Python 3.6 introduced, formatted string literals, often referred to as f-strings as another method to help format strings. It is simpler to prepend an f to the string then append .format().
Format String (f-string)#
These are the basic f-string formatting that I use commonly in Python scripting.
## Basic: Formatting/Value/Output
## https://github.com/myseq/notes/blob/main/Python/f-string.md
Formatting | Value | Output
================================================
{num:0>2d} | 5 | num = 05
{num:,} | 5000000 | num = 5,000,000
{num:.2e} | 5000000 | num = 5.00e+06
("%.2f" % pi) | 3.141592654 | pi = 3.14
"{:.2f}".format(pi) | 3.141592654 | pi = 3.14
{:.2f} | 3.141592654 | pi = 3.14
{:+.2f} | 3.141592654 | pi = +3.14
{:.0f} | 3.141592654 | pi = 3
{num:.2%} | 0.25 | num = 25.00%
{num:>10} | 0.25 | num = 0.25
{num:<10} | 0.25 | num = 0.25
{num:^10} | 0.25 | num = 0.25
{num:0>9} | 0.25 | num = 000000.25
'{0} >= {1}'.format('A','B') | A >= B
'{1} <= {0}'.format('A','B') | B <= A
'%s loves %s'% ('cats','dogs') | cats loves dogs
'{} hates {}'.format('cats','dogs') | cats hates dogs
{now:%Y-%m-%d %H:%M} | now() = 2023-07-21 17:20
{today:%Y-%m-%d %H:%M} | today() = 2023-07-21 17:20
{utcnow:%Y-%m-%d %H:%M} | utcnow() = 2023-07-21 09:20
email_f = "Your email address is {email}".format
email_address = "_user@example.com_"
"Your email address is _user@example.com_"
Debugging#
To print the variable name togather with the result.
var = 'text'
print(f'{var =}')