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摘要： 1、An assignment statement creates a new variable and gives it a value: Variable names can be as long as you like. They can contain both letters and nu 阅读全文

摘要： 3.1 built-in function type(42)=> <class 'int'> int('32')=>32 int(3.9) => 3 int(-2.3)=>-2 float(32)=> 32.0 float('3.14159')=>3.14159 str(32) => '32' st 阅读全文