what is wrong with this line

[jenya56]

list[1].extend(data_ncdc[il][3])

it gives me an error that 'str' object has no attribute 'extend'. but I also tried

list[1].extend(float(data_ncdc[il][3]))

Anybody? THANKS

[bvdet]

You should not use "list" as an identifier. The assignment masks the built-in Python function "list()".

You are receiving the error because "list[1]" is a str object, which has no append() method. Use print statements in your code prior to the error to see what the object is.

[jenya56]

Yes, I did print all of these.....
However, in my program I have:

 if coord_ind == None:
    ncdc_station.append(data_ncdc[il][3])
 else:
    ncdc_station[coord_ind[0]].extend(data_ncdc[il][3])

In this program append works just fine but then I go to extend it does not. I thought that if extend does not work, append will not either?
Could you please help me to correct this problem. THANKS

[bvdet]

Please use code tags when posting code.

append() and extend() are list methods and will fail on str objects. It's hard for me to know what is going on with your data.

>>> a = [1,2,3]
>>> a.extend('a')
>>> a
[1, 2, 3, 'a']
>>> a.extend([1,2,3])
>>> a
[1, 2, 3, 'a', 1, 2, 3]
>>> 's'.extend([3,4,5])
Traceback (most recent call last):
  File "<interactive input>", line 1, in ?
AttributeError: 'str' object has no attribute 'extend'
>>> 's'.append(1)
Traceback (most recent call last):
  File "<interactive input>", line 1, in ?
AttributeError: 'str' object has no attribute 'append'
>>> 

[jenya56]

well, I have array a=['0','1','2','3']. I need now to do the following val1='9', then set
a=['0',['1','9'],'2','3']. Is there a way to do it? Thanks.

[Glenton]

In [5]: a=['0','1','2','3']
 
In [6]: type(a[1])
Out[6]: <type 'str'>
 
In [7]: a[1]=list(a[1])
 
In [8]: a
Out[8]: ['0', ['1'], '2', '3']
 
In [9]: a[1].append('9')
 
In [10]: a
Out[10]: ['0', ['1', '9'], '2', '3']
 

[Glenton]

You just need to be clear about what type a variable is. Appending to a string is not valid.