字符串格式化及字符串的一些方法
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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=84while 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\' #bytesnum2=u\'4\' #unicode,python3中无需加u就是unicodenum3=\'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()) |
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