如何在 Python 的列表中替换列表中的项目

Question

Now i just want to replace the min, max value with the x in the table.... and i dont know how to...

for i in table[1:]:
    mn = min(i) if min(i) < mn else mn 
    mx = max(i) if max(i) > mx else mx
    x = (mn+mx)/2

Answer 1

The following should work:

def remove_outliers(table):
    mx = max(map(max, table))
    mn = min(map(min, table))
    avg = (mx + mn) / 2

    for row in table:
        row[:] = [avg if x in (mx, mn) else x for x in row]
    # OR
    for row in table:
        for i, x in enumerate(row):
            if x in (mx, mn):
                row[i] = avg

max(map(max, table)) : applies the max function to each row in table , and takes the max of all those "maxes".

row[:] =... : slice-assignment. This is a mutation on the row object. Simply row =... would just rebind the loop variable without affecting the list object that is still indexed by table .

[avg if x in (mx, mn) else x for x in row] : general conditional list comprehension. Fairly self-explanatory.

Answer 2

If you are using numpy check out the clip function ( https://docs.scipy.org/doc/numpy/reference/generated/numpy.clip.html ).