Python - Convert file content to uppercase

Introduction

The following code reads a file line by line, printing the uppercase version of each line, without ever explicitly reading from the file at all:

Demo

for line in open('main.py'):       # Use file iterators to read by lines 
    print(line.upper(), end='')       # Calls __next__, catches StopIteration

Result

The print uses end='' here to suppress adding a \n, because line strings already have one.

Related Topic

• Text File
• Storing Python Objects in Files
• Strip Text File Content
• Split Text File Content
• Convert Text File Content to Python object
• Load text file to memory and read
• Read a file line by line with a while loop:

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