f-strings.md

Input and Output 🐍 Python

Python 3's f-Strings:

1.1 “Old-school” String Formatting in Python

# optios #1 : %s

>>> name = "0xtz"
>>> age = 18
>>> "Hello, %s." % name
'Hello, 0xtz.'
# Option #2: str.format()
>>> "Hello, {}. You are {}.".format(0xtz, age)
'Hello, 0xtz. You are 19.'

>>> first_name = "0xtz"
>>> last_name = "Idle"
>>> age = 18
>>> profession = "comedian"
>>> affiliation = "Monty Python"
>>> print(("Hello, {first_name} {last_name}. You are {age}. " + 
>>>        "You are a {profession}. You were a member of {affiliation}.") \
>>>        .format(first_name=first_name, last_name=last_name, age=age, \
>>>                profession=profession, affiliation=affiliation))
'Hello, 0xtz Idle. You are 18. You are a comedian. You were a member of Monty Python.'

1.2 f-Strings: A New and Improved Way to Format Strings in Python :

Simple Syntax :

The syntax is similar to the one you used with str.format() but less verbose. Look at how easily readable this is: It would also be valid to use a capital letter F:

>>> name = "0xtz"
>>> age = 18
>>> f"Hello, {name}. You are {age}."
'Hello, 0xtz. You are 18.'
>>> #It would also be valid to use a capital letter F:
>>> F'Hello, {name}. You are {age}.'
'Hello, 0xtz. You are 18.'

Arbitrary Expressions

Because f-strings are evaluated at runtime, you can put any and all valid Python expressions in them. This allows you to do some nifty things.

F-strings are just amazing

class Comedian:
	'''  YOU CAN EVEN USE THEM INSIDE YOUR OBJ its just work '''
    def __init__(self, first_name, last_name, age):
        self.first_name = first_name
        self.last_name = last_name
        self.age = age

    def __str__(self):
        return f"{self.first_name} {self.last_name} is {self.age}."

    def __repr__(self):
        return f"{self.first_name} {self.last_name} is {self.age}. Surprise!"

You’d be able to do this:

>>> new_comedian = Comedian("0xtz", "Idle", "18")
>>> f"{new_comedian}"
'0xtz Idle is 18.'

for more info read the (the official DOCs)[https://docs.python.org/3/tutorial/inputoutput.html] i get those from realpython

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