Function, copy depth, variable and non-variable

7.31 Wednesday 
variable and immutable:
        immutable: Just change the value of the variable address changes, it is considered this type is immutable 
                int str float tuple bool 
       variable types: content changes, but the address does not change, it is considered this type is a variable 
                 list set dict 
shallow vs. deep copy:
         copy: in fact, the data in the container, to keep a copy of the new address 
       shallow copy of: variable-type common to the same address (the contents of which vary, address will not change) 
               immutable type is a common beginning, but if there is a change in the address will change 
               list1.copy () copy.copy (list1) 
       deep copy: type variable element in the list, there is a new address, rather than a common address as a shallow copy 
               copy.deepcopy (list1) 

function : Objective: to reduce code redundancy, so that some duplicate custom code in the function 
      parameters: Common parameters, the default value of the parameter, the key word parameter, the variable parameter, unpacking, the bundles 
            number of parameters: the number of the calling number when the function when the function defined in claim To same 
      type parameter: str int float bool tuple - "immutable parameter is given a value (passed value)
                   list set dict --- "variable type transfer function is the address (transfer address) 
      Default parameters: when the function definition, provided a fixed value (eg: b = 10) of a parameter 
                  in the definition of the default values time must be placed behind the argument, otherwise an error 
      keyword argument: when calling the expressly stated by way of keywords which parameter values to the 
      variable parameters: def function name (* args, ** kwargs): 
                args ---> () will all positional parameters underlying stored in args 
               kwargs -> {} keyword dictionary resets all of the parameters into a dictionary 
      returns the value 



















'' '