python基础1-字符串
#需要掌握:移除,移除左边,右边#1.strip,lstrip,rstrip
name='....yaoruixue....'
print(name.strip('.'))
print(name.lstrip('.'))
print(name.rstrip('.'))
yaoruixue
yaoruixue....
....yaoruixue
##lower,upper(字符串大小写)
print('YaoRuiXue'.lower())
print('YaoRuiXue'.upper())
yaoruixue
YAORUIXUE
##startswith,endswith 以什么开头结尾
msg='yao rui xue'
print(msg.startswith('yao'))
print(msg.endswith('xue'))
print(msg.startswith('a'))
True
True
False
format的三种玩法,格式化字符串的方式,从python2.6新增的。(官方推荐用的方式,%方式将会在后面的版本被淘汰)
print ('my name is %s my age is %d' %('yao',23))
print('my name is {} my age is {}'.format('yao',23))
my name is yao my age is 23
print('{0} {1} {0}'.format('yao',23)) ##通过位置参数,第一个参数是0,然后1。。
yao 23 yao
print('my name is {name} my age is {age}'.format(age=19,name='yao'))
names={'name':'Kevin','name2':'Tom'}
print 'hello {names}i am {names}'.format(names=names) ##通过字典key
hello Kevini am Tom
#replace替换
msg='hello world my name is yao'
msg=msg.replace('yao','xue',1)
print(msg)
#isdigit判断是否为整形
age=input('>>: ').strip()
if age.isdigit():
age=int(age)
else:
print("必须输入数字")
#了解
#1、find,rfind,index,rindex,count
#2、center,ljust,rjust,zfill
#3、expandtabs
#4、captalize,swapcase,title
#5、is数字系列
#6、is其他
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