blocks|key|3705191|text|这样就可以了|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3705192|import+pylab+as+plot
params+=+{'legend.fontsize':+20,
++++++++++'legend.handlelength':+2}
plot.rcParams.update(params)|code-block|syntax|javascript|3705193|然后再做剧情。|3705194|还有很多其他的rcParams，它们也可以在matplotlibrc文件中设置。|3705195|另外，假设你可以通过一个matplotlib.font_manager.FontProperties实例来改变它，但是我不知道该怎么做。-->查看Yann的答案。|offset|length|style|CODE|3705196|entityMap^0|0|0|0|0|C|12|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|V|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|W|8|@$M|X|N|Y|O|P]]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

This should do

<pre><code>import pylab as plot
params = {'legend.fontsize': 20,
 'legend.handlelength': 2}
plot.rcParams.update(params)
</code></pre>

Then do the plot afterwards.

There are a ton of other rcParams, they can also be set in the matplotlibrc file.

Also presumably you can change it passing a <code>matplotlib.font_manager.FontProperties</code> instance but this I don't know how to do. --> see Yann's answer.

blocks|key|277737|text|您可以通过调整prop关键字来设置图例的单个字体大小。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|277738|plot.legend(loc=2,+prop={'size':+6})|code-block|syntax|javascript|277739|这需要一个与matplotlib.font_manager.FontProperties属性相对应的关键字字典。请参阅documentation+for+legend|277740|277741|关键字参数：|blockquote|277742|277743|prop:+None+%7C+FontProperties+%7C+dict一个matplotlib.font_manager.FontProperties实例。如果prop是一个字典，将使用prop创建一个新实例。如果没有，请使用rc设置。|277744|277745|从1.2.1版本开始，也可以使用关键字fontsize。|277746|entityMap|0|LINK|mutability|MUTABLE|url|http://matplotlib.sourceforge.net/api/pyplot_api.html#matplotlib.pyplot.legend|1|http://matplotlib.org/api/legend_api.html#matplotlib.legend.Legend^0|7|4|0|0|6|12|1N|O|0|0|0|0|0|0|0|J|8|1|5|1|0^^$0|@$1|2|3|4|5|6|7|16|8|@$9|17|A|18|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|19|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|1A|8|@$9|1B|A|1C|B|C]]|D|@$9|1D|A|1E|1|1F]]|E|$]]|$1|M|3|-4|5|6|7|1G|8|@]|D|@]|E|$]]|$1|N|3|O|5|P|7|1H|8|@]|D|@]|E|$]]|$1|Q|3|-4|5|6|7|1I|8|@]|D|@]|E|$]]|$1|R|3|S|5|6|7|1J|8|@]|D|@]|E|$]]|$1|T|3|-4|5|6|7|1K|8|@]|D|@]|E|$]]|$1|U|3|V|5|6|7|1L|8|@$9|1M|A|1N|B|C]]|D|@$9|1O|A|1P|1|1Q]]|E|$]]|$1|W|3|-4|5|6|7|1R|8|@]|D|@]|E|$]]]|X|$Y|$5|Z|10|11|E|$12|13]]|14|$5|Z|10|11|E|$12|15]]]]

You can set an individual font size for the legend by adjusting the <code>prop</code> keyword. 

<pre><code>plot.legend(loc=2, prop={'size': 6})
</code></pre>

This takes a dictionary of keywords corresponding to <code>matplotlib.font_manager.FontProperties</code> properties. See the <a href="http://matplotlib.sourceforge.net/api/pyplot_api.html#matplotlib.pyplot.legend" rel="noreferrer">documentation for legend</a>:

<blockquote>
 Keyword arguments:

<pre><code>prop: [ None | FontProperties | dict ]
 A matplotlib.font_manager.FontProperties instance. If prop is a 
 dictionary, a new instance will be created with prop. If None, use
 rc settings.
</code></pre>
</blockquote>

It is also possible, as of version <a href="http://matplotlib.org/api/legend_api.html#matplotlib.legend.Legend" rel="noreferrer">1.2.1</a>, to use the keyword <code>fontsize</code>.

blocks|key|3705276|text|在我的安装中，FontProperties只更改文本大小，但它仍然太大且间距太大。我在pyplot.rcParams中找到了一个参数：legend.labelspacing，我猜它被设置为字体大小的一小部分。我用以下命令更改了它|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3705277|pyplot.rcParams.update({'legend.labelspacing':0.25})|code-block|syntax|javascript|3705278|我不确定如何将其指定给pyplot.legend函数传递|3705279|prop={'labelspacing':0.25}|3705280|或|3705281|prop={'legend.labelspacing':0.25}|3705282|返回一个错误。|3705283|entityMap^0|17|F|1V|J|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]|$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|11|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|12|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|13|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|14|8|@]|D|@]|E|$]]|$1|Q|3|R|5|H|7|15|8|@]|D|@]|E|$I|J]]|$1|S|3|T|5|6|7|16|8|@]|D|@]|E|$]]|$1|U|3|-4|5|6|7|17|8|@]|D|@]|E|$]]]|V|$]]

On my install, FontProperties only changes the text size, but it's still too large and spaced out. I found a parameter in <code>pyplot.rcParams</code>: <code>legend.labelspacing</code>, which I'm guessing is set to a fraction of the font size. I've changed it with

<pre><code>pyplot.rcParams.update({'legend.labelspacing':0.25})
</code></pre>

I'm not sure how to specify it to the pyplot.legend function - passing

<pre><code>prop={'labelspacing':0.25}
</code></pre>

or

<pre><code>prop={'legend.labelspacing':0.25}
</code></pre>

comes back with an error.

blocks|key|3990689|text|有多个用于调整图例大小的设置。我发现最有用的两个是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3990690|3990691|标签间距:以字体大小的倍数设置标签条目之间的间距。例如，对于10磅的字体，legend(...,+labelspacing=0.2)会将条目之间的间距减少到2磅。我安装的默认字体是0.5。|unordered-list-item|offset|length|style|CODE|3990692|prop:它允许完全控制字体大小等。你可以使用legend(...,+prop={'size':8})设置8磅字体。我安装的默认大小约为14点。|3990693|3990694|此外，legend+documentation还列出了许多其他填充和间距参数，包括：borderpad、handlelength、handletextpad、borderaxespad和columnspacing。所有这些都遵循与标签间距和面积相同的形式，也是字体大小的倍数。|3990695|也可以使用matplotlibrc+file将这些值设置为所有图形的默认值。|3990696|entityMap|0|LINK|mutability|MUTABLE|url|http://matplotlib.sourceforge.net/api/pyplot_api.html#matplotlib.pyplot.legend|1|http://matplotlib.sourceforge.net/users/customizing.html^0|0|0|11|T|0|N|S|0|0|16|9|1G|C|1T|D|27|D|2L|D|3|K|0|0|5|H|1|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|11|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|12|8|@$F|13|G|14|H|I]]|9|@]|A|$]]|$1|J|3|K|5|E|7|15|8|@$F|16|G|17|H|I]]|9|@]|A|$]]|$1|L|3|-4|5|6|7|18|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|19|8|@$F|1A|G|1B|H|I]|$F|1C|G|1D|H|I]|$F|1E|G|1F|H|I]|$F|1G|G|1H|H|I]|$F|1I|G|1J|H|I]]|9|@$F|1K|G|1L|1|1M]]|A|$]]|$1|O|3|P|5|6|7|1N|8|@]|9|@$F|1O|G|1P|1|1Q]]|A|$]]|$1|Q|3|-4|5|6|7|1R|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]|Y|$5|T|U|V|A|$W|Z]]]]

There are multiple settings for adjusting the legend size. The two I find most useful are:

<ul>
<li>labelspacing: which sets the spacing between label entries in multiples of the font size. For instance with a 10 point font, <code>legend(..., labelspacing=0.2)</code> will reduce the spacing between entries to 2 points. The default on my install is about 0.5.</li>
<li>prop: which allows full control of the font size, etc. You can set an 8 point font using <code>legend(..., prop={'size':8})</code>. The default on my install is about 14 points.</li>
</ul>

In addition, the <a href="http://matplotlib.sourceforge.net/api/pyplot_api.html#matplotlib.pyplot.legend" rel="noreferrer">legend documentation</a> lists a number of other padding and spacing parameters including: <code>borderpad</code>, <code>handlelength</code>, <code>handletextpad</code>, <code>borderaxespad</code>, and <code>columnspacing</code>. These all follow the same form as labelspacing and area also in multiples of fontsize.

These values can also be set as the defaults for all figures using the <a href="http://matplotlib.sourceforge.net/users/customizing.html" rel="noreferrer">matplotlibrc file</a>.

blocks|key|2091823|text|除了以点为单位的大小之外，还有一些命名为fontsizes的文件：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2091824|xx-small
x-small
small
medium
large
x-large
xx-large|code-block|syntax|javascript|2091825|用法：|2091826|pyplot.legend(loc=2,+fontsize+=+'x-small')|2091827|entityMap|0|LINK|mutability|MUTABLE|url|http://matplotlib.org/api/text_api.html#matplotlib.text.Text.set_size^0|K|9|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|Z|8|@]|9|@]|C|$]]|$1|K|3|L|5|F|7|10|8|@]|9|@]|C|$G|H]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]]]

There are also a few named <a href="http://matplotlib.org/api/text_api.html#matplotlib.text.Text.set_size">fontsizes</a>, apart from the size in points:

<pre><code>xx-small
x-small
small
medium
large
x-large
xx-large
</code></pre>

Usage:

<pre><code>pyplot.legend(loc=2, fontsize = 'x-small')
</code></pre>

blocks|key|3990770|text|使用import+matplotlib.pyplot+as+plt|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3990771|图例方法1:调用(重复)时指定字体大小|BOLD|3990772|plt.legend(fontsize=20)+#+using+a+size+in+points
plt.legend(fontsize="x-large")+#+using+a+named+size|code-block|syntax|javascript|3990773|使用此方法，您可以在创建时为每个图例设置字体大小(允许您拥有多个具有不同字体大小的图例)。但是，每次创建图例时，您都必须手动键入所有内容。|3990774|(注：@Mathias711在他的答案中列出了可用的命名字体大小)|3990775|方法2:在rcParams+(便捷)中指定字体大小|3990776|plt.rc('legend',fontsize=20)+#+using+a+size+in+points
plt.rc('legend',fontsize='medium')+#+using+a+named+size|3990777|使用此方法设置默认图例字体大小，所有图例将自动使用该字号，除非您使用方法1另行指定。这意味着您可以在代码开头设置图例字体大小，而不必担心为每个单独的图例设置它。|3990778|如果使用命名大小，例如'medium'，则图例文本将随rcParams中的全局font.size缩放。要更改font.size，请使用plt.rc(font.size='medium')|3990779|entityMap^0|2|V|0|8|4|0|0|0|0|0|I|0|0|0|B|8|R|8|13|9|1I|9|1V|Q|0^^$0|@$1|2|3|4|5|6|7|11|8|@$9|12|A|13|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|14|8|@$9|15|A|16|B|H]]|D|@]|E|$]]|$1|I|3|J|5|K|7|17|8|@]|D|@]|E|$L|M]]|$1|N|3|O|5|6|7|18|8|@]|D|@]|E|$]]|$1|P|3|Q|5|6|7|19|8|@]|D|@]|E|$]]|$1|R|3|S|5|6|7|1A|8|@$9|1B|A|1C|B|H]]|D|@]|E|$]]|$1|T|3|U|5|K|7|1D|8|@]|D|@]|E|$L|M]]|$1|V|3|W|5|6|7|1E|8|@]|D|@]|E|$]]|$1|X|3|Y|5|6|7|1F|8|@$9|1G|A|1H|B|C]|$9|1I|A|1J|B|C]|$9|1K|A|1L|B|C]|$9|1M|A|1N|B|C]|$9|1O|A|1P|B|C]]|D|@]|E|$]]|$1|Z|3|-4|5|6|7|1Q|8|@]|D|@]|E|$]]]|10|$]]

using <code>import matplotlib.pyplot as plt</code>

Method 1: specify the fontsize when calling legend (repetitive)

<pre><code>plt.legend(fontsize=20) # using a size in points
plt.legend(fontsize="x-large") # using a named size
</code></pre>

With this method you can set the fontsize for each legend at creation (allowing you to have multiple legends with different fontsizes). However, you will have to type everything manually each time you create a legend. 

(Note: @Mathias711 listed the available named fontsizes in his answer)

Method 2: specify the fontsize in rcParams (convenient)

<pre><code>plt.rc('legend',fontsize=20) # using a size in points
plt.rc('legend',fontsize='medium') # using a named size
</code></pre>

With this method you set the default legend fontsize, and all legends will automatically use that unless you specify otherwise using method 1. This means you can set your legend fontsize at the beginning of your code, and not worry about setting it for each individual legend. 

If you use a named size e.g. <code>'medium'</code>, then the legend text will scale with the global <code>font.size</code> in <code>rcParams</code>. To change <code>font.size</code> use <code>plt.rc(font.size='medium')</code>

blocks|key|277282|text|字体(loc=‘右下角’，decimal_places+=+2，plot.legend=+'11'，title+=‘嘿’，title_fontsize+=+'20')|type|unstyled|depth|inlineStyleRanges|entityRanges|data|277283|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

plot.legend(loc = 'lower right', decimal_places = 2, fontsize = '11', title = 'Hey there', title_fontsize = '20')

blocks|key|3705430|text|现在，在2021年，通过matplotlib+3.4.2，您可以使用以下内容设置图例字体|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3705431|plt.legend(title="My+Title",+fontsize=10,+title_fontsize=15)|code-block|syntax|javascript|3705432|其中，fontsize是图例中项目的字体大小，title_fontsize是图例标题的字体大小。有关更多信息，请访问matplotlib+documentation|offset|length|style|CODE|3705433|entityMap|0|LINK|mutability|MUTABLE|url|https://matplotlib.org/stable/api/_as_gen/matplotlib.pyplot.legend.html^0|0|0|3|8|N|E|1M|O|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@$I|X|J|Y|K|L]|$I|Z|J|10|K|L]]|9|@$I|11|J|12|1|13]]|A|$]]|$1|M|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

Now in 2021, with matplotlib 3.4.2 you can set your legend fonts with
<pre><code>plt.legend(title=&quot;My Title&quot;, fontsize=10, title_fontsize=15)
</code></pre>
where <code>fontsize</code> is the font size of the items in legend and <code>title_fontsize</code> is the font size of the legend title. More information in <a href="https://matplotlib.org/stable/api/_as_gen/matplotlib.pyplot.legend.html" rel="noreferrer">matplotlib documentation</a>

blocks|key|2091924|text|您可以减小图例大小设置：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2091925|plt.legend(labelspacing=y,+handletextpad=x,fontsize)++|code-block|syntax|javascript|2091926|2091927|标签间距是每个标签之间的垂直间距。|blockquote|2091928|2091929|handletextpad是实际图例和标签之间的距离。|2091930|fontsize是自解释的|2091931|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|S|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|T|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|U|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|V|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|W|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|X|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|Q|$]]

you can reduce the legend size setting:
<pre><code>plt.legend(labelspacing=y, handletextpad=x,fontsize) 
</code></pre>
<blockquote>
labelspacing is the vertical space between each label.
handletextpad is the distance between the actual legend and your
label.
And fontsize is self-explanatory
</blockquote>

Simple question here: I'm trying to get the size of my legend using <code>matplotlib.pyplot</code> to be smaller (i.e., the text to be smaller). The code I'm using goes something like this:

<pre><code>plot.figure()
plot.scatter(k, sum_cf, color='black', label='Sum of Cause Fractions')
plot.scatter(k, data[:, 0], color='b', label='Dis 1: cf = .6, var = .2')
plot.scatter(k, data[:, 1], color='r', label='Dis 2: cf = .2, var = .1')
plot.scatter(k, data[:, 2], color='g', label='Dis 3: cf = .1, var = .01')
plot.legend(loc=2)
</code></pre>

How to change legend size with matplotlib.pyplot

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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这里有一个简单的问题:我正在尝试使用matplotlib.pyplot使我的图例的大小变小(即文本变小)。我使用的代码是这样的：plot.figure()plot.scatter(k, sum_cf, color='black', label='Sum of Cause Fractions')plot.scatter(...

问如何使用matplotlib.pyplot更改图例大小
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问如何使用matplotlib.pyplot更改图例大小EN