示例：
>>>for x in iterable1:
... expression
地图表格将是：
>>>map(lambda x:expression,iterable1)
如何将此扩展为嵌套？
示例：
>>>for x in itr1:
... for y in itr2:
... expr
不使用理解。
编辑：仅使用地图。
答案 0 :(得分：2)
您可以使用itertools.product构建两个嵌套序列的笛卡尔积，并将map表达式添加到2元组的列表中：
from itertools import product
map(lambda (x, y): expression, product(itr1, itr2))
一些实际值的示例：
seq = map(lambda (x, y): '%s:%s' % (x, y), product(itr1, itr2))
for item in seq:
print item
请注意，lambda (x, y)是将序列中的每个2元组解包到表达式中使用的单独x和y参数所必需的。
答案 1 :(得分：1)
请耐心等待。不是解释，但这在2天后起作用。仅使用地图和列表。这是糟糕的代码。欢迎提出缩短代码的建议。 Python 3解决方案
使用列表理解的示例：
>>> a=[x+y for x in [0,1,2] for y in [100,200,300]]
>>> a
[100,200,300,101,201,301,102,202,302]
使用示例：
>>>a=[]
>>>for x in [0,1,2]:
... for y in [100,200,300]:
... a.append(x+y)
...
>>>a
[100,200,300,101,201,301,102,202,302]
现在仅使用map：
的示例>>>n=[]
>>>list(map(lambda x:n.extend(map(x,[100,200,300])),map(lambda x:lambda y:x+y,[0,1,2])))
>>>n
[100,200,300,101,201,301,102,202,302]
更小的python2.7解决方案：
>>>m=[]
>>>map(lambda x:m.extend(x),map(lambda x:map(x,[100,200,300]),map(lambda x:lambda y:x+y,[0,1,2])))
>>>m
[100,200,300,101,201,301,102,202,302]
另一种变化：我通过电子邮件发送给Mark Lutz，这是他的解决方案。这不使用闭包，并且最接近嵌套for循环功能。
>>> X = [0, 1, 2]
>>> Y = [100, 200, 300]
>>> n = []
>>> t = list(map(lambda x: list(map(lambda y: n.append(x + y), Y)),X))
>>> n
[100,200,300,101,201,301,102,202,302]
答案 2 :(得分：0)
你不能。 lambda特别限于其返回值可以封装为单个表达式的函数：不允许使用语句。
您应该问自己的一个问题是，为什么您认为这是编写Python程序的理想方式？为了便于阅读，已明确定义了该语言，您应尽一切可能保持该可读性。
答案 3 :(得分：0)
Thnks lapin！
我有同样的问题，你给我解决方案：
很长的路：
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<div class="slide-content" data-slide="0">
<h2>Skygate (Night)</h2>
<a href="../downloads/Facebook/skygatenight1fbt.jpg" download>
<button class="btn btn-outline-dark btn-sm" type="button" style="margin-left: -1px;">Facebook Cover</button>
</a>
<div class="btn-group">
<div class="btn-group btn-group-sm">
<button type="button" class="btn btn-outline-dark btn-sm dropdown-toggle" data-toggle="dropdown">Desktop</button>
<div class="dropdown-menu" role="menu">
<a class="dropdown-item" href="../downloads/Desktop/1024x768" download>1024 x 768 (4:3)</a>
<a class="dropdown-item" href="../downloads/Desktop/1600x1200" download>1600 x 1200 (4:3)</a>
<a class="dropdown-item" href="../downloads/Desktop/1280x1024" download>1280 x 1024 (5:4)</a>
<a class="dropdown-item" href="../downloads/Desktop/1366x768" download>1366 x 768 (16:9)</a>
<a class="dropdown-item" href="../downloads/Desktop/1920x1080" download>1920 x 1080 (16:9)</a>
<a class="dropdown-item" href="../downloads/Desktop/1680x1050" download>1680 x 1050 (16:10)</a>
<a class="dropdown-item" href="../downloads/Desktop/1920x1200" download>1920 x 1200 (16:10)</a>
<a class="dropdown-item" href="../downloads/Desktop/2560x1600" download>2560 x 1600 (16:10)</a>
<a class="dropdown-item" href="../downloads/Desktop/2880x1800" download>2880 x 1800 (16:10)</a>
<a class="dropdown-item" href="../downloads/Desktop/3840x2160" download>3840 x 2160 (UHD 16:9)</a>
<a class="dropdown-item" href="../downloads/Desktop/4096x2304" download>4096 x 2304 (4K 16:9)</a>
<a class="dropdown-item" href="../downloads/Desktop/5120x2880" download>5120 x 2880 (5K 16:9)</a>
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<button type="button" class="btn btn-outline-dark btn-sm dropdown-toggle" data-toggle="dropdown">Mobile</button>
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<a class="dropdown-item" href="../downloads/Mobile/iPhone5" download>640 x 1136 (iphone 5)</a>
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<a class="dropdown-item" href="../downloads/Mobile/iPhone6+" download>1920 x 1920 (iphone 6+/7+)</a>
<a class="dropdown-item" href="../downloads/Mobile/HTC" download>1080 x 1920 (S4, HTC One)</a>
<a class="dropdown-item" href="../downloads/Mobile/iPad" download>1024 x 1024 (iPad 1&2/Mini)</a>
<a class="dropdown-item" href="../downloads/Mobile/Surface3" download>2160 x 1440 (Surface 3)</a>
<a class="dropdown-item" href="../downloads/Mobile/Retina" download>2048 x 2048 (Retina iPad/Mini)</a>
<a class="dropdown-item" href="../downloads/Mobile/GalaxyS6" download>2560 x 2560 (Galaxy S6)</a>
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<button type="button" class="btn btn-outline-dark btn-sm dropdown-toggle" data-toggle="dropdown">Dual</button>
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<a class="dropdown-item" href="../downloads/Dual/2560x1024" download>2560 x 1024</a>
<a class="dropdown-item" href="../downloads/Dual/3840x1080" download>3840 x 1080</a>
<a class="dropdown-item" href="../downloads/Dual/3360x1050" download>3360 x 1050</a>
<a class="dropdown-item" href="../downloads/Dual/3840x1200" download>3840 x 1200</a>
<a class="dropdown-item" href="../downloads/Dual/5120x1600" download>5120 x 1600</a>
<a class="dropdown-item" href="../downloads/Dual/8192x2304" download>8192 x 2304</a>
<a class="dropdown-item" href="../downloads/Dual/7680x2160" download>7680 x 2160</a>
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<a class="dropdown-item" href="../downloads/Triple/3840x1024" download>3840 x 1024</a>
<a class="dropdown-item" href="../downloads/Triple/5760x1080" download>5760 x 1080</a>
<a class="dropdown-item" href="../downloads/Triple/5040x1050" download>5040 x 1050</a>
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<a class="dropdown-item" href="../downloads/Triple/15360x2880" download>15360 x 2880</a>
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<h6 class="dropdown-header">Dual Screen</h6>
<a class="dropdown-item" href="../downloads/macOS/dual/2560x1024" download>2560 x 1024</a>
<a class="dropdown-item" href="../downloads/macOS/dual/3840x1080" download>3840 x 1080</a>
<a class="dropdown-item" href="../downloads/macOS/dual/3360x1050" download>3360 x 1050</a>
<a class="dropdown-item" href="../downloads/macOS/dual/3840x1200" download>3840 x 1200</a>
<a class="dropdown-item" href="../downloads/macOS/dual/5120x1600" download>5120 x 1600</a>
<a class="dropdown-item" href="../downloads/macOS/dual/8192x2304" download>8192 x 2304</a>
<a class="dropdown-item" href="../downloads/macOS/dual/7680x2160" download>7680 x 2160</a>
<a class="dropdown-item" href="../downloads/macOS/dual/10240x2880" download>10240 x 2880</a>
<h6 class="dropdown-header">Triple Screen</h6>
<a class="dropdown-item" href="../downloads/macOS/triple/3840x1024" download>3840 x 1024</a>
<a class="dropdown-item" href="../downloads/macOS/triple/5760x1080" download>5760 x 1080</a>
<a class="dropdown-item" href="../downloads/macOS/triple/5040x1050" download>5040 x 1050</a>
<a class="dropdown-item" href="../downloads/macOS/triple/5760x1200" download>5760 x 1200</a>
<a class="dropdown-item" href="../downloads/macOS/triple/7680x1600" download>7680 x 1600</a>
<a class="dropdown-item" href="../downloads/macOS/triple/12280x2304" download>11520 x 2160</a>
<a class="dropdown-item" href="../downloads/macOS/triple/12280x2304" download>12288 x 2304</a>
<a class="dropdown-item" href="../downloads/macOS/triple/15360x2880" download>15360 x 2880</a>
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<div class="container animated fadeIn" id="thumbnail-view" data-masonry='{ "itemSelector": ".grid-item", "columnWidth": 150 }'>
<div class="grid">
<div class="grid-item">
<a class="hexLink carousel-selector" data-slide="0">
<img width="150" height="97.5" class="img-thumbnail" src="http://via.placeholder.com/150x97">
</a>
</div>
</div>
</div>
</div>简短方法和解决方案：
SUITE = 'Heart Diamonds Spades Clubs'.split()
RANKS = '2 3 4 5 6 7 8 9 10 J Q K A'.split()
for x in RANKS:
for y in SUITE:
deck.append(x+" " +y)
print(deck)
print(len(deck))