如何从列表中删除所有零

Question

I want to remove all zeros from the list after sorting in descending order.

for x in range (1,count):
    exec("col"+str(x) + "=[]")


with open (xvg_input, 'r') as num:

    line_to_end = num.readlines()
    for line in line_to_end:
        if "#" not in line and "@" not in line:
            line=list(map(float,line.split()))
            for x in range (2,count):
                exec("col" +str (x)+ ".append(line["+ str(x-1) + "])")
                exec("col" +str(x) + ".sort(reverse = True)")
                exec("while (col"+str(x) + ".count(0.000)):")
                exec("col" +str(x) +".remove(0.000)")

I am getting the syntax error. I am not getting where I am doing wrong. I just want to sort in descending order and delete all the zeroes.

Answer 1

Does this make sense

def remove_values(the_list, val):
   return [value for value in the_list if value != val]

x = [1, 0, 3, 4, 0, 0, 3]
x = remove_values(x, 0)
print x
# [1, 3, 4, 3]

Answer 2

Try using filter method:

list = [9,8,7,6,5,4,3,2,1,0,0,0,0,0,0]
filter(lambda x: x != 0,a) #iterates items, returning the ones that meet the condition in the lambda function
# [9, 8, 7, 6, 5, 4, 3, 2, 1]