import matplotlib.pyplot as plt
from textwrap import wrap
x_list = [11, 3, 6, 5]
label_list = ["red colour", "blue colour", "green colour", "back colour"]
title = "Some really really long long long title I really really need - and just can't - just can't - make it any - simply any - shorter - at all?"
newtitle = '\n'.join(wrap(title, width=50)) # wrap the long title so that it won't get cropped.
# here if I print `newtitle` first then "text below the main title" gets convert into italics
newtitle = "%s\n$%s$"%(newtitle, 'text\ below\ the\ main\ title')
# but If I print `newtitle` after the secondary text it doesn't convert into italics
newtitle = "%s\n$%s$"%('text\ below\ the\ main\ title', newtitle) # comment this line for 1st effect
plt.figure(figsize=(7,6), dpi=100)
plt.axis("equal")
plt.subplots_adjust(left=0.1, right=0.8, top=0.7)
plt.rc("font", size=10)
explode = [0.03, 0, 0, 0]
plt.pie(x_list, labels=label_list, explode=explode, autopct="%1.1f%%", startangle=90)
plt.title(newtitle, size=12)
plt.savefig('test.png')
所以我的主要问题是-
次要文本首先以普通字体出现，然后是主要标题（
newtitle），之后是斜体/浅色字体（看起来很漂亮）。newtitle = "%s\n$%s$"%('text\ below\ the\ main\ title', newtitle)我们可以不使用
$符号就能做到吗？ 最佳答案
这是预期的结果吗？
可以使用mathtext快速而肮脏的方式完成此操作，但是必须使$剥落每行，例如：
newtitle = '\n'.join(['$%s$'%item for item in wrap(title, width=50)]).replace(' ', '\ ')
newtitle = "%s\n%s"%('text\ below\ the\ main\ title', newtitle)
但是我认为更好的方法是将这两个标题分开。您可以使用
suptitle作为上一行，或者可以仅使用text，然后分别控制其属性。例如。：plt.pie(x_list, labels=label_list, explode=explode, autopct="%1.1f%%", startangle=90)
plt.title('\n'.join(wrap(title, width=50)), size=12, style='italic')
plt.suptitle('some title', y=0.85, x=0.45) #y and x needed as you have adjusted the subplot size already.