f string formatting code example
Example 1: python f-strings
>>> name = "Fred"
>>> f"He said his name is {name!r}."
"He said his name is 'Fred'."
>>> f"He said his name is {repr(name)}."
"He said his name is 'Fred'."
>>> width = 10
>>> precision = 4
>>> value = decimal.Decimal("12.34567")
>>> f"result: {value:{width}.{precision}}"
'result: 12.35'
>>> today = datetime(year=2017, month=1, day=27)
>>> f"{today:%B %d, %Y}"
'January 27, 2017'
>>> f"{today=:%B %d, %Y}"
'today=January 27, 2017'
>>> number = 1024
>>> f"{number:#0x}"
'0x400'
>>> foo = "bar"
>>> f"{ foo = }"
" foo = 'bar'"
>>> line = "The mill's closed"
>>> f"{line = }"
'line = "The mill\'s closed"'
>>> f"{line = :20}"
"line = The mill's closed "
>>> f"{line = !r:20}"
'line = "The mill\'s closed" '
Example 2: python f string
name = 'Psych4_3.8.3'
age = 23
job = 'programmer'
print("I am %s a %t of age %u", %(name, job, age))
print(f"I am {name} a {job} of age {age}")
Example 3: format specificer f strings python
val = 12.3
print(f'{val:.2f}')
print(f'{val:.5f}')