# scientific notion with number of decimals after period
big_number: int = 1_620_000_000
print(f'{big_number:.2e}')

# format dates on the fly
from datetime import datetime
now: datetime = datetime.now()
print(f'{now:%d.%m.%y}')

# nesting f-strings
number: float = 1000000.1234567
spec: str = ',.2f'
print(f'{number:{spec}')

# r before a string escapes escape characters, and this can be used in tandem with f-strings
print(rf'{}')

# debug with f-strings
a: float = 0.1
b: float = 0.2
print(f'{a + b = :.1f}')

# 
from datatime import datetime, date
banana: str = '🍌'
name: str = 'Bob'
today: date = datetime.now().date()
print(f'[{today!s}] {name!s} says: {banana!s}') # string representation per variable
print(f'[{today!r}] {name!r} says: {banana!r}') # representation of each variable
print(f'[{today!a}] {name!a} says: {banana!a}') # ASCII representation of each variable