*Memo:
- My post explains a tuple (1).
- My post explains a tuple (2).
- My post explains a tuple (3).
- My post explains a tuple (5).
- My post explains a tuple (6).
tuple() can create a tuple with or without an iterable as shown below:
*Memo:
- The 1st argument is
iterable(Optional-Default:()-Type:Iterable):- Don't use
iterable=.
- Don't use
# Empty tuple print(tuple()) print(tuple(())) # () print(tuple([0, 1, 2, 3, 4])) # list print(tuple((0, 1, 2, 3, 4))) # tuple print(tuple({0, 1, 2, 3, 4})) # set print(tuple(frozenset([0, 1, 2, 3, 4]) )) # frozenset print(tuple(iter([0, 1, 2, 3, 4]))) # iterator print(tuple(range(5))) # range # (0, 1, 2, 3, 4) print(tuple({'name': 'John', 'age': 36})) # dict print(tuple({'name': 'John', 'age': 36}.keys())) # dict.keys() # ('name', 'age') print(tuple({'name': 'John', 'age': 36}.values())) # dict.values() # ('John', 36) print(tuple({'name': 'John', 'age': 36}.items())) # dict.items() # (('name', 'John'), ('age', 36)) print(tuple('Hello')) # str # ('H', 'e', 'l', 'l', 'o') print(tuple(b'Hello')) # bytes print(tuple(bytearray(b'Hello'))) # bytearray # (72, 101, 108, 108, 111) A tuple comprehension can create a tuple as shown below:
<1D tuple>:
sample = (0, 1, 2, 3, 4, 5, 6, 7) v = tuple(x**2 for x in sample) print(v) # (0, 1, 4, 9, 16, 25, 36, 49) <2D tuple>:
sample = ((0, 1, 2, 3), (4, 5, 6, 7)) v = tuple(tuple(y**2 for y in x) for x in sample) print(v) # ((0, 1, 4, 9), (16, 25, 36, 49)) <3D tuple>:
sample = (((0, 1), (2, 3)), ((4, 5), (6, 7))) v = tuple(tuple(tuple(z**2 for z in y) for y in x) for x in sample) print(v) # (((0, 1), (4, 9)), ((16, 25), (36, 49))) Be careful, a big tuple gets MemoryError as shown below:
v = (0, 1, 2, 3, 4) * 1000000000 # MemoryError v = range(100000000) print(tuple(v)) # MemoryError v = tuple(x for x in range(1000000000)) # MemoryError A tuple can be read by indexing as shown below:
*Memo:
- Indexing can be done with one or more
[index]in the range[The 1st index, The last index]:-
index(Required-Type:int):- Don't use
index=.
- Don't use
-
indexcan be signed indices(zero and positive and negative indices). - Error occurs if
indexis out of range. -
[slice][index]can be used.
-
<1D tuple>:
v = ('A', 'B', 'C', 'D', 'E', 'F', 'G', 'H') v = 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H' print(v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7]) print(v[-8], v[-7], v[-6], v[-5], v[-4], v[-3], v[-2], v[-1]) print(v[0:1][0], v[1:2][0], v[2:3][0], v[3:4][0], v[4:5][0], v[5:6][0], v[6:7][0], v[7:8][0]) print(v[-8:-7][0], v[-7:-6][0], v[-6:-5][0], v[-5:-4][0], v[-4:-3][0], v[-3:-2][0], v[-2:-1][0], v[-1:8][0]) # A B C D E F G H v = ('A', 'B', 'C', 'D', 'E', 'F', 'G', 'H') print(v[-9], v[8]) # IndexError: tuple index out of range <2D tuple>:
v = (('A', 'B', 'C', 'D'), ('E', 'F', 'G', 'H')) print(v[0], v[1]) print(v[-2], v[-1]) print(v[0:1][0], v[1:2][0]) print(v[-2:-1][-1], v[-1:2][-1]) # ('A', 'B', 'C', 'D') ('E', 'F', 'G', 'H') print(v[0][0], v[0][1], v[0][2], v[0][3], v[1][0], v[1][1], v[1][2], v[1][3]) print(v[-2][-4], v[-2][-3], v[-2][-2], v[-2][-1], v[-1][-4], v[-1][-3], v[-1][-2], v[-1][-1]) print(v[0:1][0][0], v[0:1][0][1], v[0:1][0][2], v[0:1][0][3], v[1:2][0][0], v[1:2][0][1], v[1:2][0][2], v[1:2][0][3]) print(v[-2:-1][-1][-4], v[-2:-1][-1][-3], v[-2:-1][-1][-2], v[-2:-1][-1][-1], v[-1:2][-1][-4], v[-1:2][-1][-3], v[-1:2][-1][-2], v[-1:2][-1][-1]) # A B C D E F G H <3D tuple>:
v = ((('A', 'B'), ('C', 'D')), (('E', 'F'), ('G', 'H'))) print(v[0], v[1]) print(v[-2], v[-1]) print(v[0:1][0], v[1:2][0]) print(v[-2:-1][0], v[-1:2][0]) # (('A', 'B'), ('C', 'D')) (('E', 'F'), ('G', 'H')) print(v[0][0], v[0][1], v[1][0], v[1][1]) print(v[-2][-2], v[-2][-1], v[-1][-2], v[-1][-1]) print(v[0:1][0][0], v[0:1][0][1], v[1:2][0][0], v[1:2][0][1]) print(v[-2:-1][-1][-2], v[-2:-1][-1][-1], v[-1:2][-1][-2], v[-1:2][-1][-1]) # ('A', 'B') ('C', 'D') ('E', 'F') ('G', 'H') print(v[0][0][0], v[0][0][1], v[0][1][0], v[0][1][1], v[1][0][0], v[1][0][1], v[1][1][0], v[1][1][1]) print(v[-2][-2][-2], v[-2][-2][-1], v[-2][-1][-2], v[-2][-1][-1], v[-1][-2][-2], v[-1][-2][-1], v[-1][-1][-2], v[-1][-1][-1]) print(v[0:1][0][0][0], v[0:1][0][0][1], v[0:1][0][1][0], v[0:1][0][1][1], v[1:2][0][0][0], v[1:2][0][0][1], v[1:2][0][1][0], v[1:2][0][1][1]) print(v[-2:-1][-1][-2][-2], v[-2:-1][-1][-2][-1], v[-2:-1][-1][-1][-2], v[-2:-1][-1][-1][-1], v[-1:2][-1][-2][-2], v[-1:2][-1][-2][-1], v[-1:2][-1][-1][-2], v[-1:2][-1][-1][-1]) # A B C D E F G H 
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