so if i have like 100 sublists in have to replace strings into integer L = ['2013', 'Patrick', 'M', '2566']
I must convert 2013 and such numbers into integer for all the sublists. I tried: Assume 4 elements per sublist newlist = [map(int,x) for x in L[0][:5]]
but obviously I keep getting error because 'patrick' cannot be converted.
you can you simple list comprehension :)
results = [int(i) if i.isdigit() else i for i in L]
Another option is to catch ValueError and fallback to original value, if more flexibility is needed than one-liner provides:
L = ['2013', 'Patrick', 'M', '2566']
def try_convert(string):
try:
return int(string)
except ValueError:
return string
newlist = map(try_convert, L)
Results in:
[2013, 'Patrick', 'M', 2566]
Try this, iterate your main list, and rebuilt sublists converting to int depending on isdigit() function:
>>> #your main list
>>> huge_list = [
... ['2013', 'Patrick', 'M', '2566'],
... ['1', 'Bob', 'M', '25']
... ]
>>> #for each sublist, convert only the elements that are numbers (using isdigit() function)
>>> for idx, sublist in enumerate(huge_list):
... huge_list[idx] = [
... int(el) if el.isdigit() else el
... for el in sublist
... ]
...
>>> huge_list
[[2013, 'Patrick', 'M', 2566], [1, 'Bob', 'M', 25]]
