Ref: https://stackoverflow.com/questions/9197324/what-is-the-meaning-of-curly-braces {}大括弧在PYTHON的2種用法: "Curly Braces" are used in Python to define a dictionary. A dictionary is a data structure that maps one value to another - kind of like how an English dictionary maps a word to its definition. Python: 1. dict = { "a" : "Apple" , "b" : "Banana" , } 2. They are also used to format strings, instead of the old C style using %, like: ds = [ 'a' , 'b' , 'c' , 'd' ] x = [ 'has_{} 1' . format ( d ) for d in ds ] print x [ 'has_a 1' , 'has_b 1' , 'has_c 1' , 'has_d 1' ]
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