*Memo:
- My post explains a list and tuple comprehension.
- My post explains a generator comprehension.
- My post explains a set and the set with copy.
- My post explains a dictionary (1).
<Set Comprehension>:
1D set:
sample = {0, 1, 2, 3, 4, 5, 6, 7} A = {x**2 for x in sample} print(A) # {0, 1, 4, 36, 9, 16, 49, 25} The below is without a set comprehension:
sample = {0, 1, 2, 3, 4, 5, 6, 7} A = set() for x in sample: A.add(x**2) print(A) # {0, 1, 4, 36, 9, 16, 49, 25} 2D set:
sample = {frozenset({0, 1, 2, 3}), frozenset({4, 5, 6, 7})} A = {frozenset(y**2 for y in x) for x in sample} print(A) # {frozenset({16, 25, 36, 49}), frozenset({0, 1, 4, 9})} The below is without a set comprehension:
sample = {frozenset({0, 1, 2, 3}), frozenset({4, 5, 6, 7})} A = set() for x in sample: def func(x): for y in x: yield y**2 A.add(frozenset(func(x))) print(A) # {frozenset({16, 25, 36, 49}), frozenset({0, 1, 4, 9})} 3D set:
sample = {frozenset({frozenset({0, 1}), frozenset({2, 3})}), frozenset({frozenset({4, 5}), frozenset({6, 7})})} A = {frozenset(frozenset(z**2 for z in y) for y in x) for x in sample} print(A) # {frozenset({frozenset({16, 25}), frozenset({49, 36})}), # frozenset({frozenset({9, 4}), frozenset({0, 1})})} The below is without a set comprehension:
sample = {frozenset({frozenset({0, 1}), frozenset({2, 3})}), frozenset({frozenset({4, 5}), frozenset({6, 7})})} A = set() for x in sample: def func(x): for z, y in x: yield frozenset({z**2, y**2}) A.add(frozenset(func(x))) print(A) # {frozenset({frozenset({16, 25}), frozenset({49, 36})}), # frozenset({frozenset({9, 4}), frozenset({0, 1})})} <Dictionary(Dict) Comprehension>:
*Memo:
- A key can have a tuple but not a dictionary, list and set.
1D dictionary:
sample = [0, 1, 2, 3, 4, 5, 6, 7] v = {x:x**2 for x in sample} print(v) # {0: 0, 1: 1, 2: 4, 3: 9, 4: 16, 5: 25, 6: 36, 7: 49} The below is without a dictionary comprehension:
sample = [0, 1, 2, 3, 4, 5, 6, 7] v = {} for x in sample: v.update({x:x**2}) print(v) # {0: 0, 1: 1, 2: 4, 3: 9, 4: 16, 5: 25, 6: 36, 7: 49} 2D dictionary:
sample = ((0, 1, 2, 3), (4, 5, 6, 7)) v = {x: {y:y**2 for y in x} for x in sample} print(v) # {(0, 1, 2, 3): {0: 0, 1: 1, 2: 4, 3: 9}, # (4, 5, 6, 7): {4: 16, 5: 25, 6: 36, 7: 49}} The below is without a dictionary comprehension:
sample = ((0, 1, 2, 3), (4, 5, 6, 7)) v = {} for x in sample: v.update({x:{}}) for y in x: v[x].update({y:y**2}) print(v) # {(0, 1, 2, 3): {0: 0, 1: 1, 2: 4, 3: 9}, # (4, 5, 6, 7): {4: 16, 5: 25, 6: 36, 7: 49}} 3D dictionary:
sample = (((0, 1), (2, 3)), ((4, 5), (6, 7))) v = {x: {y: {z:z**2 for z in y} for y in x} for x in sample} print(v) # {((0, 1), (2, 3)): {(0, 1): {0: 0, 1: 1}, (2, 3): {2: 4, 3: 9}}, # ((4, 5), (6, 7)): {(4, 5): {4: 16, 5: 25}, (6, 7): {6: 36, 7: 49}}} The below is without a dictionary comprehension:
sample = (((0, 1), (2, 3)), ((4, 5), (6, 7))) v = {} for x in sample: v.update({x:{}}) for y in x: v[x].update({y:{}}) for z in y: v[x][y].update({z:z**2}) print(v) # {((0, 1), (2, 3)): {(0, 1): {0: 0, 1: 1}, (2, 3): {2: 4, 3: 9}}, # ((4, 5), (6, 7)): {(4, 5): {4: 16, 5: 25}, (6, 7): {6: 36, 7: 49}}} 
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