How do I work with list elements? | PYTHON

Question

I have a list, for example ['exa', 'mp', 'l', 'e'].

I need to work with each element to hexlify it. How do I want to do it? At first, I want to get each element somehow and then do hex(element). How do I get it? Or may be I can just hexlify the whole list?

Thanks in advance.

I want to say that I tried str(listname), but it just outputs "['exa', 'mp', 'l', 'e']" which doesn't fulfill my expectations.

What do you mean under `hex(element)`? Python's built-in `hex` function expects integer number but your element are `str`s. — Daweo, May 14 '20 at 13:58
Well, that's precisely what we want to see. Please update the question with this code and the output it produces and a reason why this doesn't fulfill your expectations. — quamrana, May 14 '20 at 14:00
Ok, that's better. So about those expectations, what are they exactly? — quamrana, May 14 '20 at 14:02
I want to see "exa", "mp", "l", "e" as, like, different variables or anything. But also as another option I want to hexlify the whole list and then separate it in variables like "hexvar", "otherhexvar", "lasthexvar" — , May 14 '20 at 14:04
Hmm, that's not very clear. Any way what exactly is `hexlify`? Also the `separate it in variables` seems a lot like [this](https://stackoverflow.com/questions/1373164/how-do-i-create-a-variable-number-of-variables) which is a no-no. — quamrana, May 14 '20 at 14:07
Hexlify is to make it in hex. Example: transform "exa", "mp", "l", "e" into "657861", "6d70", "6c", "65" — , May 14 '20 at 14:09

score 5 · Answer 1 · answered May 14 '20 at 13:57

5

Use list comprehension:

result = [hex(x) for x in arr]

answered May 14 '20 at 13:57

Michael Bianconi

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Can also use map() instead :) – bgmoshe May 14 '20 at 13:58
Yes, arr is your original list. List comprehension iterates through the list (each item is ```x```) and performs the operation ```hex(x)``` and stores it in result. There are a lot more complicated things you can do, but those are the basics – Michael Bianconi May 14 '20 at 14:00
This gives `TypeError: 'str' object cannot be interpreted as an integer` as the array contains strings. – David Buck May 14 '20 at 14:02
Yes, because you can't use ```hex()``` with strings. – Michael Bianconi May 14 '20 at 14:02
I will use binascii to hexlify with strings, don't worry. – May 14 '20 at 14:04

score 1 · Accepted Answer · answered May 14 '20 at 14:15

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The hexlify thing you are asking for can be done like this:

listname = ['exa', 'mp', 'l', 'e']
print([item.encode('utf-8').hex() for item in listname])

Output:

['657861', '6d70', '6c', '65']

answered May 14 '20 at 14:15

quamrana

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How do I work with list elements? | PYTHON

2 Answers2