A data type basis Introduction
When variables are defined in python is no need to declare type.
Data types can be divided into the python numeric and non-numeric type.
Digital type: integer, float, boolean, a complex type.
Non-numeric type: strings, lists, tuples, dictionaries.
You can view using the type of a variable types: type (variable name)
Second, the calculated data between different types
1 can be directly calculated between the digital type;
2. Use of type string for string concatenation +;
* 3. The string can be repeated string concatenation, for example, "nihao" * 3, the result is "nihaonihaonihao";
It can not be any other computing between 4 and numeric strings;