I`m poor in english.please run my code,Thanks.

def rv(list):
    for i in list:
        #print(type(i))
        #print(i.__len__())
        if (i.isspace() or i=='' or len(i)==0):
            list.remove(i)
    return list
list=['k', '', '', '', 'v', '', 'e', '', '', '', '73', '', 'p', '76', '']
print(rv(list))#['k', 'v', 'e', '73', '', 'p', '76', '']
The result still have empty str,I need to filter again.The reason is more empty val is linked.is a bug?or some reason?

Not a bug. Use this instead:

def rv(items):
    for item in items[:]:  # iterate over a copy
        if not (item.isspace() or item == ''):
            items.remove(item)
    return items


Or the same as above, as a list comprehension, no need to make a copy:

items = [item for item in items if not (item.isspace() or item == '')]

Thanks,Very timely resolve my problem

To understand why your code doesn't work, run this:

items = ['a', '', 'b', '', 'c', '', 'd', '', 'e', '']

print(len(items))

for index, item in enumerate(items):
    print(index, repr(item), items)
    if item == '':
        items.remove('')


When you remove an item, all the remaining items slide over one position, into the slot that has already been inspected. That means that they get skipped.

Yes,I remember that my error in Java,like you say it`s skiped

------------------ 原始邮件 ------------------
发件人: "Python tracker"<report@bugs.python.org&gt;; 
发送时间: 2021年8月19日(星期四) 中午12:53
收件人: "海"<1979239641@qq.com&gt;; 
主题: [issue44952] list need to filter again because the continue empty str value?

Steven D'Aprano <steve+python@pearwood.info&gt; added the comment:

To understand why your code doesn't work, run this:

items = ['a', '', 'b', '', 'c', '', 'd', '', 'e', '']

print(len(items))

for index, item in enumerate(items):
&nbsp;&nbsp;&nbsp; print(index, repr(item), items)
&nbsp;&nbsp;&nbsp; if item == '':
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; items.remove('')

When you remove an item, all the remaining items slide over one position, into the slot that has already been inspected. That means that they get skipped.

----------
resolution:&nbsp; -&gt; not a bug

_______________________________________
Python tracker <report@bugs.python.org&gt;
<" rel="noopener" target="_blank">https://bugs.python.org/issue44952&gt;;
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