python3常见操作
布尔操作,是或者否:
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if x is false, then y, else x |
(1) |
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if x is false, then x, else y |
(2) |
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if x is false, then |
(3)
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比较操作,大还是小,是否相同对象,是否相同值:
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strictly less than |
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less than or equal |
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strictly greater than |
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greater than or equal |
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equal |
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not equal |
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object identity |
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negated object identity
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常用数学计算:
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sum of x and y |
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difference of x and y |
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product of x and y |
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quotient of x and y |
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floored quotient of x and y |
(1) |
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remainder of |
(2) |
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x negated |
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x unchanged |
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absolute value or magnitude of x |
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x converted to integer |
(3)(6) |
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x converted to floating point |
(4)(6) |
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a complex number with real part re, imaginary part im. im defaults to zero. |
(6) |
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conjugate of the complex number c |
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the pair |
(2) |
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x to the power y |
(5) |
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x to the power y |
(5)
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字符串常见操作:
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(1) |
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(1) |
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the concatenation of s and t |
(6)(7) |
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equivalent to adding s to itself n times |
(2)(7) |
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ith item of s, origin 0 |
(3) |
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slice of s from i to j |
(3)(4) |
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slice of s from i to j with step k |
(3)(5) |
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length of s |
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smallest item of s |
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largest item of s |
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index of the first occurrence of x in s (at or after index i and before index j) |
(8) |
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total number of occurrences of x in s
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数组常见操作:
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item i of s is replaced by x |
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slice of s from i to j is replaced by the contents of the iterable t |
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same as |
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the elements of |
(1) |
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removes the elements of |
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appends x to the end of the sequence (same as |
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removes all items from s (same as |
(5) |
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creates a shallow copy of s (same as |
(5) |
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extends s with the contents of t (for the most part the same as |
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updates s with its contents repeated n times |
(6) |
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inserts x into s at the index given by i(same as |
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retrieves the item at i and also removes it from s |
(2) |
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remove the first item from s where |
(3) |
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reverses the items of s in place |
(4)
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常见格式化占位符:
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Signed integer decimal. |
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Signed integer decimal. |
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Signed octal value. |
(1) |
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Obsolete type – it is identical to |
(6) |
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Signed hexadecimal (lowercase). |
(2) |
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Signed hexadecimal (uppercase). |
(2) |
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Floating point exponential format (lowercase). |
(3) |
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Floating point exponential format (uppercase). |
(3) |
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Floating point decimal format. |
(3) |
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Floating point decimal format. |
(3) |
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Floating point format. Uses lowercase exponential format if exponent is less than -4 or not less than precision, decimal format otherwise. |
(4) |
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Floating point format. Uses uppercase exponential format if exponent is less than -4 or not less than precision, decimal format otherwise. |
(4) |
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Single character (accepts integer or single character string). |
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String (converts any Python object using |
(5) |
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String (converts any Python object using |
(5) |
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String (converts any Python object using |
(5) |
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No argument is converted, results in a |
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