Built in function bin（）,oct（）,hex（） Used to convert integers to binary , Octal and hexadecimal forms , All three functions require that the argument must be an integer .
If necessary, calculate the average value of all elements in the list ,
sum（）/len（）
<>str
str（） Directly convert any type of parameter to a string
<>min max
max（） and min（） of key Parameters can be used to specify comparison rules
<>sorted
sorted（） Function pair list , tuple , Dictionaries , Collection or other iteratable object to sort and return a new list
<>reversed
reversed（） Flip the iteratable object and return the iteratable object reversed object .
<>enumerate
Used to enumerate elements in an iteratable object , Return iteratable enumerate object , Each of these elements is a tuple containing an index and a value
<>map
map（） Put a function func Map to each element of the sequence or iterator object in turn , And returns an iteratable map Object as a result
map Each element in the object is the function of the element in the original sequence func Results after treatment
<>discard
discard and remove:
discard No error will be reported when deleting non-existent elements , and remove() Method will cause an error when removing a non-existent element
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