Python 如何从列表中的列表中删除包含非数值的单元格

我有一个列表，其中包含包含数字和文本的子列表。 我想完全删除文本

所以清单是这样的：

sample_list = [['hello','there'],['1','2.0','3'],['564','text','65.976']]

我一直在尝试的是

list_without_text = [[item for item in sublist] for sublist in sample_list if item.isdigit()==True ]

但是我得到了NameError:没有定义名称“item”

有什么想法吗

---

编辑：列表中的所有项目都是字符串，有些项目仍然带有数字、字母和/或小数点。

您弄错了，

item.isdigit（）

if条件应该在子列表中。范例-

list_without_text = [[item for item in sublist  if item.isdigit()==True] for sublist in sample_list]

但这只适用于所有元素都是字符串，并且您希望删除非整数的字符串/浮点。这不包括

2.0

等数字

为此，您可以使用如下函数-

def isnum(s):
    try:
        float(s)
        return True
    except ValueError:
        return False

list_without_text = [[item for item in sublist  if isnum(item) ] for sublist in sample_list]

---

示例/演示-

>>> l = [["Hello","1"],["2.0","Bye"]]
>>> def isnum(s):
...     try:
...         float(s)
...         return True
...     except ValueError:
...         return False
...
>>> list_without_text = [[item for item in sublist  if isnum(item) ] for sublist in l]
>>> list_without_text
[['1'], ['2.0']]

代码：

lst= [["hello","there",],[1,2.0,3],[564,"text",65.976]]

[[ b for b in i if not isinstance(b, basestring)]for i in lst]

[[], [1, 2.0, 3], [564, 65.976]]

lst= [["hello","there",],["1","2.0","3"],["564","text","65.976"]]

[[ b for b in i if not b.isalpha()]for i in lst]

[[], ['1', '2.0', '3'], ['564', '65.976']]

输出：

lst= [["hello","there",],[1,2.0,3],[564,"text",65.976]]

[[ b for b in i if not isinstance(b, basestring)]for i in lst]

[[], [1, 2.0, 3], [564, 65.976]]

lst= [["hello","there",],["1","2.0","3"],["564","text","65.976"]]

[[ b for b in i if not b.isalpha()]for i in lst]

[[], ['1', '2.0', '3'], ['564', '65.976']]

如果您的列表中满是

字符串

代码：

lst= [["hello","there",],[1,2.0,3],[564,"text",65.976]]

[[ b for b in i if not isinstance(b, basestring)]for i in lst]

[[], [1, 2.0, 3], [564, 65.976]]

lst= [["hello","there",],["1","2.0","3"],["564","text","65.976"]]

[[ b for b in i if not b.isalpha()]for i in lst]

[[], ['1', '2.0', '3'], ['564', '65.976']]

输出：

lst= [["hello","there",],[1,2.0,3],[564,"text",65.976]]

[[ b for b in i if not isinstance(b, basestring)]for i in lst]

[[], [1, 2.0, 3], [564, 65.976]]

lst= [["hello","there",],["1","2.0","3"],["564","text","65.976"]]

[[ b for b in i if not b.isalpha()]for i in lst]

[[], ['1', '2.0', '3'], ['564', '65.976']]

---

它们都是字符串吗，只是有些可能是只包含数字的字符串。将列表列为变量名？对不起，列表不是实际的变量名，举个例子，我会更改。是的，它们都是StringsHanks，我在问题中忘记了逗号，列表中的所有项目实际上都是stringsGreat，非常感谢。我会投票给你，但我是新来的，没有代表：|没关系，我想建议你接受答案，点击答案左侧的勾号，这对社区很有帮助。不过列表中的所有元素都是字符串，谢谢