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Geoff Liu
2014-11-05 12:36:28 -07:00
parent ce381ce958
commit 191a0c7050
1 changed files with 16 additions and 19 deletions
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@@ -345,9 +345,9 @@ while x < 4:
print(x) print(x)
x += 1 # x = x + 1 的简写 x += 1 # x = x + 1 的简写
# try/except块处理异常状况 # 用try/except块处理异常状况
try: try:
# 用raise来抛出异常 # 用raise抛出异常
raise IndexError("This is an index error") raise IndexError("This is an index error")
except IndexError as e: except IndexError as e:
pass # pass是无操作，但是应该在这里处理错误 pass # pass是无操作，但是应该在这里处理错误
@@ -564,31 +564,28 @@ dir(math)
## 7. 高级用法 ## 7. 高级用法
#################################################### ####################################################
# Generators help you make lazy code # 用生成器(generators)方便地写惰性运算
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. # 生成器只有在需要时才计算下一个值。它们每一次循环只生成一个值，而不是把所有的
# Instead of generating and returning all values at once it creates one in each # 值全部算好。这意味着double_numbers不会生成大于15的数字。
# iteration. This means values bigger than 15 wont be processed in #
# double_numbers. # range的返回值也是一个生成器，不然一个1到900000000的列表会花很多时间和内存。
# Note range is a generator too. Creating a list 1-900000000 would take lot of #
# time to be made # 如果你想用一个Python的关键字当作变量名，可以加一个下划线来区分。
# We use a trailing underscore in variable names when we want to use a name that
# would normally collide with a python keyword
range_ = range(1, 900000000) range_ = range(1, 900000000)
# will double all numbers until a result >=30 found # 当找到一个 >=30 的结果就会停
for i in double_numbers(range_): for i in double_numbers(range_):
print(i) print(i)
if i >= 30: if i >= 30:
break break
# Decorators # 装饰器(decorators)
# in this example beg wraps say # 这个例子中，beg装饰say
# Beg will call say. If say_please is True then it will change the returned # beg会先调用say。如果返回的say_please为真，beg会改变返回的字符串。
# message
from functools import wraps from functools import wraps
@@ -613,9 +610,9 @@ 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? ## 想继续学吗？
### Free Online ### 线上免费材料（英文）
* [Learn Python The Hard Way](http://learnpythonthehardway.org/book/) * [Learn Python The Hard Way](http://learnpythonthehardway.org/book/)
* [Dive Into Python](http://www.diveintopython.net/) * [Dive Into Python](http://www.diveintopython.net/)
@@ -626,7 +623,7 @@ print(say(say_please=True)) # Can you buy me a beer? Please! I am poor :(
* [Python Module of the Week](http://pymotw.com/3/) * [Python Module of the Week](http://pymotw.com/3/)
* [A Crash Course in Python for Scientists](http://nbviewer.ipython.org/5920182) * [A Crash Course in Python for Scientists](http://nbviewer.ipython.org/5920182)
### Dead Tree ### 书籍（也是英文）
* [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)