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Finish Sec. 7 translation.

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@ -663,34 +663,30 @@ dir(math)
## 7. 進階 ## 7. 進階
#################################################### ####################################################
# Generators help you make lazy code # 產生器(Generator)可以讓你寫更懶惰的程式碼
def double_numbers(iterable): def double_numbers(iterable):
for i in iterable: for i in iterable:
yield i + i yield i + i
# A generator creates values on the fly. # 產生器可以讓你即時的產生值
# Instead of generating and returning all values at once it creates one in each # 不是全部產生完之後再一次回傳，產生器會在每一個遞迴時
# iteration. This means values bigger than 15 wont be processed in # 產生值。 這也意味著大於15的值不會在double_numbers中產生。
# double_numbers. # 這邊，xrange()做的事情和range()一樣
# Note xrange is a generator that does the same thing range does. # 建立一個 1-900000000 的List會消耗很多時間和記憶體空間
# Creating a list 1-900000000 would take lot of time and space to be made. # xrange() 建立一個產生器物件，而不是如range()建立整個List
# xrange creates an xrange generator object instead of creating the entire list # 我們用底線來避免可能和python的關鍵字重複的名稱
# like range does.
# We use a trailing underscore in variable names when we want to use a name that
# would normally collide with a python keyword
xrange_ = xrange(1, 900000000) xrange_ = xrange(1, 900000000)
# will double all numbers until a result >=30 found # 下面的程式碼會把所有的值乘以兩倍，直到出現大於30的值
for i in double_numbers(xrange_): for i in double_numbers(xrange_):
print i print i
if i >= 30: if i >= 30:
break break
# Decorators # 裝飾子
# in this example beg wraps say # 在這個範例中，beg會綁在say上
# Beg will call say. If say_please is True then it will change the returned # Beg會呼叫say。 如果say_please為True的話，它會更改回傳的訊息
# message
from functools import wraps from functools import wraps
@ -715,9 +711,9 @@ print say() # Can you buy me a beer?
print say(say_please=True) # Can you buy me a beer? Please! I am poor :( print say(say_please=True) # Can you buy me a beer? Please! I am poor :(
``` ```
## Ready For More? ## 準備好學更多了嗎?
### Free Online ### 線上免費資源
* [Automate the Boring Stuff with Python](https://automatetheboringstuff.com) * [Automate the Boring Stuff with Python](https://automatetheboringstuff.com)
* [Learn Python The Hard Way](http://learnpythonthehardway.org/book/) * [Learn Python The Hard Way](http://learnpythonthehardway.org/book/)
@ -728,7 +724,7 @@ print say(say_please=True) # Can you buy me a beer? Please! I am poor :(
* [A Crash Course in Python for Scientists](http://nbviewer.ipython.org/5920182) * [A Crash Course in Python for Scientists](http://nbviewer.ipython.org/5920182)
* [First Steps With Python](https://realpython.com/learn/python-first-steps/) * [First Steps With Python](https://realpython.com/learn/python-first-steps/)
### Dead Tree ### 或買本書?
* [Programming Python](http://www.amazon.com/gp/product/0596158106/ref=as_li_qf_sp_asin_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=0596158106&linkCode=as2&tag=homebits04-20) * [Programming Python](http://www.amazon.com/gp/product/0596158106/ref=as_li_qf_sp_asin_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=0596158106&linkCode=as2&tag=homebits04-20)
* [Dive Into Python](http://www.amazon.com/gp/product/1441413022/ref=as_li_tf_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=1441413022&linkCode=as2&tag=homebits04-20) * [Dive Into Python](http://www.amazon.com/gp/product/1441413022/ref=as_li_tf_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=1441413022&linkCode=as2&tag=homebits04-20)