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python3常見操作

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?

?布爾操作,是或者否:

Operation

Result

Notes

x ? or ? y

if? x ?is false, then? y , else? x

(1)

x ? and ? y

if? x ?is false, then? x , else? y

(2)

not ? x

if? x ?is false, then? True , else? False

(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

is

object identity

is ? not

negated object identity

?

?

常用數(shù)學(xué)計(jì)算:

Operation

Result

Notes

Full documentation

x ? + ? y

sum of? x ?and? y

? ?

x ? - ? y

difference of? x ?and? y

? ?

x ? * ? y

product of? x ?and? y

? ?

x ? / ? y

quotient of? x ?and? y

? ?

x ? // ? y

floored quotient of? x ?and? y

(1)

?

x ? % ? y

remainder of? x ? / ? y

(2)

?

-x

x ?negated

? ?

+x

x ?unchanged

? ?

abs(x)

absolute value or magnitude of? x

?

abs()

int(x)

x ?converted to integer

(3)(6)

int()

float(x)

x ?converted to floating point

(4)(6)

float()

complex(re, ? im)

a complex number with real part? re , imaginary part? im .? im ?defaults to zero.

(6)

complex()

c.conjugate()

conjugate of the complex number? c

? ?

divmod(x, ? y)

the pair? (x ? // ? y, ? x ? % ? y)

(2)

divmod()

pow(x, ? y)

x ?to the power? y

(5)

pow()

x ? ** ? y

x ?to the power? y

(5)

?

?

字符串常見操作:

Operation

Result

Notes

x ? in ? s

True ?if an item of? s ?is equal to? x , else? False

(1)

x ? not ? in ? s

False ?if an item of? s ?is equal to? x , else? True

(1)

s ? + ? t

the concatenation of? s ?and? t

(6)(7)

s ? * ? n ?or? n ? * ? s

equivalent to adding? s ?to itself? n ?times

(2)(7)

s[i]

i th item of? s , origin 0

(3)

s[i:j]

slice of? s ?from? i ?to? j

(3)(4)

s[i:j:k]

slice of? s ?from? i ?to? j ?with step? k

(3)(5)

len(s)

length of? s

?

min(s)

smallest item of? s

?

max(s)

largest item of? s

?

s.index(x[, ? i[, ? j]])

index of the first occurrence of? x ?in? s ?(at or after index? i ?and before index? j )

(8)

s.count(x)

total number of occurrences of? x ?in? s

?

?

?

數(shù)組常見操作:

Operation

Result

Notes

s[i] ? = ? x

item? i ?of? s ?is replaced by? x

?

s[i:j] ? = ? t

slice of? s ?from? i ?to? j ?is replaced by the contents of the iterable? t

?

del ? s[i:j]

same as? s[i:j] ? = ? []

?

s[i:j:k] ? = ? t

the elements of? s[i:j:k] ?are replaced by those of? t

(1)

del ? s[i:j:k]

removes the elements of? s[i:j:k] from the list

?

s.append(x)

appends? x ?to the end of the sequence (same as? s[len(s):len(s)] ? = ? [x] )

?

s.clear()

removes all items from? s ?(same as? del ? s[:] )

(5)

s.copy()

creates a shallow copy of? s ?(same as? s[:] )

(5)

s.extend(t) ?or? s ? += ? t

extends? s ?with the contents of? t ?(for the most part the same as s[len(s):len(s)] ? = ? t )

?

s ? *= ? n

updates? s ?with its contents repeated? n ?times

(6)

s.insert(i, ? x)

inserts? x ?into? s ?at the index given by? i (same as? s[i:i] ? = ? [x] )

?

s.pop([i])

retrieves the item at? i ?and also removes it from? s

(2)

s.remove(x)

remove the first item from? s ?where? s[i] ?is equal to? x

(3)

s.reverse()

reverses the items of? s ?in place

(4)

?

?

常見格式化占位符:

Conversion

Meaning

Notes

'd'

Signed integer decimal.

?

'i'

Signed integer decimal.

?

'o'

Signed octal value.

(1)

'u'

Obsolete type – it is identical to? 'd' .

(6)

'x'

Signed hexadecimal (lowercase).

(2)

'X'

Signed hexadecimal (uppercase).

(2)

'e'

Floating point exponential format (lowercase).

(3)

'E'

Floating point exponential format (uppercase).

(3)

'f'

Floating point decimal format.

(3)

'F'

Floating point decimal format.

(3)

'g'

Floating point format. Uses lowercase exponential format if exponent is less than -4 or not less than precision, decimal format otherwise.

(4)

'G'

Floating point format. Uses uppercase exponential format if exponent is less than -4 or not less than precision, decimal format otherwise.

(4)

'c'

Single character (accepts integer or single character string).

?

'r'

String (converts any Python object using? repr() ).

(5)

's'

String (converts any Python object using? str() ).

(5)

'a'

String (converts any Python object using? ascii() ).

(5)

'%'

No argument is converted, results in a? '%' ?character in the result.

?

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