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  2016-01-20 14:29  中国润滑油信息网
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变量的效果域

# python能够篡改变量效果域的代码段是def、class、lamda.

# if/elif/else、try/except/finally、for/while 并不能触及变量效果域的变动,也等于说他们的代码块中的变量,在外部也是能够拜访的

# 变量查找道路是:本地变量->全局变量

#只需内存中存在,则就可用

#################################################################

三元运算符

python中的三元运算和其余言语的三元运算有一些差异

原先现要领如下:

reulst= var1 if condition else var2

# 要是condition 为真值 则 result 的值为 var1 , 要是condition的值为假,则 result 的成果为var2

##################################################################

进制(进制位)

不一样进制的差异在于书运算时,逢几进一,几进制等于逢几进一,

二进制:注解数字 0和1;python中以 0b 最初

八进制: 注解数字,;python中以0最初

十进制:

十六进制:注解数字ABCDEF,python以0x最初

#####################################################################

python根底

观点:在python中整个事物都是目标,目标根据类来创立,(往后详细说明);

python运用目标模型来存储数据,布局任何类型的值都是一个目标,以是,在python的国际里,整个皆目标,一个整数是一个目标,一张各字符串也是一个目标,一个类型也是一个目标......

类:具有同种特征的目标称为类,是一个笼统的观点,例:轿车、人、牛、

目标:类的实例化,例:黄种人、黑人、白人等都是人的实例化,

######################################################################

提前筹备知识:

type()# 反省目标类型,例: type(lst)

dir()#反省类的法子列表,例:dir(lst)

help()#反省类的详细信息,例:help(lst)

help()#反省类法子的信息,例:help(lst)

#####################################################################

int 型

www.7000bet.com【官网】》》》》》》##

class int(object):

"""

int(x=0) -> int or long

int(x, base=10) -> int or long

Convert a number or string to an integer, or return 0 if no arguments

are given.If x is floating point, the conversion truncates towards zero.

If x is outside the integer range, the function returns a long instead.

If x is not a number or if base is given, then x must be a string or

Unicode object 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.

>>> int('0b100', base=0)

4

"""

def bit_length(self): # real signature unknown; restored from __doc__

"""

int.bit_length() -> int

Number of bits necessary to represent self in binary.

回来注解该数字时 的占用的最小位数(二进制)

>>> bin(37)

'0b'

>>> (37).bit_length()

6

"""

return 0

def conjugate(self, *args, **kwargs): # real signature unknown

""" Returns self, the complex conjugate of any int.

回来共轭复数

"""

pass

def __abs__(self): # real signature unknown; restored from __doc__

""" x.__abs__()abs(x)

回来 绝对值

"""

pass

def __add__(self, y): # real signature unknown; restored from __doc__

""" x.__add__(y)x+y

乞降

"""

pass

def __and__(self, y): # real signature unknown; restored from __doc__

""" x.__and__(y)x&y """

pass

def __cmp__(self, y): # real signature unknown; restored from __doc__

""" x.__cmp__(y)cmp(x,y)

比较巨细, 大年夜于、即是、小于时 分袂回来1 0 -1

"""

pass

def __coerce__(self, y): # real signature unknown; restored from __doc__

""" x.__coerce__(y)coerce(x, y)

强行回来x和y构成的一个元组

"""

pass

def __divmod__(self, y): # real signature unknown; restored from __doc__

""" x.__divmod__(y)divmod(x, y)

回来x和y相除往后,商和余数构成的元组

"""

pass

def __div__(self, y): # real signature unknown; restored from __doc__

""" x.__div__(y)x/y """

pass

def __float__(self): # real signature unknown; restored from __doc__

""" x.__float__()float(x)

变换为浮点类型

"""

pass

def __floordiv__(self, y): # real signature unknown; restored from __doc__

""" x.__floordiv__(y)x//y """

pass

def __format__(self, *args, **kwargs): # real signature unknown

pass

def __getattribute__(self, name): # real signature unknown; restored from __doc__

""" x.__getattribute__('name')x.name """

pass

def __getnewargs__(self, *args, **kwargs): # real signature unknown

“”“内部调用, __new__ 法子或许闯将目标时,传入参数运用”“”

pass

def __hash__(self): # real signature unknown; restored from __doc__

""" x.__hash__()hash(x)

要是目标 object为哈希表类型,则回来目标object的哈希值,哈希值为整数,

在字典中查找时,哈希值用于疾速比较两个字典的键,要是两个键持平,则哈希值也持平

"""

pass

def __hex__(self): # real signature unknown; restored from __doc__

""" x.__hex__()hex(x)

回来当前值的 16进制 注解的数

"""

pass

def __index__(self): # real signature unknown; restored from __doc__

""" x[y:z]x[y.__index__():z.__index__()]

用于切片,数字无意义

"""

pass

def __init__(self, x, base=10): # known special case of int.__init__

"""

int(x=0) -> int or long

int(x, base=10) -> int or long

Convert a number or string to an integer, or return 0 if no arguments

are given.If x is floating point, the conversion truncates towards zero.

If x is outside the integer range, the function returns a long instead.

If x is not a number or if base is given, then x must be a string or

Unicode object 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.

>>> int('0b100', base=0)

4

# (copied from class doc)

布局法子,实行x=123或许 x=int(10) 时 主动调用

"""

pass

def __int__(self): # real signature unknown; restored from __doc__

""" x.__int__()int(x) """

pass

def __invert__(self): # real signature unknown; restored from __doc__

""" x.__invert__()~x """

pass

def __long__(self): # real signature unknown; restored from __doc__

""" x.__long__()long(x) """

pass

def __lshift__(self, y): # real signature unknown; restored from __doc__

""" x.__lshift__(y)x x%y """

pass

def __mul__(self, y): # real signature unknown; restored from __doc__

""" x.__mul__(y)x*y """

pass

def __neg__(self): # real signature unknown; restored from __doc__

""" x.__neg__()-x """

pass

@staticmethod # known case of __new__

def __new__(S, *more): # real signature unknown; restored from __doc__

""" T.__new__(S, ...) -> a new object with type S, a subtype of T """

pass

def __nonzero__(self): # real signature unknown; restored from __doc__

""" x.__nonzero__()x != 0 """

pass

def __oct__(self): # real signature unknown; restored from __doc__

""" x.__oct__()oct(x)

回来 该数字的 八进制 注解的数

"""

pass

def __or__(self, y): # real signature unknown; restored from __doc__

""" x.__or__(y)x|y """

pass

def __pos__(self): # real signature unknown; restored from __doc__

""" x.__pos__()+x """

pass

def __四房pow__(self, y, z=None): # real signature unknown; restored from __doc__

""" x.__pow__(y[, z])pow(x, y[, z])

幂运算、次方运算

"""

pass

def __radd__(self, y): # real signature unknown; restored from __doc__

""" x.__radd__(y)y+x """

pass

def __rand__(self, y): # real signature unknown; restored from __doc__

""" x.__rand__(y)y&x """

pass

def __rdivmod__(self, y): # real signature unknown; restored from __doc__

""" x.__rdivmod__(y)divmod(y, x) """

pass

def __rdiv__(self, y): # real signature unknown; restored from __doc__

""" x.__rdiv__(y)y/x """

pass

def __repr__(self): # real signature unknown; restored from __doc__

""" x.__repr__()repr(x)

变换为讲解器可读取的要领

"""

pass

def __rfloordiv__(self, y): # real signature unknown; restored from __doc__

""" x.__rfloordiv__(y)y//x """

pass

def __rlshift__(self, y): # real signature unknown; restored from __doc__

""" x.__rlshift__(y)y y%x """

pass

def __rmul__(self, y): # real signature unknown; restored from __doc__

""" x.__rmul__(y)y*x """

pass

def __ror__(self, y): # real signature unknown; restored from __doc__

""" x.__ror__(y)y|x """

pass

def __rpow__(self, x, z=None): # real signature unknown; restored from __doc__

""" y.__rpow__(x[, z])pow(x, y[, z]) """

pass

def __rrshift__(self, y): # real signature unknown; restored from __doc__

""" x.__rrshift__(y)y>>x """

pass

def __rshift__(self, y): # real signature unknown; restored from __doc__

""" x.__rshift__(y)x>>y """

pass

def __rsub__(self, y): # real signature unknown; restored from __doc__

""" x.__rsub__(y)y-x """

pass

def __rtruediv__(self, y): # real signature unknown; restored from __doc__

""" x.__rtruediv__(y)y/x """

pass

def __rxor__(self, y): # real signature unknown; restored from __doc__

""" x.__rxor__(y)y^x """

pass

def __str__(self): # real signature unknown; restored from __doc__

""" x.__str__()str(x)

变换为人阅览的要领,要是没有适用于人阅览的讲解要领的话,则回来讲解器可阅览的要领

"""

pass

def __sub__(self, y): # real signature unknown; restored from __doc__

""" x.__sub__(y)x-y """

pass

def __truediv__(self, y): # real signature unknown; restored from __doc__

""" x.__truediv__(y)x/y """

pass

def __trunc__(self, *args, **kwargs): # real signature unknown

""" Truncating an Integral returns itself.

回来该数值被截取为整型的值,整型中无意义

"""

pass

def __xor__(self, y): # real signature unknown; restored from __doc__

""" x.__xor__(y)x^y """

pass

denominator = property(lambda self: object(), lambda self, v: None, lambda self: None)# default

"""the denominator of a rational number in lowest terms"""

imag = property(lambda self: object(), lambda self, v: None, lambda self: None)# default

"""the imaginary part of a complex number"""

numerator = property(lambda self: object(), lambda self, v: None, lambda self: None)# default

"""the numerator of a rational number in lowest terms"""

real = property(lambda self: object(), lambda self, v: None, lambda self: None)# default

"""the real part of a complex number"""

##

#####################################################################

long 型

大年夜多半法子与int型相似,可参阅int型

##

class long(object):

"""

long(x=0) -> long

long(x, base=10) -> long

Convert a number or string to a long integer, or return 0L if no arguments

are given.If x is floating point, the conversion truncates towards zero.

If x is not a number or if base is given, then x must be a string or

Unicode object 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.

>>> int('0b100', base=0)

4L

"""

def bit_length(self): # real signature unknown; restored from __doc__

"""

long.bit_length() -> int or long

Number of bits necessary to represent self in binary.

>>> bin(37L)

'0b'

>>> (37L).bit_length()

6

"""

return 0

def conjugate(self, *args, **kwargs): # real signature unknown

""" Returns self, the complex conjugate of any long. """

pass

def __abs__(self): # real signature unknown; restored from __doc__

""" x.__abs__()abs(x) """

pass

def __add__(self, y): # real signature unknown; restored from __doc__

""" x.__add__(y)x+y """

pass

def __and__(self, y): # real signature unknown; restored from __doc__

""" x.__and__(y)x&y """

pass

def __cmp__(self, y): # real signature unknown; restored from __doc__

""" x.__cmp__(y)cmp(x,y) """

pass

def __coerce__(self, y): # real signature unknown; restored from __doc__

""" x.__coerce__(y)coerce(x, y) """

pass

def __divmod__(self, y): # real signature unknown; restored from __doc__

""" x.__divmod__(y)divmod(x, y) """

pass

def __div__(self, y): # real signature unknown; restored from __doc__

""" x.__div__(y)x/y """

pass

def __float__(self): # real signature unknown; restored from __doc__

""" x.__float__()float(x) """

pass

def __floordiv__(self, y): # real signature unknown; restored from __doc__

""" x.__floordiv__(y)x//y """

pass

def __format__(self, *args, **kwargs): # real signature unknown

pass

def __getattribute__(self, name): # real signature unknown; restored from __doc__

""" x.__getattribute__('name')x.name """

pass

def __getnewargs__(self, *args, **kwargs): # real signature unknown

pass

def __hash__(self): # real signature unknown; restored from __doc__

""" x.__hash__()hash(x) """

pass

def __hex__(self): # real signature unknown; restored from __doc__

""" x.__hex__()hex(x) """

pass

def __index__(self): # real signature unknown; restored from __doc__

""" x[y:z]x[y.__index__():z.__index__()] """

pass

def __init__(self, x=0): # real signature unknown; restored from __doc__

pass

def __int__(self): # real signature unknown; restongbao918.comtored from __doc__

""" x.__int__()int(x) """

pass

def __invert__(self): # real signature unknown; restored from __doc__

""" x.__invert__()~x """

pass

def __long__(self): # real signature unknown; restored from __doc__

""" x.__long__()long(x) """

pass

def __lshift__(self, y): # real signature unknown; restored from __doc__

""" x.__lshift__(y)x x%y """

pass

def __mul__(self, y): # real signature unknown; restored from __doc__

""" x.__mul__(y)x*y """

pass

def __neg__(self): # real signature unknown; restored from __doc__

""" x.__neg__()-x """

pass

@staticmethod # known case of __new__

def __new__(S, *more): # real signature unknown; restored from __doc__

""" T.__new__(S, ...) -> a new object with type S, a subtype of T """

pass

def __nonzero__(self): # real signature unknown; restored from __doc__

""" x.__nonzero__()x != 0 """

pass

def __oct__(self): # real signature unknown; restored from __doc__

""" x.__oct__()oct(x) """

pass

def __or__(self, y): # real signature unknown; restored from __doc__

""" x.__or__(y)x|y """

pass

def __pos__(self): # real signature unknown; restored from __doc__

""" x.__pos__()+x """

pass

def __pow__(self, y, z=None): # real signature unknown; restored from __doc__

""" x.__pow__(y[, z])pow(x, y[, z]) """

pass

def __radd__(self, y): # real signature unknown; restored from __doc__

""" x.__radd__(y)y+x """

pass

def __rand__(self, y): # real signature unknown; restored from __doc__

""" x.__rand__(y)y&x """

pass

def __rdivmod__(self, y): # real signature unknown; restored from __doc__

""" x.__rdivmod__(y)divmod(y, x) """

pass

def __rdiv__(self, y): # real signature unknown; restored from __doc__

""" x.__rdiv__(y)y/x """

pass

def __repr__(self): # real signature unknown; restored from __doc__

""" x.__repr__()repr(x) """

pass

def __rfloordiv__(self, y): # real signature unknown; restored from __doc__

""" x.__rfloordiv__(y)y//x """

pass

def __rlshift__(self, y): # real signature unknown; restored from __doc__

""" x.__rlshift__(y)y y%x """

pass

def __rmul__(self, y): # real signature unknown; restored from __doc__

""" x.__rmul__(y)y*x """

pass

def __ror__(self, y): # real signature unknown; restored from __doc__

""" x.__ror__(y)y|x """

pass

def __rpow__(self, x, z=None): # real signature unknown; restored from __doc__

www.7000bet.com【官网】》》》》》》

""" y.__rpow__(x[, z])pow(x, y[, z]) """

pass

def __rrshift__(self, y): # real signature unknown; restored from __doc__

""" x.__rrshift__(y)y>>x """

pass

def __rshift__(self, y): # real signature unknown; restored from __doc__

""" x.__rshift__(y)x>>y """

pass

def __rsub__(self, y): # real signature unknown; restored from __doc__

""" x.__rsub__(y)y-x """

pass

def __rtruediv__(self, y): # real signature unknown; restored from __doc__

""" x.__rtruediv__(y)y/x """

pass

def __rxor__(self, y): # real signature unknown; restored from __doc__

""" x.__rxor__(y)y^x """

pass

def __sizeof__(self, *args, **kwargs): # real signature unknown

""" Returns size in memory, in bytes """

pass

def __str__(self): # real signature unknown; restored from __doc__

""" x.__str__()str(x) """

pass

def __sub__(self, y): # real signature unknown; restored from __doc__

""" x.__sub__(y)x-y """

pass

def __truediv__(self, y): # real signature unknown; restored from __doc__

""" x.__truediv__(y)x/y """

pass

def __trunc__(self, *args, **kwargs): # real signature unknown

""" Truncating an Integral returns itself. """

pass

def __xor__(self, y): # real signature unknown; restored from __doc__

""" x.__xor__(y)x^y """

pass

denominator = property(lambda self: object(), lambda self, v: None, lambda self: None)# default

"""the denominator of a rational number in lowest terms"""

imag = property(lambda self: object(), lambda self, v: None, lambda self: None)# default

"""the imaginary part of a complex number"""

numerator = property(lambda self: object(), lambda self, v: None, lambda self: None)# default

"""the numerator of a rational number in lowest terms"""

real = property(lambda self: object(), lambda self, v: None, lambda self: None)# default

"""the real part of a complex number"""

##

这篇文章出自 “Will的条记” 博客,请必须保存此出处http://timesnotes.blog.51cto.com//

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