The f means Formatted string literals and it’s new in Python 3.6.
A formatted string literal or f-string is a string literal that is
prefixed with ‘f’ or ‘F’. These strings may contain replacement
fields, which are expressions delimited by curly braces {}. While
other string literals always have a constant value, formatted strings
are really expressions evaluated at run time.
Some examples of formatted string literals:
>>> name = “Fred”
>>> f”He said his name is {name}.”
“He said his name is Fred.”
>>> name = “Fred”
>>> f”He said his name is {name!r}.”
“He said his name is Fred.”
>>> f”He said his name is {repr(name)}.” # repr() is equivalent to !r
“He said his name is Fred.”
>>> width = 10
>>> precision = 4
>>> value = decimal.Decimal(“12.34567″)
>>> f”result: {value:{width}.{precision}}” # nested fields
result: 12.35
>>> today = datetime(year=2017, month=1, day=27)
>>> f”{today:%B %d, %Y}” # using date format specifier
January 27, 2017
>>> number = 1024
>>> f”{number:#0x}” # using integer format specifier
0x400
the f string is also known as the literal string to insert a variable into the string and make it part so instead of doing
x = 12
y = 10
word_string = x + ‘ plus ‘ + y + ‘equals: ‘ + (x+y)
instead, you can do
x = 12
y = 10
word_string = f'{x} plus {y} equals: {x+y}’
output: 12 plus 10 equals: 22
this will also help with spacing due to it will do exactly as the string is written