新手python问题，求大佬们帮忙
Smart stats
Write a module called stats that contains two functions:
mean - returns the mean of a list (average)
std - returns the sample standard deviation of a list
Requirements
Parameters: data (list)
Both functions must only accept a list input. When something other than a list is passed to the function then the function should immediately end and return None.
Both functions should ignore non-numeric values in the list.
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