Working with lists

•

What is DaniWeb IT Discussion Community?

You're currently browsing the Python section within the Software Development category of DaniWeb, a massive community of 456,533 software developers, web developers, Internet marketers, and tech gurus who are all enthusiastic about making contacts, networking, and learning from each other. In fact, there are 2,886 IT professionals currently interacting right now! Registration is free, only takes a minute and lets you enjoy all of the interactive features of the site.

Join our community!

Please support our Python advertiser: Programming Forums

Thread Tools Display Modes

Views: 1123 | Replies: 11

Page 2 of 2

•

Join Date: May 2007

Posts: 268

Reputation: BearofNH is on a distinguished road

Rep Power: 2

Solved Threads: 19

BearofNH

Offline

Posting Whiz in Training

Re: Working with lists

#11

Oct 11th, 2007

•

Originally Posted by MrShoot

(...)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:
Help with Code Tags

python Syntax (Toggle Plain Text)
list = ["CAnADA", "hELLO", "CAN"]
list = ["CAnADA", "hELLO", "CAN"]
I want it to show up like:
["Canada", "hello", "Can"]

I recommend avoiding using variable names like list as it can get very confusing. Anyhow, a list comprehension could help here:

 Help with Code Tags 
 python Syntax (Toggle Plain Text) 
mylist  = ["CAnADA", "hELLO", "CAN"]
newlist = [ x[0]+x[1:].lower() for x in mylist ]
print newlist
mylist  = ["CAnADA", "hELLO", "CAN"]
newlist = [ x[0]+x[1:].lower() for x in mylist ]
print newlist

['Canada', 'hello', 'Can']

Things get a bit hairer if you allow empty strings in mylist, but that's an exercise for the reader.

•

Join Date: Aug 2005

Posts: 1,196

Reputation: Ene Uran is on a distinguished road

Rep Power: 6

Solved Threads: 67

Ene Uran

Offline

Veteran Poster

Re: Working with lists

#12

Oct 11th, 2007

If you have empty strings in the list you can change BearofNH's code simply:

 Help with Code Tags 
 python Syntax (Toggle Plain Text) 
mylist  = ["CAnADA", "hELLO", "", "CAN"]
# use list comprehension
newlist = [ x[0]+x[1:].lower() for x in mylist if x ]
print newlist
"""
my output -->
['Canada', 'hello', 'Can']
 
a list comprehension is a more efficient way of coding this ...
newlist =[]
for x in mylist:
    if x != "":
        newlist.append(x[0]+x[1:].lower())
"""
mylist  = ["CAnADA", "hELLO", "", "CAN"]
# use list comprehension
newlist = [ x[0]+x[1:].lower() for x in mylist if x ]
print newlist
"""
my output -->
['Canada', 'hello', 'Can']

a list comprehension is a more efficient way of coding this ...
newlist =[]
for x in mylist:
    if x != "":
        newlist.append(x[0]+x[1:].lower())
"""