?
?布爾操作,是或者否:
Operation
Result
Notes
|
if? x ?is false, then? y , else? x |
(1) |
|
if? x ?is false, then? x , else? y |
(2) |
|
if?
x
?is false, then?
|
(3) ? |
?
比較操作,大還是小,是否相同對(duì)象,是否相同值:
Operation
Meaning
|
strictly less than |
|
less than or equal |
|
strictly greater than |
|
greater than or equal |
|
equal |
|
not equal |
|
object identity |
|
negated object identity ? |
?
常用數(shù)學(xué)計(jì)算:
Operation
Result
Notes
Full documentation
|
sum of? x ?and? y |
? | ? |
|
difference of? x ?and? y |
? | ? |
|
product of? x ?and? y |
? | ? |
|
quotient of? x ?and? y |
? | ? |
|
floored quotient of? x ?and? y |
(1) |
? |
|
remainder of?
|
(2) |
? |
|
x ?negated |
? | ? |
|
x ?unchanged |
? | ? |
|
absolute value or magnitude of? x |
? |
|
|
x ?converted to integer |
(3)(6) |
|
|
x ?converted to floating point |
(4)(6) |
|
|
a complex number with real part? re , imaginary part? im .? im ?defaults to zero. |
(6) |
|
|
conjugate of the complex number? c |
? | ? |
|
the pair?
|
(2) |
|
|
x ?to the power? y |
(5) |
|
|
x ?to the power? y |
(5) ? |
?
字符串常見(jiàn)操作:
Operation
Result
Notes
|
|
(1) |
|
|
(1) |
|
the concatenation of? s ?and? t |
(6)(7) |
|
equivalent to adding? s ?to itself? n ?times |
(2)(7) |
|
i th item of? s , origin 0 |
(3) |
|
slice of? s ?from? i ?to? j |
(3)(4) |
|
slice of? s ?from? i ?to? j ?with step? k |
(3)(5) |
|
length of? s |
? |
|
smallest item of? s |
? |
|
largest item of? s |
? |
|
index of the first occurrence of? x ?in? s ?(at or after index? i ?and before index? j ) |
(8) |
|
total number of occurrences of? x ?in? s ? |
?
?
數(shù)組常見(jiàn)操作:
Operation
Result
Notes
|
item? i ?of? s ?is replaced by? x |
? |
|
slice of? s ?from? i ?to? j ?is replaced by the contents of the iterable? t |
? |
|
same as?
|
? |
|
the elements of?
|
(1) |
|
removes the elements of?
|
? |
|
appends?
x
?to the end of the sequence (same as?
|
? |
|
removes all items from?
s
?(same as?
|
(5) |
|
creates a shallow copy of?
s
?(same as?
|
(5) |
|
extends?
s
?with the contents of?
t
?(for the most part the same as
|
? |
|
updates? s ?with its contents repeated? n ?times |
(6) |
|
inserts?
x
?into?
s
?at the index given by?
i
(same as?
|
? |
|
retrieves the item at? i ?and also removes it from? s |
(2) |
|
remove the first item from?
s
?where?
|
(3) |
|
reverses the items of? s ?in place |
(4) ? |
?
常見(jiàn)格式化占位符:
Conversion
Meaning
Notes
|
Signed integer decimal. |
? |
|
Signed integer decimal. |
? |
|
Signed octal value. |
(1) |
|
Obsolete type – it is identical to?
|
(6) |
|
Signed hexadecimal (lowercase). |
(2) |
|
Signed hexadecimal (uppercase). |
(2) |
|
Floating point exponential format (lowercase). |
(3) |
|
Floating point exponential format (uppercase). |
(3) |
|
Floating point decimal format. |
(3) |
|
Floating point decimal format. |
(3) |
|
Floating point format. Uses lowercase exponential format if exponent is less than -4 or not less than precision, decimal format otherwise. |
(4) |
|
Floating point format. Uses uppercase exponential format if exponent is less than -4 or not less than precision, decimal format otherwise. |
(4) |
|
Single character (accepts integer or single character string). |
? |
|
String (converts any Python object using?
|
(5) |
|
String (converts any Python object using?
|
(5) |
|
String (converts any Python object using?
|
(5) |
|
No argument is converted, results in a?
|
? |
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