Random.randint() 刷新后不起作用

Question

我正在尝试用python编写简单的字符创建页面。我想要重新滚动统计数据的选项。问题是，刷新页面后，统计信息保持不变。下面是我的代码：

Views.py

 from my import Character
 ...
 def create_character():
  characterform = CharacterForm() 
   if request.method == 'GET':
   hero = Character()
   hero.gen_stat()
   return render_template('create_character.html', hero = hero, form = characterform)

my.py

class Character():
 def __init__(self):
  self.attack  = 0
  self.defense = 0
  self.hp      = 0
  self.ini     = 0

 def gen_stat(self,attack = randint(0,10), defense = randint(0,10), hp = randint(10,20), ini = randint(0,5)):
  self.attack  = attack
  self.defense = defense 
  self.hp      = hp
  self.ini     = ini

我现在正在学习python，所以很可能我做错了什么。奇怪的是，如果我在几分钟后刷新，统计数据会发生变化，所以也许它与缓存有关？

请帮我解决这个问题。

Answer 1

默认参数仅计算一次（创建函数时）。

>>> def g():
...     print('g() is called')
...     return 1
... 
>>> def f(a=g()): # g() is called when f is created.
...     pass
... 
g() is called
>>> f() # g() is not called!
>>> f() # g() is not called!

将gen_stat替换为以下内容：

def gen_stat(self, attack=None, defense=None, hp=None, ini=None):
    self.attack  = randint(0, 10) if attack  is None else attack
    self.defense = randint(0, 10) if defence is None else defense
    self.hp      = randint(0, 10) if hp      is None else hp
    self.ini     = randint(0, 10) if ini     is None else ini

顺便说一句，根据PEP 8 - Python Code的风格指南：

在以下情况下避免使用多余的空格：

。

• 工作分配（或其他）运算符周围有多个空格，以将其与另一个运算符对齐。

  是的：

  x = 1
  y = 2
  long_variable = 3
  

  不：

  x             = 1
  y             = 2
  long_variable = 3