python help(int)

class int(object)

| int(x=0) -> integer
| int(x, base=10) -> integer
|

| Convert a number or string to an integer, or return 0 if no arguments
| are given. If x is a number, return x.__int__(). For floating point
| numbers, this truncates towards zero.

| If x is not a number or if base is given, then x must be a string,
| bytes, or bytearray instance representing an integer literal in the
| given base. The literal can be preceded by '+' or '-' and be surrounded
| by whitespace. The base defaults to 10. Valid bases are 0 and 2-36.
| Base 0 means to interpret the base from the string as an integer literal.

| 将一个数字或字符串转换成整数，没有参数的时候为默认值0。如果参数时数字，调用__init__()，参数为浮点数，会发生截取。

|当x参数时不是数字时，或者有参数base，那么x参数一定是字面值是整数的字符串，字节流，或者是字节数组。这个字面值可以有正负号，前后可以有空格。

|base参数默认是10，base允许是0,2到36。如果base是0的时候，会根据字符串的字面值判断base的值。

a = int('100', 2)
print(a)
a = int('0b100', 0)
print(a)

4
4

| >>> int('0b100', base=0)
| 4
|
| Methods defined here:
|
| __abs__(self, /)
| abs(self)

print(abs(-10))
print(abs(10))

10
10

|
| __add__(self, value, /)
| Return self+value.

print(10 + 10 + 10)

30

|
| __and__(self, value, /)
| Return self&value.

print(1 & 3)

1

|
| __bool__(self, /)
| self != 0

if 1:
    print("True")
if 0:
    pass
else:
    print("False")

True
False

|
| __ceil__(...)
| Ceiling of an Integral returns itself.

返回一个大于或者等于x的最小整数。

import math
print(math.ceil(10))
print(math.ceil(9.2))
print(math.ceil(-8.2))

10
10
-8

|
| __divmod__(self, value, /)
| Return divmod(self, value).

返回一个元组，一个值是x//y，第二个值是x%y。

print(divmod(10, 3))

(3, 1)

|
| __eq__(self, value, /)
| Return self==value.

print(5 == 5)

True

|
| __float__(self, /)
| float(self)

print(float(5))

5.0

|
| __floor__(...)
| Flooring an Integral returns itself.

返回数字的下舍整数。

>>> import math
>>> math.floor(5)
5
>>> math.floor(5.1)
5
>>> math.floor(-5.1)
-6

|
| __floordiv__(self, value, /)
| Return self//value.

地板除。

>>> 5//2
2

|
| __format__(...)
| default object formatter

|
| __ge__(self, value, /)
| Return self>=value.

>>> 10 >= 5
True

|
| __getattribute__(self, name, /)
| Return getattr(self, name).

|
| __getnewargs__(...)

|
| __gt__(self, value, /)
| Return self>value.

>>> 10 > 5
True

|
| __hash__(self, /)
| Return hash(self).

获取一个对象（字符串或者数值等）的哈希值。

>>> hash(15)
15
>>> hash(15.5)
1152921504606846991
>>> hash('wang')
-1275867606344747311

|
| __index__(self, /)
| Return self converted to an integer, if self is suitable for use as an index into a list.

|
| __int__(self, /)
| int(self)

>>> int(10)
10
>>> int(10.10)
10

|
| __invert__(self, /)
| ~self

>>> ~0
-1
>>> ~1
-2
>>> ~-1
0
>>> ~-2
1

|
| __le__(self, value, /)
| Return self<=value.

>>> 10 <= 5
False

|
| __lshift__(self, value, /)
| Return self<<value.

>>> 1 << 1
2

|
| __lt__(self, value, /)
| Return self<value.

>>> 1 < 1
False

|
| __mod__(self, value, /)
| Return self%value.

>>> 5 % 2
1

|
| __mul__(self, value, /)
| Return self*value.

>>> 5 * 2
10

|
| __ne__(self, value, /)
| Return self!=value.

>>> 5 != 2
True

|
| __neg__(self, /)
| -self

>>> -10
-10
>>> --10
10

|
| __new__(*args, **kwargs) from builtins.type
| Create and return a new object. See help(type) for accurate signature.

|
| __or__(self, value, /)
| Return self|value.

>>> 1 | 0
1

|
| __pos__(self, /)
| +self

>>> +5
5
>>> +-5
-5

|
| __pow__(self, value, mod=None, /)
| Return pow(self, value, mod).

>>> pow(2, 2)
4
>>> pow(3, 3)
27

|
| __radd__(self, value, /)
| Return value+self.

|
| __rand__(self, value, /)
| Return value&self.
|
| __rdivmod__(self, value, /)
| Return divmod(value, self).

|
| __repr__(self, /)
| Return repr(self).

>>> repr(10)
'10'

|
| __rfloordiv__(self, value, /)
| Return value//self.
|
| __rlshift__(self, value, /)
| Return value<<self.
|
| __rmod__(self, value, /)
| Return value%self.
|
| __rmul__(self, value, /)
| Return value*self.
|
| __ror__(self, value, /)
| Return value|self.
|
| __round__(...)
| Rounding an Integral returns itself.
| Rounding with an ndigits argument also returns an integer.

|
| __rpow__(self, value, mod=None, /)
| Return pow(value, self, mod).
|
| __rrshift__(self, value, /)
| Return value>>self.
|
| __rshift__(self, value, /)
| Return self>>value.
|
| __rsub__(self, value, /)
| Return value-self.
|
| __rtruediv__(self, value, /)
| Return value/self.
|
| __rxor__(self, value, /)
| Return value^self.
|
| __sizeof__(...)
| Returns size in memory, in bytes

|
| __str__(self, /)
| Return str(self).
|
| __sub__(self, value, /)
| Return self-value.
|
| __truediv__(self, value, /)
| Return self/value.
|
| __trunc__(...)
| Truncating an Integral returns itself.
|
| __xor__(self, value, /)
| Return self^value.
|
| bit_length(...)
| int.bit_length() -> int
|
| Number of bits necessary to represent self in binary.
| >>> bin(37)
| '0b100101'
| >>> (37).bit_length()
| 6
|
| conjugate(...)
| Returns self, the complex conjugate of any int.
|
| from_bytes(...) from builtins.type
| int.from_bytes(bytes, byteorder, *, signed=False) -> int
|
| Return the integer represented by the given array of bytes.
|
| The bytes argument must be a bytes-like object (e.g. bytes or bytearray).
|
| The byteorder argument determines the byte order used to represent the
| integer. If byteorder is 'big', the most significant byte is at the
| beginning of the byte array. If byteorder is 'little', the most
| significant byte is at the end of the byte array. To request the native
| byte order of the host system, use `sys.byteorder' as the byte order value.
|
| The signed keyword-only argument indicates whether two's complement is
| used to represent the integer.
|
| to_bytes(...)
| int.to_bytes(length, byteorder, *, signed=False) -> bytes
|
| Return an array of bytes representing an integer.
|
| The integer is represented using length bytes. An OverflowError is
| raised if the integer is not representable with the given number of
| bytes.
|
| The byteorder argument determines the byte order used to represent the
| integer. If byteorder is 'big', the most significant byte is at the
| beginning of the byte array. If byteorder is 'little', the most
| significant byte is at the end of the byte array. To request the native
| byte order of the host system, use `sys.byteorder' as the byte order value.
|
| The signed keyword-only argument determines whether two's complement is
| used to represent the integer. If signed is False and a negative integer
| is given, an OverflowError is raised.
|
| ----------------------------------------------------------------------
| Data descriptors defined here:
|
| denominator
| the denominator of a rational number in lowest terms
|
| imag
| the imaginary part of a complex number
|
| numerator
| the numerator of a rational number in lowest terms
|
| real
| the real part of a complex number