用Python分割句子

Question

Please input string: Python and Perl are programming languages

Python
Perl
and
are 
programming
languages

I want an input to be split but the upper case words go on top. I am thinking of using two lists: one with the title case words and one with lower. I am trying to use an if statement to place the words in a certain list. Please suggest some ideas!

Thanks

Answer 1

Your example output is wrong, because it would look like this:

Perl
Python
and
are
languages
programming

Sorting by capital first would result in Perl above Python because e comes first. Additionally, because uppercase comes first you can simply do

print "\n".join(sorted(a.split()))

to get the desired result.

EDIT: After rereading the question I came up with this fix/output:

print "\n".join(sorted(a.split(), key=lambda x: x >= 'a'))

Output:

Python
Perl
and
are
programming
languages

Explanation: sorting functions in Python are stable , which means the order of elements is preserved relative to each other if they have the same comparison key. The key function will assign a value of True to anything that is greater or equal to 'a' (which is any string starting with a lowercase letter), else False . False compares smaller than True , so anything uppercase is moved to front, without changing the order of uppercase or lowercase words.

Answer 2

If it is a homework, you should give it a tag "homework". Anyway, the idea to use two lists is not bad.

1. Initialize the two lists to empty ones.
2. Split the input sentence using the .split() method of the string to get the words.
3. Use the split expression directly in the for loop to process the extracted words.
4. If word is the string variable, then word[0] is its first character. If it is less or equal to 'Z' it is a capitalized word and should be appended to the wanted list.
5. Use '\\n'.join(lst) to get the multiline string out of the list of words.