1.filter (arg1, arg2)
The first parameter is None or a function object, the second is a summary of iterable data
: if the first parameter is None, then the corresponding value in the second parameter is filtered out, if it is a function, then the function returns Take out the true value
2.map(arg1,arg2)
arg1 is the function, arg2 is the iterable data
Summary: return a data set consisting of function return values
