python全栈开发基础【第二篇】字符串格式化及字符串的一些方法
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()) |
