1变量不用定义类型， 可以直接赋值

>>> a =5
>>> a
5

>>> a='hello'
>>> a
'hello'

 

2 变量类型可以直接用type显示

>>> type(a)
<class 'str'>

>>> a=4
>>> type(a)
<class 'int'>

 

3 print 可以打印数值，里面要有‘’ 或 “”

>>> print(a)
4
>>> print('hello')
hello
>>> print("hello")
hello

错误示范：

>>> print(hello)
Traceback (most recent call last):
File "<pyshell#11>", line 1, in <module>
print(hello)
NameError: name 'hello' is not defined