*Memo:
- My post explains a tuple (1).
- My post explains a tuple (2).
- My post explains a tuple (3).
- My post explains a tuple (4).
- My post explains a tuple (5).
A tuple cannot be changed by indexing, slicing and a del statement as shown below:
*Memo:
- A
delstatement cannot remove zero or more elements from a tuple by indexing and slicing but can remove one or more variables themselves.
v = ('a', 'b', 'c', 'd', 'e', 'f') v[1] = 'X' v[-5] = 'X' v[3:5] = ['Y', 'Z'] v[-3:-1] = ['Y', 'Z'] v[1], v[3:5] = 'X', ['Y', 'Z'] v[-5], v[-3:-1] = 'X', ['Y', 'Z'] # TypeError: 'tuple' object does not support item assignment v = ('a', 'b', 'c', 'd', 'e', 'f') del v[1], v[3:5] # del v[-5], v[-2:5] # TypeError: 'tuple' object does not support item deletion v = ('a', 'b', 'c', 'd', 'e', 'f') del v print(v) # NameError: name 'v' is not defined If you really want to change a tuple by indexing, slicing and a del statement, use list() and tuple() as shown below:
v = ('a', 'b', 'c', 'd', 'e', 'f') v = list(v) v[1] = 'X' v[-5] = 'X' v[3:5] = ['Y', 'Z'] v[-3:-1] = ['Y', 'Z'] v[1], v[3:5] = 'X', ['Y', 'Z'] v[-5], v[-3:-1] = 'X', ['Y', 'Z'] v = tuple(v) print(v) # ('a', 'X', 'c', 'Y', 'Z', 'f') v = ('a', 'b', 'c', 'd', 'e', 'f') v = list(v) del v[1], v[3:5] # del v[-5], v[-2:5] v = tuple(v) print(v) # ('a', 'c', 'd') A tuple can be continuously used through multiple variables as shown below:
v1 = v2 = v3 = ('A', 'B', 'C', 'D', 'E') # Equivalent # v1 = ('A', 'B', 'C', 'D', 'E') print(v1) # ('A', 'B', 'C', 'D', 'E') # v2 = v1 print(v2) # ('A', 'B', 'C', 'D', 'E') # v3 = v2 print(v3) # ('A', 'B', 'C', 'D', 'E') A tuple cannot be shallow-copied and deep-copied as shown below:
<Shallow & Deep copy>:
*Memo:
-
v1andv2refer to the same outer and inner tuple. -
iscan check ifv1andv2refer to the same outer and inner tuple. - copy.copy(),
tuple()and slicing cannot shallow-copy a tuple. - copy.deepcopy() cannot deep-copy and even shallow-copy a tuple.
import copy v1 = ('A', 'B', ('C', 'D')) v2 = copy.copy(v1) v2 = tuple(v1) v2 = v1[:] v2 = copy.deepcopy(v1) print(v1) # ('A', 'B', ('C', 'D')) print(v2) # ('A', 'B', ('C', 'D')) print(v1 is v2, v1[2] is v2[2]) # True True 
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