数据类型之字符串
2020-02-17 18:19 小仓大神 阅读(141) 评论(0) 编辑 收藏 举报1.%s,%d
举例1:name='egon'
age=20
print("my name is %s my age is %s" %(name,age))#%s既能接受字符串,也能接受数字
print(‘my name is %s my age is %d’ %(name,age))#%d只能接受数字
举例2:用户信息的显示
1 while True: 2 name=input("name:") 3 age=input("age:") 4 sex=input("sex:") 5 height=input("height:") 6 msg=''' 7 ------------%s info----------- 8 name:%s 9 age:%s 10 sex:%s 11 height:%s 12 ------------------------------ 13 '''%(name,name,age,sex,heigth) 14 print(msg)
运行结果如下:
2.字符串方法
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# name='egon' #name=str('egon') # print(type(name)) #优先掌握 #1.移除空白strip # msg=' hello ' # print(msg) # print(msg.strip()) # 移除‘*’ # msg='***hello*********' # msg=msg.strip('*') # print(msg) #移除左边的 # print(msg.lstrip('*')) #移除右边的 # print(msg.rstrip('*')) #用处 while True : name = input ( 'user: ' ).strip() password = input ( 'password: ' ).strip() if name = = 'egon' and password = = '123' : print ( 'login successfull' ) #切分split # info='root:x:0:0::/root:/bin/bash' # print(info[0]+info[1]+info[2]+info[3]) # user_l=info.split(':') # print(user_l[0]) # msg='hello world egon say hahah' # print(msg.split()) #默认以空格作为分隔符 #cmd='download|xhp.mov|3000' # cmd_l=cmd.split('|') # print(cmd_l[1]) # print(cmd_l[0]) # print(cmd.split('|',1)) #用处 while True : cmd = input ( '>>: ' ).strip() if len (cmd) = = 0 : continue cmd_l = cmd.split() print ( '命令是:%s 命令的参数是:%s' % (cmd_l[ 0 ],cmd_l[ 1 ])) #长度len # print(len('hell 123')) #索引 # 切片:切出子字符串 # msg='hello world' # print(msg[1:3]) #1 2 # print(msg[1:4]) #1 2 3 # 掌握部分 oldboy_age = 84 while True : age = input ( '>>: ' ).strip() if len (age) = = 0 : continue if age.isdigit(): age = int (age) else : print ( 'must be int' ) #startswith,endswith # name='alex_SB' # print(name.endswith('SB')) # print(name.startswith('alex')) #replace # name='alex say :i have one tesla,my name is alex' # print(name.replace('alex','SB',1)) # print('my name is %s my age is %s my sex is %s' %('egon',18,'male')) # print('my name is {} my age is {} my sex is {}'.format('egon',18,'male')) # print('my name is {0} my age is {1} my sex is {0}: { 2 } '.format(' egon ',18,' male')) # print('my name is {name} my age is {age} my sex is {sex}'.format( # sex='male', # age=18, # name='egon')) # name='goee say hello' # # print(name.find('S',1,3)) #顾头不顾尾,找不到则返回-1不会报错,找到了则显示索引 # # print(name.index('S')) #同上,但是找不到会报错 # # print(name.count('S',1,5)) #顾头不顾尾,如果不指定范围则查找所有 #join # info='root:x:0:0::/root:/bin/bash' # print(info.split(':')) # l=['root', 'x', '0', '0', '', '/root', '/bin/bash'] # print(':'.join(l)) #lower,upper # name='eGon' # print(name.lower()) # print(name.upper()) #了解部分 #expandtabs # name='egon\thello' # print(name) # print(name.expandtabs(1)) #center,ljust,rjust,zfill # name='egon' # # print(name.center(30,'-')) # print(name.ljust(30,'*')) # print(name.rjust(30,'*')) # print(name.zfill(50)) #用0填充 #captalize,swapcase,title # name='eGon' # print(name.capitalize()) #首字母大写,其余部分小写 # print(name.swapcase()) #大小写翻转 # msg='egon say hi' # print(msg.title()) #每个单词的首字母大写 #在python3中 num0 = '4' num1 = b '4' #bytes num2 = u '4' #unicode,python3中无需加u就是unicode num3 = '四' #中文数字 num4 = 'Ⅳ' #罗马数字 #isdigt:str,bytes,unicode # print(num0.isdigit()) # print(num1.isdigit()) # print(num2.isdigit()) # print(num3.isdigit()) # print(num4.isdigit()) #isdecimal:str,unicode # num0='4' # num1=b'4' #bytes # num2=u'4' #unicode,python3中无需加u就是unicode # num3='四' #中文数字 # num4='Ⅳ' #罗马数字 # print(num0.isdecimal()) # # print(num1.) # print(num2.isdecimal()) # print(num3.isdecimal()) # print(num4.isdecimal()) #isnumeric:str,unicode,中文,罗马 # num0='4' # num1=b'4' #bytes # num2=u'4' #unicode,python3中无需加u就是unicode # num3='四' #中文数字 # num4='Ⅳ' #罗马数字 # # print(num0.isnumeric()) # # print(num1) # print(num2.isnumeric()) # print(num3.isnumeric()) # print(num4.isnumeric()) #is其他 # name='egon123' # print(name.isalnum()) #字符串由字母和数字组成 # name='asdfasdfa sdf' # print(name.isalpha()) #字符串只由字母组成 # # name='asdfor123' # print(name.isidentifier()) name = 'egGon' print (name.islower()) # print(name.isupper()) # print(name.isspace()) name = 'Egon say' print (name.istitle()) |