Split list with string and numbers as string to two in order to float them

Question

Hi i need to split a list that contains string. Some of the strings are words, other are numbers.

I have to float them

x = ['2','45','0.34','4.5','text','wse','56',]

what i tried:

FloatList = [x for x in Mylist if isinstance(x, float)]

but it prints empty list:

[]

Can you point me where am I wrong.

So I need to filter the words from the number strings, float the strings in sep. list

Remi Guan · Accepted Answer · 2015-12-08T08:45:09.070

1

These are all string objects, '1.2' isn't 1.2:

>>> type('1.2')
<class 'str'>
>>> type(1.2)
<class 'float'>
>>>

You should covert them to float object before check.

Since float() function will raise a ValueError if it failed to covert the string that you gives it, you could use try...except to catch that error:

>>> l = []
>>> x = ['2','45','0.34','4.5','text','wse','56'] 
>>> for i in x:
...     try:
...         l.append(float(i))
...     except ValueError:
...         pass

>>> l
[0.34, 4.5, 2, 45, 56]

edited Dec 08 '15 at 08:45

answered Dec 08 '15 at 07:25

Remi Guan

21,506
17
64
87

Maybe OP wants also 2, 45 and 56 as floats, in which case you would need to remove the test about '.' – DainDwarf Dec 08 '15 at 07:31
@DainDwarf: Yep, however I'm not sure, since OP want to get *floats*, not `float` and `int`. – Remi Guan Dec 08 '15 at 07:40
Oh, I've edited. Remember accept an answer if it's helpful. – Remi Guan Dec 08 '15 at 08:45
how can I accept it? Sorry I am totally new in this (my first question) – George G. Dec 08 '15 at 09:09
@GeorgeG.: No problem, just click the grey checkmark on the left side of my answer, it'll become green. Check our [tour] and [help] center for more details ;) (in this case, [tour] is enough). – Remi Guan Dec 08 '15 at 09:13
done, thank you, I actually just was checking it with hope to find the answer – George G. Dec 08 '15 at 09:18

Split list with string and numbers as string to two in order to float them

1 Answers1