Joaquim Santos wrote:
Hi list!
After this past week of no PC and no work, I'm again at the Python
Challenge Cypher problem.
I decided to go with the flow and solve it with maketrans (6 lines of
code against the 40 and going I had already...) and it solved it
quickly and clean!
However, and please be sure I don't want to re-invent any wheel, I
still got some doubts unexplained...
- How to correctly populate a list using, for instance, a for loop;
In general:
mylist = []
for value in some_sequence:
mylist.append( process(value) )
Here's a concrete example: take a list of words, convert to lower case, and
make them plural:
words = ['CAT', 'DOG', 'TREE', 'CAR', 'PENCIL']
plurals = []
for word in words:
word = word.lower()
plurals.append(word + 's')
print(plurals)
- how to correctly use join to read the said list in a human friendly way...
I don't understand this question. You can't use join to read a list. Perhaps
you mean to use join to print a list? Specifically, you use join to build a
single string from a list of sub-strings.
Given plurals above, we can build a single list of words separated by double
spaces and a hyphen:
print(' - '.join(plurals))
To join a list of single characters into a string, use join on the empty
string. Compare:
chars = ['a', 'b', 'c', 'd']
print(' '.join(chars))
print(''.join(chars))
--
Steven
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