# this file available at: https://arachnoid.com/files/python01/
import datetime
import math

def main():
    
    n = 123456789.12345678
    print('variable: n = 123456789.12345678')

    print('Currency format raw code: {n:,.2f}')
    print(f'Currency format f-string: {n:,.2f}')
    print()

    for n in range(30,60,10):
        s = f'Text Alignment: width {n}'
        print(f'|{s:<{n}}|')
        print(f'|{s:>{n}}|')
        print(f'|{s:^{n}}|')
        print()
    print()

    now : datetime = datetime.datetime.now()  # type: ignore

    print('variable now = datetime = datetime.datetime.now()\n')

    for arg in ('','%Y.%m.%d %H:%M:%S','%y.%m.%d %H:%M %p','%c'):
        print(f'date/time string format : {{now:{arg}}}')
        print(f'date/time f-string      : {now:{arg}}')
    print()

    print('width string format:  "width = {w:2}, pi = {math.pi:.{w}}"\n')
    for w in range(2,18,4):
        print(f'width = {w:2}, pi = {math.pi:.{w}}')

    teststring = 'The class of {item} is "{type(item).__name__}"'

    print(f'\nF-strings can contain Python code! Test String: "{teststring}"\n')

    print('Results for various Python entities:\n')

    for item in [1.234,3,False,[],(),range,math,datetime,main]:
        print(f'\tThe class of {item} is "{type(item).__name__}"')



if __name__ == "__main__":
    main()