???0?????????python??????003??????

Posted 2021-02-14

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?????????col ?????? tags ????????? ?????? ?????? abc enc code

sequence ??????

?????????????????????????????????????????????????????????????????????????????????python??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????

???????????????????????????????????????????????????????????????????????????????????????

???????????????

tuple??????????????? ???????????????????????? ??? list (???)???

a1 = (1,2,3,4,???5???,True)

a2 = [6,???7???,False]

print(a1,type(a1))

print(a2,type(a2))

tuple()???list[]???????????????????????????????????????tuple????????????????????????????????????list?????????????????????????????????

??????????????????????????????????????????????????????????????????????????????????????????????????????

a1 = (1,2,3,4,???5???,True)

a2 = [6,???7???,False]

print(a1,type(a1))

print(a2,type(a2))


#??????????????????????????????????????????
a3 = [1,[2,3]]

#?????????
a4 = []

print(a3,type(a3))

print(a4)

?????????????????????

????????????????????????????????????????????????????????????0???????????????????????????

a1 = (1,2,3,4,???5???,True)

a2 = [6,???7???,False]

print(a1,type(a1))

print(a2,type(a2))


#??????????????????????????????????????????
a3 = [1,[2,3]]

#?????????
a4 = []

print(a3,type(a3))

print(a4)


print(???============?????????=============???)

print(?????????[??????]???)

print(a1[0])

print(a3[1])

#???????????????

a2[0] = 9

print(a2)

#?????????tuple??????????????????????????????
a1[0] = 9

print (a1)

??????????????????

??????????????? ????????????[??????:??????:??????]

print(a1[:5]) # ??????????????????4 ?????????5????????? ??????????????????

print(a1[2:]) # ?????????2?????????

print(a1[0:5:2]) # ?????????0?????????4 (??????5???????????????)?????????2??????????????? ????????????0???2???4????????????

print(a1[2:0:-1]) # ?????????2?????????1

??????????????????????????????????????????????????????????????????????????????????????????????????????????????????

??????????????????

print(a1[-1]) # ????????????????????????

print(a1[-3]) # ???????????????????????????

???????????????a1[0:-1], ??????????????????????????????????????? ?????????????????????????????????????????????

???????????????????????????????????????????????????

Python 3.7.2 (tags/v3.7.2:9a3ffc0492, Dec 23 2018, 23:09:28) [MSC v.1916 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license()" for more information.
>>> print(1)
1
>>> 
==================== RESTART: E:/python/studyPython004.py ====================
5
>>> 
==================== RESTART: E:/python/studyPython004.py ====================
(1, 2, 3, 4, ???5???, True) <class ???tuple???>
[6, ???7???, False] <class ???list???>
>>> 
==================== RESTART: E:/python/studyPython004.py ====================
(1, 2, 3, 4, ???5???, True) <class ???tuple???>
[6, ???7???, False] <class ???list???>
[1, [2, 3]] <class ???list???>
[]
>>> 
==================== RESTART: E:/python/studyPython004.py ====================
(1, 2, 3, 4, ???5???, True) <class ???tuple???>
[6, ???7???, False] <class ???list???>
[1, [2, 3]] <class ???list???>
[]
============?????????=============
1
[2, 3]
Traceback (most recent call last):
  File "E:/python/studyPython004.py", line 29, in <module>
    a1[0] = 9
TypeError: ???tuple??? object does not support item assignment
>>> 
==================== RESTART: E:/python/studyPython004.py ====================
(1, 2, 3, 4, ???5???, True) <class ???tuple???>
[6, ???7???, False] <class ???list???>
[1, [2, 3]] <class ???list???>
[]
============?????????=============
??????[??????]
1
[2, 3]
[9, ???7???, False]
Traceback (most recent call last):
  File "E:/python/studyPython004.py", line 36, in <module>
    a1[0] = 9
TypeError: ???tuple??? object does not support item assignment
>>> 
==================== RESTART: E:/python/studyPython004.py ====================
(1, 2, 3, 4, ???5???, True) <class ???tuple???>
[6, ???7???, False] <class ???list???>
[1, [2, 3]] <class ???list???>
[]
============?????????=============
??????[??????]
1
[2, 3]
[9, ???7???, False]
3
>>>

????????????tuple

??????????????????????????????????????????????????????????????????????????????

str = ???abcdef???

print(str[2:4])

???????????????????????????????????????

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