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Views: 1123 | Replies: 11
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Join Date: Oct 2007
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Newbie Poster
Hi, this is my first forum message so I'll make a brief introduction. I'm from Canada and I am Computer Science student. I enjoy working with computers, specially web programming. It has come to my attention (and also a school requirement) to learn Python. So here I am with my first question:
Suppose I have the following list:
And I want to make each element from list lowercase. This is what I have so far:
That will lowercase each of my elements. Up till that part everything is fine. However, let's say I want to return the string again, but this time. With all its elements properly lowercased. And this is where I'm stuck. I can't think of a way to do this.
Any help / ideas / suggestions will be greatly appreciated.
Suppose I have the following list:
python Syntax (Toggle Plain Text)
And I want to make each element from list lowercase. This is what I have so far:
python Syntax (Toggle Plain Text)
That will lowercase each of my elements. Up till that part everything is fine. However, let's say I want to return the string again, but this time. With all its elements properly lowercased. And this is where I'm stuck. I can't think of a way to do this.
Any help / ideas / suggestions will be greatly appreciated.
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Join Date: Jun 2007
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Light Poster
>>> LIST = ["CANADA", "HELLO", "I TOLD YOU SO"]
>>> conv_list=[]
>>> for el in LIST:
conv_list +=[el.lower()]
>>> conv_list
['canada', 'hello', 'i told you so'] •
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Join Date: Oct 2007
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Newbie Poster
Interesting, could you explain me a bit this part?
What exactly would the += do there?
python Syntax (Toggle Plain Text)
What exactly would the += do there?
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Join Date: Sep 2007
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Newbie Poster
Re: Working with lists •
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Originally Posted by StrikerX11 
>>> LIST = ["CANADA", "HELLO", "I TOLD YOU SO"] >>> conv_list=[] >>> for el in LIST: conv_list +=[el.lower()] >>> conv_list ['canada', 'hello', 'i told you so']
You might also try:
list_in = ["CANADA", "HELLO", "I TOLD YOU SO"] list_out = [] for element in list_in: list_out.append(element.lower()]
Python has a nifty feature called list comprehensions that would also make a good solution, but if you haven't come across them yet don't worry:
list_in = ["CANADA", "HELLO", "I TOLD YOU SO"] list_out = [element.lower() for element in list_in]
- Paddy.
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Join Date: Oct 2004
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Originally Posted by MrShoot
Interesting, could you explain me a bit this part?
python Syntax (Toggle Plain Text)
What exactly would the += do there?
python Syntax (Toggle Plain Text)
python Syntax (Toggle Plain Text)
May 'the Google' be with you!
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Join Date: Oct 2007
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Newbie Poster
Perfect, yes I was aware of the append method. That's the way I did it after Striker put his solution up. I just didn't see it all the way through. Thanks a lot folks.
Now let me complicate this a bit more. What if I only want to lowercase all the letters but the first letter from each string included in the list? For example, we have:
I want it to show up like:
["Canada", "hello", "Can"]
I was thinking in using an if-else statement but I don't know whether to check the first letter for each string on a list is capital or not.
Now let me complicate this a bit more. What if I only want to lowercase all the letters but the first letter from each string included in the list? For example, we have:
python Syntax (Toggle Plain Text)
I want it to show up like:
["Canada", "hello", "Can"]
I was thinking in using an if-else statement but I don't know whether to check the first letter for each string on a list is capital or not.
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Join Date: Oct 2007
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Newbie Poster
Hi
you can check the first letter:
[code = python]
for el in my_list:
conv_list.append(el[0] + el[1:].lower())
[/code]
el[1:] = the string without the first char
for example:
el = "CAnADA"
el[0] = "C"
el[1:] = "AnADA"
el[1:].lower() = "anada"
el[0] + el[1:].lower() = "Canada" - as you want
you can check the first letter:
[code = python]
for el in my_list:
conv_list.append(el[0] + el[1:].lower())
[/code]
el[1:] = the string without the first char
for example:
el = "CAnADA"
el[0] = "C"
el[1:] = "AnADA"
el[1:].lower() = "anada"
el[0] + el[1:].lower() = "Canada" - as you want
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Join Date: Oct 2007
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Newbie Poster
Wow, what a beauty. I guess I got confused about adding data from each element to the list. You sir are a genious, thanks a lot!
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Join Date: Sep 2007
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Newbie Poster
This should help:
- Paddy.
>>> s = 'CAnADA' >>> s.capitalize() 'Canada' >>>
- Paddy.
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Join Date: Jul 2006
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Posting Pro
depending on what you want ...
strings have number of powerful methods; you might poke around with
dir(str)
and
help(str.M), where M is some method name.
Jeff
Python Syntax (Toggle Plain Text)
strings have number of powerful methods; you might poke around with
dir(str)
and
help(str.M), where M is some method name.
Jeff
Last edited by jrcagle : Oct 8th, 2007 at 11:12 am.
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