逻辑运算：
成员运算：
另外：Python的字符串与字符串不同：
# 字符串可进行加，乘（乘必须是与整数相乘）# 不可进行减，除a = "abd"b = "abc"print(a + b)print(a * 10)
字符串
"hello world"
字符串常用功能：
- 移除空白
- 分割
- 长度
- 索引
- 切片
列表
创建列表：
| 1 2 3 | name_list = [ 'alex' , 'seven' , 'eric' ] 或 name_list ＝ list ([ 'alex' , 'seven' , 'eric' ]) |
基本操作：
- 索引
- 切片
- 追加
- 删除
- 长度
- 循环
- 包含
元祖
创建元祖：
| 1 2 3 | ages = ( 11 , 22 , 33 , 44 , 55 ) 或 ages = tuple (( 11 , 22 , 33 , 44 , 55 )) |
基本操作：
- 索引
- 切片
- 循环
- 长度
- 包含
字典（无序）
创建字典：
| 1 2 3 | person = { "name" : "mr.wu" , 'age' : 18 } 或 person = dict ({ "name" : "mr.wu" , 'age' : 18 }) |
常用操作：
- 索引
- 新增
- 删除
- 键、值、键值对
- 循环
- 长度
PS：循环，range，continue 和 break
Python3里一个数不管多大都是int型
Python2里分int和long型，具有范围
必须记得方法：.join .split .find strip upper lower .replace
# !/usr/bin/env python# -*- encoding:UTF-8 -*-name="王团结"if "团结" in name: print('OK')else: print("Error")name="王团结"if "王" not in name: print("1")else: print("2")a = 123v = a.bit_length()print(v)# 强制转换a = "123"print(type(a), a)b = int(a)print(type(b), b)#将字符串转化为数字以base进制转换num = "a"v = int(num, base=16)print(v)# bit_length()表示数字的二进制的位数age = 10r = age.bit_length()print(r)test = "aLexaLjfklasjfl"# 首字母大写v = test.capitalize()print(v)# 所有变小写，casefold更牛逼，很多未知的对相应变小写v1 = test.casefold()print(v1)# 针对英文v2 = test.lower()print(v2)# 设置宽度，并将内容居中# 20 代指总长度# * 空白未知填充，一个字符，可有可无v3 = test.center(20)print(v3)v4 = test.center(20, "*")print(v4)test = "alex"v = test.ljust(20, "*")print(v)test = "alex"v = test.rjust(20, "*")print(v)v = test.zfill(20) #不太好print(v)# 去字符串中寻找，寻找子序列的出现次数count = test.count('aL')print(count)count = test.count('aL', 4)print(count)count = test.count('aL', 5, 6)print(count)# 以什么结尾# 以什么开头v = test.endswith('ex')v1=test.startswith('ex')print(v)print(v1)#e xpandtabs,先断句（6，20）test = "123456\t78\t9"v = test.expandtabs(6)print(v, len(v))test1 = "username\temail\tpassword\nlaying\tying@q.com\t123\nlaying\tying@q.com\t123\nlaying\tying@q.com\t123\n"v = test1.expandtabs(20)print(v)# 从开始往后找，找到第一个之后，获取位置# 左闭右开# > 或 >=# 字符串的第一个索引为0v = test.find('ex')print(v)v = test.find('ex', 3, 8)print(v)#index找不到，报错，忽略test= "alexalex"v= test.index('fdja')print(v)# 格式化，将一个字符串中的占位符（{}）替换为指定的值test = 'i am {name},age {a}'print(test)v = test.format(name='alex', a=19)print(v)# 根据顺序指定对应关系（从0开始）test = 'i am {1},age {0}'print(test)v = test.format('alex', 19)print(v)#格式化，传入的值（字典）{"name":'alex', "a": 19}test = 'i am {name},age {a}'v1 = test.format(name='alex', a=19)v2 = test.format_map({ "name": 'alex', "a": 19})print(v1)print(v2)print(v1==v2)#字符串中是否只包含 字母和数字test="lkfasj123"v= test.isalnum()print(v)#是否是字母，汉字test = "asdf"v = test.isalpha()print(v)# 当前输入是否是数字test = "123②"v1 = test.isdecimal() # 十进制v2 = test.isdigit() # 特殊的符号，不支持中文v3 = test.isnumeric() # 更nb，支持中文print(v1, v2, v3)test = "123"v1 = test.isdecimal()v2 = test.isdigit()v3 = test.isnumeric()print(v1, v2, v3)test = "123②二"v1 = test.isdecimal()v2 = test.isdigit()v3 = test.isnumeric()print(v1, v2, v3)# 大小写转换test = "aBLex"v = test.swapcase()print(v)# 字母，数字，下划线：标识符 def classa = "def"v = a.isidentifier()print(v)# 是否存在不可显示的字符,能否打印字符# \t 制表符# \n 换行符test = "oiuas\tfjdlsa"v = test.isprintable()print(v)#判断是否全部是空格test = "fsd a"v = test.isspace()print(v)# 判断是否是标题，以及变成标题test = "Return True if the string is a title-cased string, False otherwise."v = test.istitle()print(v)test = test.title()v = test.istitle()print(v)# *****将字符串中的每一个元素按照指定分隔符进行拼接test = "你是风儿我是沙"print(test)t = '_'v = t.join(test)print(v)# 判断是否全部是大小写 和 转换大小写test = "Alex"v1 = test.islower()v2 = test.lower()print(v1, v2)v1 = test.isupper()v2 = test.upper()print(v1, v2)# 去除空格 \n \ttest = " alex "v1 = test.lstrip()v2 = test.rstrip()v3 = test.strip()print(v1)print(v2)print(v3)# 指定参数删除test = "xalex"v1 = test.lstrip('x')v2 = test.rstrip('x')v3 = test.strip('x')print("\n")print(v1)print(v2)print(v3)# 移除指定字符串# 有限最多匹配test = "xalex"v1 = test.lstrip('xa')v2 = test.rstrip('9lexxexa')v3 = test.strip('xa')print(v1)print(v2)print(v3)# 替换（前提要有对应关系）v = "aisfjdslkj;jdflsakjfl;fdjsal;fj"m = str.maketrans("aeiou", "12345")new_v = v.translate(m)print(new_v)# 分隔，只有一个参数，且能拿到所有字符test = "testfhdsajkhflkds"v1 = test.partition('s')v2 = test.rpartition('s')print(v1)print(v2)# 弊端自己处理的字符拿不到v3 = test.split('s')v33 = test.split('s', 1)v4 = test.rsplit('s')print(v3)print(v33)print(v4)# 分割，只能根据，true，false:是否保留换行test = "jaskldf\njflsdka;dfj\nfjdslajf;"v = test.splitlines(True)print(v)v = test.splitlines(False)print(v)# 以XX开头，结尾test = "backend 1.1.1.1"v1 = test.startswith('a')v2 = test.endswith('a')print(v1, v2)test = "alexafjdslalexalex"v = test.replace('ex', 'bbb')print(v)v = test.replace('ex', 'bbb',1)print(v)v = test.replace('ex', 'bbb',2)print(v) 字符串进阶
注意：len（） for循环 索引 切片 基本都能用（字符串，列表等）
!/usr/bin/env python-*- encoding:UTF-8 -*-# 索引，下标，获取字符test = "alex"v = test[0]print(v)# 左闭右开 切片test = "alex"v = test[0:3]print(v)# 获取长度# 汉字在python2和3有区别test = "alex"v = len(test)print(v)# 注意len("asdf")'_'.join("asdfs") 字符串一旦创建就不可修改和java一样