n00bprogrammer22 n00bprogrammer22 - 1 year ago 96
Python Question

Creating tuple of letter and its row and column in list of lists

I need to write a function that creates a tuple in the format ('letter', row, col) of all letters in a list of lists. I realized I could combine two functions I've already written to accomplish this. One function I wrote get_letters(lst) extracts all the letters from the list of lists and the other one I wrote extracts the row and column.

There must be a way to combine these two functions to accomplish this goal without creating a new one but I'm not sure how I would do it. Here's the code for these two functions:

def get_letters(lst):
letters = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
newlst = []

for sublist in lst:
for i in sublist:

if i in symbols and i not in newlst:

#Example output: (1, 0)

return newlst

def find_letter(letter, lst):
for i in range(len(lst)):
for j in lst[i]:
if j == letter:
return i ,lot[i].index(j)

#Example output: ['A']

#New function example output: [('A', 1, 0)]

#Example input for both above functions: lst2 =

Answer Source
[(letter, i, j) for i, sublist in enumerate(list_of_list) for j, letter in enumerate(sublist) if letter.isalpha()]

Is one way to do it with enumerate. If you can't use enumerate for some reason, you can just roll your own:

def not_enumerate_i_swear(iterable):
    i = 0
    for item in iterable:
        yield (i, item)
        i += 1
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