《笨辦法學python》加分習題39 我的答案

這是我自己學習的答案，會盡力寫的比較好。還望大家能夠提出我的不足和錯誤，謝謝！

print

"wait there's not 10 things in that list, let's fix that."

stuff = ten_things.split(' ')

more_stuff = ["day", "night", "song", "frisbee", "corn", "banana", "girl", "boy"]

while len(stuff) != 10:

next_one = more_stuff.pop()

print

"adding: ", next_one

print

"there's %d items now." % len(stuff)

print

"there we go: ", stuff

print

"let's do some things with stuff."

print stuff[1]

print stuff[-1] # whoa! fancy

print stuff.pop()

print

' '.join(stuff) # what? cool!

print

'#'.join(stuff[3:5]) # super stellar!

1、

stuff = ten_things.split(' ') # split('', ten_things)

next_one = more_stuff.pop() # pop(more_stuff)
print stuff.pop() # pop(stuff)
print
' '.join(stuff) # what? cool! join(stuff, ' ')
print
'#'.join(stuff[3:5]) # super stellar! join(stuff[3:5], '#')

# 用『 』拆開ten_things;為『 』和ten_things呼叫了split函式

stuff = ten_things.split(' ') # split('', ten_things)
# 提取出more_stuff中-1位元素並列印出來；為more_stuff[-1]位呼叫pop函式
next_one = more_stuff.pop() # pop(-1，more_stuff)
# 類似如上pop()
print stuff.pop() # pop(-1，stuff)
#如習題答案
print
' '.join(stuff) # what? cool! join(stuff, ' ')
#類似習題答案
print
'#'.join(stuff[3:5]) # super stellar! join(stuff[3:5], '#')

5、dir(something)中，dir()在pydoc的解釋如下：

help on built-in function dir in modulebuiltin:

dir(…)

dir([object]) -> list of strings

if called without an argument, return the names in the current scope.

else, return an alphabetized list of names comprising (some of) the attributes
of the given object, and of attributes reachable from it.
if the object supplies a method named __dir__, it will be used; otherwise
the default dir() logic is used and returns:
for a module object: the module's attributes.
for a class object:  its attributes, and recursively the attributes
of its bases.
for any other object: its attributes, its class's attributes, and
recursively the attributes of its class's base classes.

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