Find Average Percentage
- Python Find Grade of Student
- Find Square Root of Number
- Python Print Prime Numbers
- Find Numbers Divisible by
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- Python Find Factorial of a Number
- Python Find HCF & LCM
- Python Kilometres to Miles
- Python Find Area of Square
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- Python Find Area of Circle
- Python Find Perimeter of Square
- Find Perimeter of Rectangle
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- Find Circumference of Circle
- Python Simple Interest
- Python Solve Quadratic Equation
- Python Different Set of Operations
- Python Display Powers of 2
- Python Find nCr & nPr
- Python Pattern Programs
- Python Print Pattern Programs
- Python Print Diamond Pattern
- Python Print Floyd's Triangle
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- Python List Programs
- Python Count Even/Odd in List
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- Python Sum of Elements in List
- Sum of Odd/Even Numbers
- Python Element at Even Position
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- Python Search Element in List
- Python Largest Number in List
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- Python Second Largest in List
- Python Second Smallest in List
- Python Insert Element in List
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- Python Multiply Numbers in List
- Swap Two Elements in List
- Python 1D Array Program
- Python Linear Search
- Python Binary Search
- Python Insertion Sort
- Python Bubble Sort
- Python Selection Sort
- Remove Duplicates from List
- Python Reverse a List
- Python Merge Two List
- Python Copy a List
- Python Conversion Programs
- Python Decimal to Binary
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- Python Decimal to Hexadecimal
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- Python Octal to Decimal
- Python Octal to Binary
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- Python Hexadecimal to Decimal
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- Python Hexadecimal to Octal
- Python Matrix Programs
- Python Add Two Matrices
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- Python Transpose Matrix
- Python Multiply Matrices
- Python String Programs
- Python Print String
- Python Find Length of String
- Python Compare Two Strings
- Python Copy String
- Python Concatenate String
- Python Reverse a String
- Python Swap Two Strings
- Python Uppercase to Lowercase
- Python Lowercase to Uppercase
- Python Check Substring in String
- Python Count Character in String
- Count Repeated Characters
- Python Count Word in Sentence
- Python Count Each Vowels
- Python Capitalize Character
- Python Capitalize Word in String
- Python Smallest/Largest Word
- Remove Spaces from String
- Remove Duplicate Character
- Remove Vowels from String
- Remove Punctuation from String
- Python Remove Word in String
- Python Remove Duplicate Words
- WhiteSpace to Hyphens
- Replace Vowels with Character
- Replace Character in String
- Python Sort String in Alphabetical
- Sort Word in Alphabetical Order
- Extract Number from String
- Python Check Anagram Strings
- Python File Programs
- Python Read a File
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- Python Append Text to File
- Python Copy Files
- Python Merge Two Files
- Python Counts Characters in File
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- Python File Content in Reverse
- Python Lines Contains String
- Python Delete Line from File
- Python Capitalize Word in File
- Python Replace Text in File
- Replace Specific Line in File
- Python Find Size of File
- Python List Files in Directory
- Python Delete Files
- Python Misc Programs
- Python Reverse a Tuple
- Python Merge Two Dictionary
- Python bytes to String
- Python bytearray to String
- Generate Random Numbers
- Python Print Address of Variable
- Python Print Date and Time
- Python Get IP Address
- Python Shutdown/Restart PC
- Python Tutorial
- Python Tutorial
Python Program to Replace Text in a File
This article is created to cover some programs in Python that replaces text in file. Here are the list of programs available in this article:
- Replace specific text with new text in file
- Replace specific text in file and print new content
Things to do before Program
Since the program given below operates on file. Therefore a text file say codescracker.txt must be available in the current directory (the folder where the Python program's source code is saved). Therefore create a file with following content:
My name is codescracker.txt You are learning Python.
and save this as codescracker.txt. Here is the snapshot of the file created in the current directory:
And here is the snapshot of the opened file named codescracker.txt:
Now let's move on and create a program that replaces some text with new text as provided by user at run-time, from the file.
Replace Text with New Text in File
The question is, write a Python program that replaces any particular text available in a file with a new text. Here the name of file, old text to search, and new text to replace with, must be entered by user at run-time. The answer to this question is the program given below:
print("Enter the Name of File: ") filename = input() filehandle = open(filename, "r") content = filehandle.read() filehandle.close() print("Enter text to search: ") text = input() print("Enter text to replace with: ") replace = input() if text in content: content = content.replace(text, replace) filehandle = open(filename, "w") filehandle.write(content) filehandle.close() print("\nThe text is replaced!") else: print("Not Found!")
The snapshot given below shows the initial output produced by this Python program:
Now supply all the inputs as asked by program and required by you. After providing inputs say codescracker.txt as file name, learning as text to search, practicing as text to replace, here is the sample run with exactly same inputs:
Now if you see the same file as created above, the content of it gets changed. That is, in place of learning, you will see the text practicing will be available. Here is the new snapshot of the opened file named codescracker.txt:
Replace Text from File and See New Content
Now I've changed the content of file, codescracker.txt with content as shown in the following snapshot:
Now let's create the modified version of previous program, that replaces text from given file and prints old and new content of the file:
print("Enter File's Name: ", end="") filename = input() filehandle = open(filename, "r") content = filehandle.read() filehandle.close() print("Enter text to search for: ", end="") text = input() print("Enter text to replace with: ", end="") replace = input() oldcontent = content if text in content: content = content.replace(text, replace) filehandle = open(filename, "w") filehandle.write(content) filehandle.close() print("\nThe text is replaced successfully!") print("\n-------Old Content-------") print(oldcontent) print("\n------New Content-------") print(content) else: print("\nNot Found!")
Here is its sample run with user input, codescracker.txt as file's name, Python as text to search for, JavaScript as text to replace with:
And here is the new snapshot of the same file after executing the above program:
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