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