函数默认值初始化引起的问题
妙音
posted @ 2018年3月30日 17:58
in python
, 1296 阅读
函数的默认值只会创建一次，之后不会再变了，使用对象(列表、字典、实例)作为默认值，会导致函数混乱
- 官方说明
- 示例
def f(a, L=[]):
L.append(a)
return L
for i in range(3):
print f(i)
#输出
[0]
[0, 1]
[0, 1, 2]
- 规避方法
def f(a, t=None):
t = t or []
t.append(a)
return t
印光大师十念法（胡小林主讲第1集）
2020年12月19日 01:56
Positive site, where did u come up with the information on this posting?I have read a few of the articles on your website now, and I really like your style. Thanks a million and please keep up the effective work. baby wrap
2020年12月21日 14:39
The worst part of it was that the software only worked intermittently and the data was not accurate. You obviously canot confront anyone about what you have discovered if the information is not right. huawei p30
2020年12月22日 13:57
Thanks for a very interesting blog. What else may I get that kind of info written in such a perfect approach? I’ve a undertaking that I am simply now operating on, and I have been at the look out for such info. bread maker machine
2020年12月24日 04:49
Great tips and very easy to understand. This will definitely be very useful for me when I get a chance to start my blog. leaf blower
2020年12月25日 11:55
Our products are of the highest quality and are packed in discrete odor less vacuum sealed packages. Discreet delivery is our recommended best practice and packages are tracked all the way to your home.
<a href="https://exoticbudshop.org/" rel="dofollow">Buddha bear carts</a>
<a href="https://exoticbudshop.org/product/buy-buddha-bear-carts/" rel="dofollow">Buddha bear carts</a> at prices that just can not be beaten.
Following the footsteps of plenty of other countries and states that have realized the health benefits of medicating with cannabis. We believe patients should have access to the best quality.
<a href="https://exoticbudshop.org/product/buy-buddha-bear-carts/" rel="dofollow">buddha bear carts for sale</a> Free Shipping on orders above $200
<a href="https://exoticbudshop.org/product/buy-buddha-bear-carts/" rel="dofollow">Buddah bear carts</a>
<a href="https://exoticbudshop.org/product/buy-buddha-bear-carts/" rel="dofollow">buddha bear carts</a>
<a href="https://exoticbudshop.org/product/buy-krt-carts-online/" rel="dofollow">KRT carts</a>
<a href="https://exoticbudshop.org/product/buy-krt-carts-online/" rel="dofollow">Buy KRT carts</a> Buy quality THC VAPE AT EXOTICBUDSHOP and have it deliver to you discretely
<a href="https://exoticbudshop.org/product/buy-biscotti-boyz-tins-weed/" rel="dofollow">biscottiboyz</a> > Discreet delivery is our recommended best practice and packages are tracked all the way to your home.
<a href="https://exoticbudshop.org/product/buy-lucky-carts-online/" rel="dofollow">lucky carts</a> Our products are of great quality
<a href="https://exoticbudshop.org/product/buy-lucky-carts-online/" rel="dofollow">buy lucky carts</a>
<a href="https://exoticbudshop.org/product/muha-meds-carts-for-sale/" rel="dofollow">muhameds carts</a> Our products are of great quality
<a href="https://exoticbudshop.org/product/muha-meds-carts-for-sale/" rel="dofollow">buy muhameds carts</a>
<a href="https://exoticbudshop.org/product/muha-meds-carts-for-sale/" rel="dofollow">buy muhameds carts online</a> Our products are of great quality
2020年12月30日 13:06
I think this is an informative post and it is very useful and knowledgeable. therefore, I would like to thank you for the efforts you have made in writing this article. Buy Facebook Reactions