name|num|num|num|num name|num|num|num|num name|num|num|num|num
How i can sort this list on need me field (2,3,4,5) ? Sorry for my enlish.
Update
Input:
str|10|20
str|1|30
Sort by first field (1,10):
str|1|30
str|10|20
Sort by second field(20,30):
str|10|20
str|1|30
I would use the operator module function "itemgetter" instead of the lambda functions. That is faster and allows multiple levels of sorting.
from operator import itemgetter
data = (line.split('|') for line in input.split('\n'))
sort_index = 1
sorted(data, key=itemgetter(sort_index))
sorted(...) in a variable, as it doesn't sort in place (and in-place sorting with data.sort() isn't available for generators). But you probably meant that.
You can sort on a specific key, which tells the sort function how to evaluate the entries to be sorted -- that is, how we decide which of two entries is bigger. In this case, we'll first split up each string by the pipe, using split (for example, "a|b|c".split("|") returns ["a", "b", "c"]) and then grab whichever entry you want.
To sort on the first "num" field:
sorted(lines, key=(lambda line : line.split("|")[1])
where lines is a list of the lines as you mention in the question. To sort on a different field, just change the number in brackets.
Assuming you start with a list of strings, start by splitting each row into a list:
data = [line.split('|') for line in input]
Then sort by whatever index you want:
sort_index = 1
sorted_data = sorted(data, key=lambda line: int(line[sort_index]))
The Python sorting guide has a lot more information.
