CODEWITHSUNDEEP
pythonlistpython-3.x
bycheetah
bycheetah

Reputation: 13

Merging floats in list

I have a list that consists of this:

[['Esté', 'Double', 'Medium', ' £10 ', '0.5', nan, nan, nan, 254.0, 239.0, 224.0, 717.0],
['Esté', 'Double', 'Medium', ' £10 ', '1.0', nan, nan, nan, 248.0, 224.0, 205.0, 677.0]]

I wish for the first three floats to be merged together like this:

[['Esté', 'Double', 'Medium', ' £10 ', '0.5', nan, nan, nan, 254239224, 717.0],
['Esté', 'Double', 'Medium', ' £10 ', '1.0', nan, nan, nan, 24822205, 677.0]]

I need to leave the final float as its own element. The three floats need to change data type to int (to remove the decimal place) and then they need to be merged together as one element. I am having great trouble as to how I can do this.

e.g.

254.0, 239.0, 224.0 --> 254239224

Upvotes: 0

Views: 501

Answers (4)

Deba
Deba

Reputation: 609

You may use map and lambda for this operation

map(lambda x: x[:-4]+[int(''.join(map(str, (map(int, x[-4:-1])))))]+[x[-1]], list_of_lists)

output:

[['Esté', 'Double', 'Medium', ' £10 ', '0.5', nan, nan, nan, 254239224, 717.0],['Esté', 'Double', 'Medium', ' £10 ', '1.0', nan, nan, nan, 24822205, 677.0]]

Upvotes: 0

Keerthana Prabhakaran
Keerthana Prabhakaran

Reputation: 3787

You need to iterate through your input to get each list. From there, use list slicing to get the n-4 to n-1 elements to merge and make as a part of your list!

Since those elements are floats and you want the output as a string ignoring the decimals, you can use lambda to iterate over every element in each[-4:-1] eg. [254.0, 239.0, 224.0], convert that to int and then to string. ['254', '239', '224.0'] with be the result. And to merge them, use str.join()! And then, insert the merged result to the right position of your list!

That is, 

print [each[:-4]+[''.join(map(lambda x:str(int(x)),each[-4:-1]))]+[each[-1]] for each in r]

Upvotes: 0

Dan
Dan

Reputation: 1884

To join these floats 254.0, 239.0, 224.0 --> 254239224

for l in list_of_lists:
  floats = l[index_of_first_float:index_of_last_float+1]
  concat = ''.join([str(int(f)) for f in floats])
  ...

Upvotes: 0

Prune
Prune

Reputation: 77860

I'll divide this into three steps for easier understanding; you can make this a single-line derivation.

slice = src[-4:-1] # This grabs the three items
big_str = ''.join([str(int(x)) for x in slice])
big_int = int(big_str)

After this, just plaster your original item back together:

src = src[:-4] + [big_int] + src[-1]

Does that get you moving?

Upvotes: 1

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