[Python] 07 - Statements --> Functions

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• 阶级关系

1. Programs are composed of modules.
2. Modules contain statements.
3. Statements contain expressions.
4. Expressions create and process objects.

 

• 教学大纲 

 

 

 

  

 

Statements

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大纲纵览  

Python 3.X’s statements

• Python 3.X reserved words．

 

• 一些简单的示范例子，page 372/1594

 1 a, b = 'good', 'bad'
 2 
 3 log.write("spam, ham")
 4 
 5 print('Then Killer', joke)
 6 
 7 if "python" in text:
 8 　　print(text)
 9 
10 for x in mylist:
11 　　print(x)
12 
13 while X > Y:
14 　　print('hello')
15 
16 while True:
17 　　pass
18 
19 while True:
20 　　if exittest(): break
21 
22 while True:
23 　　if skiptest(): continue
24 
25 def f(a, b, c=1, *d):
26 　　print(a+b+c+d[0])
27 
28 # 其中一个*号代表list或者tuple，**代表map或者dict
29 def f(a, b, c=1, *d):
30 　　return(a+b+c+d[0])
31 
32 def gen(n):
33 　　for i in n:
34 　　　　yield i*2
35 
36 x = 'old'
37 def function():
38 　　global x, y:
39 　　x = 'new'
40 
41 # https://stackoverflow.com/questions/1261875/python-nonlocal-statement
42 def outer():
43 　　x = 'old'
44 　　def function():
45 　　　　nonlocal x:
46 　　　　x = 'new'
47 
48 import sys
49 
50 from sys import stdin
51 
52 class Subclass(Superclass):
53 　　staticData = []
54 　　def method(self):
55 　　　　pass
56 
57 try:
58 　　action()
59 except:
60 　　print('action error')
61 
62 # 需进一步理解
63 raise EndSearch(location)
64 
65 assert X > Y, 'X too small'
66 
67 with open('data') as myfile:
68 　　process(myfile)
69 
70 del data[k]
71 del data[i:j]
72 del obj.attr
73 del variable

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