What does 'f' means before a string in Python?

Question

I\'m new here and also new to Python. I wonder what does f in print(f\'Column names are {\"-\".join(row)}\') do I tried deleting it and then \'Column n

Answer 1

This is called f-strings and are quite straightforward : when using an "f" in front of a string, all the variables inside curly brackets are read and replaced by there value. For example :

    age = 18
    message = f"You are {age} years old"
    print(message)

Will return "You are 18 years old"

This is similar to str.format (https://docs.python.org/3/library/stdtypes.html#str.format) but in a more concise way.