iteration doesn't seem to work ??

[stef]

hello,

can someone tell me why the following iteration doesn't work,
and
how I should replace empty strings in a list with a default value.

>>> v ['123', '345', '', '0.3']
>>> for items in v:

.... if items=='':
.... items='3'
....

>>>
>>> v ['123', '345', '', '0.3']
>>>

thanks,
Stef Mientki

 

[half.italian]

hello,

can someone tell me why the following iteration doesn't work,
and
how I should replace empty strings in a list with a default value.

v ['123', '345', '', '0.3']
for items in v:

... if items=='':
... items='3'
...

v ['123', '345', '', '0.3']

thanks,
Stef Mientki

Inside the loop, 'items' is no longer referencing the list...its a
string.

v = ['123', '4', '567', '']
for i in v:

.... print type(i)
....
<type 'str'>...

This works
.... if i=='':
.... v[j] = '3'
....

v ['123', '4', '567', '3']

~Sean

 

[stef]

hello Sean,

thanks very much for the explanation and solution.

cheers,
Stef Mientki

hello,

can someone tell me why the following iteration doesn't work,
and
how I should replace empty strings in a list with a default value.

v ['123', '345', '', '0.3']
for items in v:

... if items=='':
... items='3'
...

v ['123', '345', '', '0.3']

thanks,
Stef Mientki

Inside the loop, 'items' is no longer referencing the list...its a
string.

v = ['123', '4', '567', '']
for i in v:

... print type(i)
...
<type 'str'>...

This works

... if i=='':
... v[j] = '3'
...
['123', '4', '567', '3']


~Sean

 

[Ant]

hello,

can someone tell me why the following iteration doesn't work,
and
how I should replace empty strings in a list with a default value.

See the other reponse for the why. Here's another how, using list
comprehension.:

1 > v = ['123', '345', '', '0.3']
2 > v = [x if x else '3' for x in v]
3 > v
3 = ['123', '345', '3', '0.3']

Note that this replaces the list, so won't be appropriate for
modifying a list passed in from elsewhere.