Data Structure interception

>>> list(range(1,6))

[1, 2, 3, 4, 5]

>>> [x for x in range(1,6)]

[1, 2, 3, 4, 5]

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>>> [x for x in range(1,6,2)]

[1, 3, 5]

>>> list(range(1,6,2))

[1, 3, 5]

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a = "abc"

b = "bcde"

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set(a)

{'c', 'a', 'b'}

set(b)

{'c', 'd', 'e', 'b'}

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set(a) & set(b) # & 取共有值

{'c', 'b'}

等同于 a.intersection(b)

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set(a) | set(b) # | 取全部值

{'a', 'e', 'c', 'd', 'b'}

等同于 a.union(b)

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set(a) - set(b) # | 取 a 中 b 没有的值

{'a'}

等同于 a.difference(b)

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set(a) ^ set(b) # | 取非共有值

{'a', 'e', 'd'}

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ord("a") # function ord convert letter to ASCII number, reverse chr

97

ord("z")

122

ord("A")

65

ord("Z")

90

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chr(97) # function chr convert ASCII number to letter, reverse ord

'a'

chr(65)

'A'

chr(122)

'z'

chr(90)

"Z"

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hex(100) # function hex convert number to hexadecimal string

'0x64'

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oct(90) # function oct convert number to octal string

'0o132'