python 打印print与fprint

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 它是在 Python3.6 新加的字符串格式化方法，这种方法是在字符串前面加上 "f"，大括号直接使用变量，所以又叫 'f-strings'。

 

 

 

https://docs.python.org/3/reference/lexical_analysis.html#f-strings