2. String

 1 #!/user/bin/env python
 2 # -*- coding:utf-8 -*-
 3 """
 4 string (scene):
 5     section : [start:end[:step]]
 6         containing "start" and does not contain "end"
 7         string = "1234567"
 8             1   2   3   4   5   6   7
 9             0   1   2   3   4   5   6
10             -7  -6  -5  -4  -3  -2  -1
11             string[:]           result : 1234567
12             string[1:4]         result : 234
13             string[-6:-3]       result : 234
14             string[1:-3]        result : 234
15             string[-6:4]        result : 234
16             string[::3]         result : 147
17             string[::-1]        result : 7654321
18             string[-2::-2]      result : 642
19             string[-3:-6:-1]    result : 543
20             string[4:1:-1]      result : 543
21             string[4:-6:-1]     result : 543
22             string[-3:1:-1]     result : 543
23         string.find() -> int        Return -1 on failure.
24         string.index() -> int       Raises ValueError when the substring is not found.
25         string.replace(old, new, count) -> string
26             count :
27                 Maximum number of occurrences to replace.
28                 -1 (the default value) means replace all occurrences.
29         string.split([sep], [maxSplit]) ->list
30             sep
31                 The delimiter according which to split the string.
32                 None (the default value) means split according to any whitespace,
33                 and discard empty strings from the result.
34             maxSplit
35                 Maximum number of splits to do.
36                 -1 (the default value) means no limit.
37         string.upper()
38         string.lower()
39         string.title()        words start with upper cased characters and all remaining cased characters have lower case.
40         string.capitalize()   make the first character have upper case and the rest lower case.
41 
42         string.isupper()
43         string.islower()
44         string.isalpha()
45         string.isdigit()
46         string.startswith()
47         string.endswith()
48 
49         string.center(width, [fillchar])
50         string.ljust(width, [fillchar])
51         string.rjust(width, [fillchar])
52 
53         string.format()
54             name = "cxk"
55             age = 18
56             print("{}, age : {}, you are an idiot".format(name, age))
57             print("{0}, age : {1}, you are an idiot".format(name, age))
58             print("{}, age : {}, you are an idiot".format(name=name, age=age))
59 
60             money = 5.99458
61             print("I have {:.2f}¥".formate(money))
62 
63         string.strip()
64         string.rstrip()
65         string.lstrip()
66 
67         stirng.join()
68 
69     String-Supported operators :
70         + * in is == != [] % > <
71 
72 """