How to turn a python variable into lower case?

Question

I would like to turn everything into a lowercase but no matter what i try it always brings back "AttributeError: 'list' object has no attribute 'lower'" what am i doing wrong?

user_input = input("")
    prohibited = {'this','although','and','as','because','but','even if','he','and','however','an','a','is','what','question :','question','[',']',',','cosmos',' ','  ','   ','cosmo'}
    tokens = [word for word in re.split("\W+", user_input) if word.lower() not in prohibited]
    tokens.sort(key=len, reverse=True)
    words = str(tokens).split()
    TokenCount = len(words)
    tokens = tokens.lower()

lower is a string method. tokens is a list of strings.

hpaulj
– hpaulj

2019-08-01 04:40:58 +00:00
Commented Aug 1, 2019 at 4:40 — hpaulj
– hpaulj, Commented Aug 1, 2019 at 4:40
yes.. is there a way around that?

Zehmy
– Zehmy

2019-08-01 04:43:41 +00:00
Commented Aug 1, 2019 at 4:43 — Zehmy
– Zehmy, Commented Aug 1, 2019 at 4:43
you can use map to use the lower for every element in list

Albin Paul
– Albin Paul

2019-08-01 04:44:17 +00:00
Commented Aug 1, 2019 at 4:44 — Albin Paul
– Albin Paul, Commented Aug 1, 2019 at 4:44
tokens=list(map(lambda x:x.lower(),tokens))

Albin Paul
– Albin Paul

2019-08-01 04:44:50 +00:00
Commented Aug 1, 2019 at 4:44 — Albin Paul
– Albin Paul, Commented Aug 1, 2019 at 4:44

Sayandip Dutta · Accepted Answer · 2019-08-01 04:46:51Z

2

You can add a lambda expression to map the str.lower() calls to elements of list. Instead of your last line, try this:

tokens = list(map(lambda x: x.lower(), tokens))

answered Aug 1, 2019 at 4:46

Sayandip Dutta

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Comments

Shubham Singhal · Accepted Answer · 2019-08-01 04:55:23Z

1

You can do this with a one line for loop:

tokens = [t.lower() for t in tokens]

This applies the string operation 'lower()' to each element of the list and then compiles them again into a list (the [] brackets).

answered Aug 1, 2019 at 4:55

Shubham Singhal

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