3 Useful Python F-string Tricks You Probably Don’t Know https://jerrynsh.com/3-useful-python-f-string-tricks-you-probably-dont-know/

f-string-0.py

viewer = "🐊"
owner = "🐼"
editor = "🐓"

print(viewer)
print(owner)
print(editor)

f-string-1.py

print(f"{viewer=}")
print(f"{owner=}")
print(f"{editor=}")

# Stdout:

# viewer = "🐊"
# owner = "🐼"
# editor = "🐓"

f-string-10.py

from datetime import datetime


now = datetime.now()

# Using repr()
print(repr(now))


# F-string way
print(f'{now!r}')

# Stdout
# datetime.datetime(2021, 7, 5, 13, 2, 34, 672383)

repr(now) == f'{now!r}'
# True

f-string-2.py

print(f"{viewer=     }")
print(f"{owner     =}")
print(f"{editor     =      }")

# Stdout:

# viewer=     '🐊'
# owner     ='🐼'
# editor     =      '🐓'

f-string-3.py

# The "old" ways of updating float to 2 decimal places
float_variable = 3.141592653589793

print("%.2f" % float_variable)
print("{:.2f}".format(float_variable))

# Stdout:

# 3.14
# 3.14

f-string-4.py

float_variable = 3.141592653589793

print(f"{float_variable:.2f}")

# Stdout:
# 3.14

f-string-5.py

money = 3_142_671.76 # 💡 This is the same as 3142671.76

print(f"${money:,.2f}")

# Stdout:
# $3,142,671.76

f-string-6.py

from datetime import datetime


now = datetime.now()

# The usual way
formatted_datetime_now = now.strftime('%d-%B-%Y')
print(formatted_datetime_now)

# F-string way
formatted_datetime_now = f"{now:%d-%B-%Y}"
print(formatted_datetime_now)

# Stdout
# 05-July-2021

f-string-7.py

# Output length of 20, and pad the rest with zeroes

int_variable = 1_234_567
print(f'{int_variable:020}')

# Stdout
# 00000000000001234567


# Output length of 24, and pad the rest with zeroes
int_variable = 30
print(f'{int_variable:024}')

# Stdout
# 000000000000000000000030

f-string-8.py

# Output length of 10, and pad the rest with leading whitesplace
int_variable = 20_21
print(f'{int_variable:10d}')

# Stdout
# '      2021'


# Output length of 5, and pad the rest with leading whitesplace
print(f"{int_variable:5d}")

# Stdout
# ' 2021'

f-string-9.py

owl = '🦉'
print(f'{owl!a}')

# Stdout
# '\U0001f989'