python-009基本数据类型常用功能（详解）

Posted 2021-02-19 bigdata-6

 1 基本数据类型常用功能：
 2     数字  int
 3 n1 = 2
 4 n2 = 3
 5 print (n1 + n2)
 6 print (n1.__add__(n2))
 7 
 8 
 9 # 获取二进制的最短位数
10 # i = 4
11 # ret = i.bit_length()
12 # print (ret)
13 
14     字符串 str
15 1.capitalize
16 a1 = ‘alex‘
17 rex = a1.capitalize()
18 print (rex)
19 2.center(self, width, fillchar=None)
20   width：总长度；fillchar：空白处填充内容
21 a1 = ‘alex‘
22 rex = a1.center(20, ‘*‘)
23 print (rex)
24 
25 3.count：查看子序列的个数
26 a1 = ‘alex is fskfdj‘
27 rex = a1.count(‘s‘)
28 print (rex)
29 4.指定范围内，某个值出现的次数
30 a1 = ‘alex is fskfdj‘
31 rex = a1.count(‘f‘,0,12)
32 print (rex)  
33 
34 5.endswith:是否以 ***结束
35 a1 = ‘alex‘
36 rex = a1.endswith(‘x‘)
37 print (rex)
38 6.从0开始，小于2的值
39 a1 = ‘alex‘
40 rex = a1.endswith(‘l‘,0,2)
41 print (rex)
42 
43 7.find：寻找子序列的位置，如果没有找到，返回-1
44 a1 = ‘alex‘
45 rex = a1.find(‘g‘)
46 print (rex)
47 
48 8.format：字符串格式化，动态参数
49 a1 = ‘helle {0} ,age (1)‘
50 print (a1)
51 # {0}，{1} 是占位符
52 new1 = a1.format("alex",19)
53 print (new1)

 

基本数据类型常用功能：数字  intn1 = 2n2 = 3print (n1 + n2)print (n1.__add__(n2))

# 获取二进制的最短位数# i = 4# ret = i.bit_length()# print (ret)
字符串 str1.capitalizea1 = ‘alex‘rex = a1.capitalize()print (rex)2.center(self, width, fillchar=None)  width：总长度；fillchar：空白处填充内容a1 = ‘alex‘rex = a1.center(20, ‘*‘)print (rex)
3.count：查看子序列的个数a1 = ‘alex is fskfdj‘rex = a1.count(‘s‘)print (rex)4.指定范围内，某个值出现的次数a1 = ‘alex is fskfdj‘rex = a1.count(‘f‘,0,12)print (rex)  
5.endswith:是否以 ***结束a1 = ‘alex‘rex = a1.endswith(‘x‘)print (rex)6.从0开始，小于2的值a1 = ‘alex‘rex = a1.endswith(‘l‘,0,2)print (rex)
7.find：寻找子序列的位置，如果没有找到，返回-1a1 = ‘alex‘rex = a1.find(‘g‘)print (rex)
8.format：字符串格式化，动态参数a1 = ‘helle {0} ,age (1)‘print (a1)# {0}，{1} 是占位符new1 = a1.format("alex",19)print (new1)






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