赋值运算符

c = 1 # 把1赋值给变量c
c = c+1 # 等价于 c += 1
c += 1
c -= 1
c *= 1
c /= 1
c %= 1
c **= 1
c //= 1

python 里没有自增，自减运算符

>>> c = 1
>>> c+=1
>>> c
2
>>> c++
  File "<stdin>", line 1
    c++
      ^
SyntaxError: invalid syntax
>>> c--
  File "<stdin>", line 1
    c--
      ^
SyntaxError: invalid syntax
>>>