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15.倒序
Reverse Word Order 
strings
Exercise 15 (and Solution)
Write a program (using functions!) that asks the user for a long string containing multiple words. Print back to the user the same string, except with the words in backwards order. For example, say I type the string:
My name is Michele
Then I would see the string:
Michele is name My
shown back to me.
Discussion
Concepts for this week:
More string things
Python has a lot of interesting things you can do with strings. I will show a few here, but you can see many more methods that may or may not be useful at the official Python documentation about the string format.
Remember that strings are lists.
Splitting strings
You can “split” or tear apart strings based on a given set of characters. For example:
teststring = "this is a test"
result = teststring.split("t")
And at the end, result will contain the list:
['', 'his is a ', 'es', '']
Instead of "t", you can write any character you want. If you do not include any character, it means “split on all whitespace”:
teststring = " this has a lot of spaces and tabs"
result = testring.split()
Then result contains:
['this', 'has', 'a', 'lot', 'of', 'spaces', 'and', 'tabs']
Joining strings
You can also relatively easily “join” or “smush” strings together:
listofstrings = ['a', 'b', 'c']
result = "**".join(listofstrings)
Then result will contain the string:
a**b**c
Take a look at the official Python documentation for more information.
Ans.
#列出一字串
w = "there is a pig"
#拆了他
#字串.split("這裡填用以分割的字")可以以括弧中的字分割字串
print(w.split())
#方法1
w = "there is a pig"
A = w.split()
A.reverse()
print(A)
print("------")
#方法2
# Reversing a list
#Syntax: A = w[start:stop:step]
#但我不知道為啥會整個倒過來...
w = "there is a pig"
A = w.split()
A = w[::-1]
print(A)
print("------")
#方法3
w = "there is a pig"
A = w.split()
for B in reversed(A):
print(B)
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