Python學習筆記 字串練習及可變字串

python內字串不允許修改，要修改用可變字串

可變字串練習

import io

s='hello,mike'
sio=io.stringio(s)
a=sio.getvalue(
)sio.seek(6)
#改變游標地方
sio.write(
'f')
sio.getvalue(
)print
(sio.getvalue(
))

hello,fike

import time

a='to be not to be'
print
(a.startswith(
'to'))
print
(a.endswith(
'be'))
print
(a.find(
't')
)print
(a.rfind(
't')
)print
(a.count(
't')
)print
(a.isalnum())
print
(a.strip(
't')
)print
(a.lstrip(
't')
)print
(a.rstrip(
'e')
)b=a.split(
'be'
)print
(b)c=
'*a*'
.join(b)
print
(c)d=a.capitalize(
)print
(d)e=a.title(
)print
(e)f=a.upper(
)print
(f)g=a.lower(
)print
(g)k=a.swapcase(
)print
(k)time01=time.time()h=
''for i in
range
(1000000):
h+='sxit'
time02=time.time(
)print
('運算時間'
+str
(time02-time01)
)time03=time.time(
)li=
for i in
range
(1000000):
'sxit')h=
''.join(li)
time04=time.time(
)print
('運算時間'
+str
(time04-time03)
)

true

true010
3false
o be not to be
o be not to be
to be not to b
['to '
,' not to ',''
]to *a*
not to *a*
to be not to be
to be not to be
to be not to be
to be not to be
to be not to be
運算時間0.9697716236114502
運算時間0.14424657821655273

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