python是否需要每行以分号结束

zhangjies-MacBook-Air:~ zhangjie$python
Python 2.7.9 (default, Jul 14 2015, 12:18:43) 
[GCC 4.2.1 Compatible Apple LLVM 6.1.0 (clang-602.0.49)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> print "hello world!"
hello world!
>>> print "hello world!";
hello world!
>>> a = 1 print a
  File "<stdin>", line 1
    a = 1 print a
              ^
SyntaxError: invalid syntax
>>> a = 1; print a
1
>>> a = 1; print a;
1
>>>