1.int整數
#整數：主要用來進行數學運算，在python3中所有的整數都是int類型，
#整數可以進行的操作有：bit_length(),計算整數在記憶體中占用的二進制碼的長度
#先來看看int整數的源碼寫了什麼，方法:按ctrl+滑鼠左鍵點int
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)
"""
def bit_length(self):
""" 傳回表示該數字的時占用的最少位數 """
"""
int.bit_length() -> int
Number of bits necessary to represent self in binary.
>>> bin(37)
'0b100101'
>>> (37).bit_length()
"""
return 0
def conjugate(self, *args, **kwargs): # real signature unknown
""" 傳回該複數的共轭複數 """
""" Returns self, the complex conjugate of any int. """
pass
def __abs__(self):
""" 傳回絕對值 """
""" x.__abs__() <==> abs(x) """
pass
def __add__(self, y):
""" x.__add__(y) <==> x+y """
pass
def __and__(self, y):
""" x.__and__(y) <==> x&y """
pass
def __cmp__(self, y):
""" 比較兩個數大小 """
""" x.__cmp__(y) <==> cmp(x,y) """
pass
def __coerce__(self, y):
""" 強制生成一個元組 """
""" x.__coerce__(y) <==> coerce(x, y) """
pass
def __divmod__(self, y):
""" 相除，得到商和餘數組成的元組 """
""" x.__divmod__(y) <==> divmod(x, y) """
pass
def __div__(self, y):
""" x.__div__(y) <==> x/y """
pass
def __float__(self):
""" 轉換為浮點類型 """
""" x.__float__() <==> float(x) """
pass
def __floordiv__(self, y):
""" x.__floordiv__(y) <==> x//y """
pass
def __format__(self, *args, **kwargs): # real signature unknown
pass
def __getattribute__(self, name):
""" x.__getattribute__('name') <==> x.name """
pass
def __getnewargs__(self, *args, **kwargs): # real signature unknown
""" 内部調用 __new__方法或建立對象時傳入參數使用 """
pass
def __hash__(self):
"""如果對象object為哈希表類型，傳回對象object的哈希值。哈希值為整數。在字典查找中，哈希值用于快速比較字典的鍵。兩個數值如果相等，則哈希值也相等。"""
""" x.__hash__() <==> hash(x) """
pass
def __hex__(self):
""" 傳回目前數的 十六進制 表示 """
""" x.__hex__() <==> hex(x) """
pass
def __index__(self):
""" 用于切片，數字無意義 """
""" x[y:z] <==> x[y.__index__():z.__index__()] """
pass
def __init__(self, x, base=10): # known special case of int.__init__
""" 構造方法，執行 x = 123 或 x = int(10) 時，自動調用，暫時忽略 """
"""
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)
# (copied from class doc)
"""
pass
def __int__(self):
""" 轉換為整數 """
""" x.__int__() <==> int(x) """
pass
def __invert__(self):
""" x.__invert__() <==> ~x """
pass
def __long__(self):
""" 轉換為長整數 """
""" x.__long__() <==> long(x) """
pass
def __lshift__(self, y):
""" x.__lshift__(y) <==> x<<y """
pass
def __mod__(self, y):
""" x.__mod__(y) <==> x%y """
pass
def __mul__(self, y):
""" x.__mul__(y) <==> x*y """
pass
def __neg__(self):
""" x.__neg__() <==> -x """
pass
@staticmethod # known case of __new__
def __new__(S, *more):
""" T.__new__(S, ...) -> a new object with type S, a subtype of T """
pass
def __nonzero__(self):
""" x.__nonzero__() <==> x != 0 """
pass
def __oct__(self):
""" 傳回改值的 八進制 表示 """
""" x.__oct__() <==> oct(x) """
pass
def __or__(self, y):
""" x.__or__(y) <==> x|y """
pass
def __pos__(self):
""" x.__pos__() <==> +x """
pass
def __pow__(self, y, z=None):
""" 幂，次方 """
""" x.__pow__(y[, z]) <==> pow(x, y[, z]) """
pass
def __radd__(self, y):
""" x.__radd__(y) <==> y+x """
pass
def __rand__(self, y):
""" x.__rand__(y) <==> y&x """
pass
def __rdivmod__(self, y):
""" x.__rdivmod__(y) <==> divmod(y, x) """
pass
def __rdiv__(self, y):
""" x.__rdiv__(y) <==> y/x """
pass
def __repr__(self):
"""轉化為解釋器可讀取的形式 """
""" x.__repr__() <==> repr(x) """
pass
def __str__(self):
"""轉換為人閱讀的形式，如果沒有适于人閱讀的解釋形式的話，則傳回解釋器課閱讀的形式"""
""" x.__str__() <==> str(x) """
pass
def __rfloordiv__(self, y):
""" x.__rfloordiv__(y) <==> y//x """
pass
def __rlshift__(self, y):
""" x.__rlshift__(y) <==> y<<x """
pass
def __rmod__(self, y):
""" x.__rmod__(y) <==> y%x """
pass
def __rmul__(self, y):
""" x.__rmul__(y) <==> y*x """
pass
def __ror__(self, y):
""" x.__ror__(y) <==> y|x """
pass
def __rpow__(self, x, z=None):
""" y.__rpow__(x[, z]) <==> pow(x, y[, z]) """
pass
def __rrshift__(self, y):
""" x.__rrshift__(y) <==> y>>x """
pass
def __rshift__(self, y):
""" x.__rshift__(y) <==> x>>y """
pass
def __rsub__(self, y):
""" x.__rsub__(y) <==> y-x """
pass
def __rtruediv__(self, y):
""" x.__rtruediv__(y) <==> y/x """
pass
def __rxor__(self, y):
""" x.__rxor__(y) <==> y^x """
pass
def __sub__(self, y):
""" x.__sub__(y) <==> x-y """
pass
def __truediv__(self, y):
""" x.__truediv__(y) <==> x/y """
pass
def __trunc__(self, *args, **kwargs):
""" 傳回數值被截取為整形的值，在整形中無意義 """
pass
def __xor__(self, y):
""" x.__xor__(y) <==> x^y """
pass
denominator = property(lambda self: object(), lambda self, v: None, lambda self: None) # default
""" 分母 = 1 """
"""the denominator of a rational number in lowest terms"""
imag = property(lambda self: object(), lambda self, v: None, lambda self: None) # default
""" 虛數，無意義 """
"""the imaginary part of a complex number"""
numerator = property(lambda self: object(), lambda self, v: None, lambda self: None) # default
""" 分子 = 數字大小 """
"""the numerator of a rational number in lowest terms"""
real = property(lambda self: object(), lambda self, v: None, lambda self: None) # default
""" 實屬，無意義 """
"""the real part of a complex number"""
int 複制
#例子：檢視整數在記憶體中占用的二進制長度
i = 2
print(i.bit_length()) #列印的最小位數是2
#2
#列印的長度為什麼是2呢？，因為十進制的2轉換位2進制就是10，長度是2
i = 7
print(i.bit_length()) #列印的最小位數是3
#3
#列印的長度為什麼是3呢？，因為十進制的5轉換位2進制就是101，長度是3
i = 10
print(i.bit_length()) #列印的最小位數是4
#4
#把數字轉換成最小的位數 複制
#下面我們來看一張十進制和二進制表轉換表就知道上面為什麼計算的長度是多少了
#例如：上面的結果15，轉換成二進制是1111，是以長度是4
2.bool值
判斷真假，結果隻有True，和False
空值有：0,'',None,[],(),{},set() 都是False 複制
#類型轉換
int ---> str 數字傳換成字元串：沒有條件
i = 1
s = str(i)
#str ---> int 字元串轉換成數字：隻能是數字
#s = '123e' #這個就是錯誤的，隻能是數字
s = '123'
i = int(s)
print(i)
print(int(s)) 複制
str ---> bool #字元串轉換成bool值
#非空字元串都是True，空字元串都是False
a = 0 #空字元串是False
print(bool(a)) #False
s = "" #空字元串是False
print(bool(s)) #False
lst = [1] #空的東西是False，非空的東西是True
print(bool(lst)) #True
a = None #表示空，真空
print(bool(a)) #False 複制
#int ---> bool 數字轉換成bool值
#主要是0--->False,非0就是True
i = 3
b = bool(i)
print(b) #True 複制
#總結點
1、所有的空都是False，所有的非空都是True
2、字元串轉換成數字，隻能是數字
3、想把某資料轉換成其他資料類型，格式為xxx(資料)
# str => int #字元串轉換成整數
# int(s) 複制