我是python的新手，当他们遇到一个包含较短列表值的条件时，尝试简单地替换列表的值。
例如：
list1 = [1,0,1,0,1,0]
list2 = [1,2,3]
我想要的输出是：
list1 = [1,1,1,2,1,3]
我可以使用带计数器的循环：
counter = 0
for i, j in enumerate(list1):
if j == 1:
list1[i] = list2[counter]
counter += 1
但是对于这么简单的事情来说这似乎效率低下，所以我猜测可能有一种方法可以通过列表理解来实现这一点，例如：
[list2[i] if j == 0 else j for i,j in enumerate(list1)]
（虽然由于列表长度不同而失败）。
有没有其他简洁的方法在base python中执行此操作，可能使用map或filter？
答案 0 :(得分：7)
您可以使用由短名单制作的迭代器，并在理解中只需调用next：
<!-- Clients -->
<section class="section-wrap clients bg-light" id="clients">
<div class="container">
<div class="row heading">
<div class="col-md-6 col-md-offset-3">
<h2 class="text-center bottom-line"><b>Clients</b></h2>
</div>
</div>
<div class="row" >
<div class="col-xs-6 col-sm-3" style="padding-bottom:20px;">
<center>
<a href="http://www.at60inches.com/" onMouseOver="MM_swapImage('@60','','img/C-60-over.png',1)" onMouseOut="MM_swapImgRestore()"><img src="img/C-60-up.png" width="150px" alt="@60" id="@60"></a>
</center>
</div>
<div class="col-xs-6 col-sm-3" style="padding-bottom:20px;">
<center>
<a href="http://andrewalkerhair.com/" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('Andre Walker','','img/C-ANDRE-over.png',1)"><img src="img/C-ANDRE-UP.png" alt="Andre Walker Hair" width="150px" id="Andre Walker"></a>
</center>
</div>
<div class="col-xs-6 col-sm-3" style="padding-bottom:20px;">
<center>
<a href="https://www.domainecarneros.com/" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('Domaine Carneros','','img/C-domaie-over.png',1)"><img src="img/C-domaine-up.png" alt="Domaine Carneros by Taittinger" width="150px" id="Domaine Carneros"></a>
</center>
</div>
<div class="col-xs-6 col-sm-3" style="padding-bottom:20px;">
<center>
<a href="http://www.tomford.com/" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('Tom Ford','','img/C-ford-over.png',1)"><img src="img/C-ford-UP.png" alt="Tom Ford" width="150px" id="Tom Ford"></a>
</center>
</div>
</div>
<div class="row">
<div class="col-xs-6 col-sm-3" style="padding-bottom:20px;">
<center>
<a href="http://goodwillnynj.org/about-us" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('Goodwill','','img/C-Goodwill-over.png',1)"><img src="img/C-Goodwill-up.png" alt="Goodwill NYNJ" width="150px" id="Goodwill"></a>
</center>
</div>
<div class="col-xs-6 col-sm-3" style="padding-bottom:20px;">
<center>
<a href="http://simplygum.com/" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('Simply Gum','','img/C-gum-over.png',1)"><img src="img/C-gum-UP.png" alt="Simply Gum" width="150px" id="Simply Gum"></a>
</center>
</div>
<div class="col-xs-6 col-sm-3" style="padding-bottom:20px;">
<center>
<a href="http://www.hearst.com/about" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('Hearst','','img/C-hearst-over.png',1)"><img src="img/C-hearst-up.png" alt="Hearst" width="150" id="Hearst"></a>
</center>
</div>
<div class="col-xs-6 col-sm-3" style="padding-bottom:20px;">
<center>
<a href="http://bobmackie.com/pages/bobs-bio" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('Bob Mackie','','img/C-mackie-over.png',1)"><img src="img/C-mackie-up.png" alt="Bob Mackie" width="150" id="Bob Mackie"></a>
</center>
</div>
</div>
<div class="row">
<div class="col-xs-6 col-sm-3" style="padding-bottom:20px;">
<center>
<a href="http://erstwhilejewelry.com/" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('Erstwell','','img/C-erstwell-over.png',1)"><img src="img/C-erstwell-up.png" alt="Erstwell Jewelry" width="200" id="Erstwell"></a>
</center>
</div>
<div class="col-xs-6 col-sm-3" style="padding-bottom:20px;">
<center>
<a href="http://www.taittinger.fr/" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('Taittinger','','img/C-Taittinger-over.png',1)"><img src="img/C-Taittinger-UP.png" alt="Taittinger" width="150" id="Taittinger"></a>
</center>
</div>
<div class="col-xs-6 col-sm-3" style="padding-bottom:20px;">
<center>
<a href="https://www.youtube.com/watch?v=PRzh7hhsk84" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('WIE Network','','img/C-wie-over.png',1)"><img src="img/C-wie-up.png" alt="WIE Network" width="150" id="WIE Network"></a>
</center>
</div>
<div class="col-xs-6 col-sm-3" style="padding-bottom:20px;">
<center>
<a href="http://candicekumai.com/about" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('Candice','','img/C-candice-over.png',1)"><img src="img/C-candice-up.png" alt="Candice Kumai" width="150" id="Candice"></a>
</center>
</div>
</div>
<div class="row">
<div class="col-xs-6 col-sm-3" style="padding-bottom:20px;">
<center>
<a href="https://www.delivery.com/info/about" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('com','','img/C-Delivery-over.png',1)">
<img src="img/C-Delivery-up.png" alt="Delivery.com" width="150" id="Delivery.com"></a>
</center>
</div>
<div class="col-xs-6 col-sm-3" style="padding-bottom:20px;">
<center>
<a href="http://kettlebellkickboxing.com/" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('Kettlebell Kickboxing','','img/C-kettle-over.png',1)"><img src="img/C-kettle-UP.png" alt="Kettlebell Kickboxing" width="150" id="Kettlebell Kickboxing"></a>
</center>
</div>
<div class="col-xs-6 col-sm-3" style="padding-bottom:20px;">
<center>
<a href="http://www.nelsonvercher.com/" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('Nelson','','img/C-nelson-over.png',1)"><img src="img/C-nelson-up.png" alt="Nelson Verner" width="150" id="Nelson"></a>
</center>
</div>
<div class="col-xs-6 col-sm-3" style="padding-bottom:20px;">
<center>
<a href="https://www.mentedcosmetics.com/" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('Mented','','img/C-Mented-over.png',1)"><img src="img/C-Mented-up.png" alt="Mented" width="150" id="Mented"></a>
</center>
</div>
</div>
<div class="row">
<div class="col-xs-6 col-sm-3">
<center>
<a href="http://shortyawards.com/socialgood" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('Shorty Social Good Awards','','img/C-ShortyGood-over.png',1)"><img src="img/C-ShortyGood-up.png" alt="Shorty Social Good Awards" width="150" id="Shorty Social Good"></a>
</center>
</div>
<div class="col-xs-6 col-sm-3">
<center>
<a href="https://www.youtube.com/watch?time_continue=1&v=lIKzgXJxBU8" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('Shorty Awards','','img/C-shorty-over.png',1)"><img src="img/C-shorty-up.png" alt="Shorty Awards" width="150" id="Shorty Awards"></a>
</center>
</div>
<div class="col-xs-6 col-sm-3">
<center>
<a href="http://waxclub.nyc/" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('Wax Club','','img/C-WaxClub-over.png',1)"><img src="img/C-WaxClub-up.png" alt="Wax Club" width="150" id="Wax Club"></a>
</center>
</div>
<div class="col-xs-6 col-sm-3"></div>
</div>
</div>
请注意，如果填充元素不足，您可以为next提供默认值：
答案 1 :(得分：3)
尝试类似：
<form>
<fields name="params">
<fieldset name="basic" label="Color settings">
<field
name = "eventcolor"
type = "color"
default = "frontpage"
validate = "color"
class="input-colorpicker"
value="#000"
size="10"
label = "Kleur"
required = "true"
description = "Kies een event kleur"
</field>
</fieldset>
</fields>
</form>请注意，这会从[x if x else list2.pop(0) for x in list1]
删除项目。
答案 2 :(得分：1)
你可以试试这个：
list1 = [1, 0, 1, 0, 1, 0]
list2 = [1, 2, 3]
it2 = iter(list2)
[x if x != 0 else next(it2) for x in list1]
# [1, 1, 1, 2, 1, 3]
输出：
list1 = [1,0,1,0,1,0]
list2 = [1,2,3]
new_list = [list2[list1[:i].count(a)] if a != 1 else a for i, a in enumerate(list1)]
答案 3 :(得分：1)
如果您想使用map()，可以试试这个：
from collections import deque
list1 = [1,0,1,0,1,0]
list2 = [1,2,3]
queue = deque(list2)
result = list(map(lambda x : x if x else queue.popleft(), list1))
print(result)
哪个输出：
[1, 1, 1, 2, 1, 3]
注意：我使用了堆栈/队列数据结构collections.deque来允许从前面O(1) popleft()，而不是使用pop(0) }，这是O(n)。如果您不想使用此库，则可以事先撤消list2，然后拨打pop()，这也是O(1)。