字符串类型内置方法补充

lstrip&rstrip

s='khffhksfksf'
print(s.lstrip('kn'))
print(s.rstrip('sf'))

hffhksfksf
khffhksfk

lower&upper

print(s.upper())

KHFFHKSFKSF

startswith&edndswith

print(s.startswith('1'))
print(s.startswith('k'))
print(s.startswith('f',2,3))#表示索引2到索引3,当前为f

False
True
True

rsplit

name='halfh:af jd:afl'
print(name.rsplit(':'))
print(name.split(':'))
print(name.split(':',1))
print(name.rsplit(':',1))

['halfh', 'af jd', 'afl']
['halfh', 'af jd', 'afl']
['halfh', 'af jd:afl']
['halfh:af jd', 'afl']

join

name_list=['dhskdbll','ffskf','ffskf','shfk']
print(name_list)
print('sd'.join(name_list))#用sd连接起来

['dhskdbll', 'ffskf', 'ffskf', 'shfk']
dhskdbllsdffskfsdffskfsdshfk

replace

name1='aflffskff4ffskf'
print(name1)
print(name1.replace('afl','dhj'))
print(name1.replace('ffskf','l',1))
print(name1.replace('ffskf','l'))

aflffskff4ffskf
dhjffskff4ffskf
afllf4ffskf
afllf4l

isdigit

print(name.isdigit())
print('140'.isdigit())#判断140是否为只包含数字字符

False
True