La función integrada type () puede consultar el tipo de objeto al que apunta la variable
También puede utilizar la función de instancia () incorporada para juzgar
El valor verdadero en Python es 1 y el valor falso es 0
El punto flotante tiene solo un flotador de precisión simple, sin precisión doble
In [1]: a=100
In [2]:type(a)
Out[2]:int
In [3]: b=a
In [4]: b
Out[4]:100
In [5]: a='abc'
In [6]: b=a
In [7]:type(b)
Out[7]:str
In [8]: f=1.23
In [9]:type(f)
Out[9]:float
In [10]: f1=1.23*e9
---------------------------------------------------------------------------
NameError Traceback (most recent call last)<ipython-input-10-d99753a72dde>in<module>---->1 f1=1.23*e9
NameError: name 'e9'isnot defined
In [11]: f1=1.23e9
In [12]:3>2
Out[12]:True
In [13]:3>5
Out[13]:False
In [14]:TrueandTrue
Out[14]:True
In [15]:TrueandFalse
Out[15]:False
In [16]:5>3and3>1
Out[16]:True
In [17]:TrueorTrue
Out[17]:True
In [18]:TrueorFalse
Out[18]:True
In [19]:5>3or3<1
Out[19]:True
In [20]:notFalse
Out[20]:True
In [21]:notTrue
Out[21]:False
In [22]:not1>2
Out[22]:True
In [23]:None
In [24]: a=None
In [25]:# None 是没有申请内存空间
In [26]:type(a)
Out[26]: NoneType
In [27]:# python 是动态语言
In [28]: x=10
In [29]: x=x+2
In [30]: x
Out[30]:12
In [31]:10/3
Out[31]:3.3333333333333335
In [32]:9/3
Out[32]:3.0
In [33]:10//3
Out[33]:3
In [34]:10%3
Out[34]:1
In [35]:2**2
Out[35]:4
In [36]:2**3
Out[36]:8