added example for f-string

Literal string interpolation is new in python 3.6 [pep-0498](https://www.python.org/dev/peps/pep-0498/)
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理絵子 2018-07-29 11:53:33 +09:00 committed by GitHub
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@ -138,6 +138,10 @@ len("This is a string") # => 16
# still use the old style of formatting:
"%s can be %s the %s way" % ("Strings", "interpolated", "old") # => "Strings can be interpolated the old way"
# You can also format using f-strings or formatted string literals
name = "Reiko"
f"She said her name is {name}." # => "She said her name is Reiko"
# None is an object
None # => None