name 'dashdot' is not defined怎样解决

用plotnine复现ggplot2绘制出来的图
NameError: name 'dashdot' is not defined

import pandas as pd
import patchworklib as pw 
from plotnine import *
from plotnine.data import *  
dat=pd.read_excel("Fig E3 Source Data.xlsx", sheet_name = "Metabolome")
FigE3a_metab =(ggplot(dat,aes(x='NEU', y='EOS')) +
  geom_point(size=2)+
  theme_bw()+ theme(panel_grid = element_blank()) +
  geom_hline(aes(yintercept = 0, linetype='dashdot')) +
  geom_hline(aes(yintercept = 1, linetype="dashed")) +
  geom_hline(aes(yintercept = -1, linetype="dashed")) +
  geom_vline(aes(xintercept = -1, linetype="dashed")) +
  geom_vline(aes(xintercept = 0, linetype='dashdot')) +
  geom_vline(aes(xintercept = 1, linetype="dashed")) +
  xlab("Correlation NEU: Directionality x - log(P)")+
  ylab("Correlation EOS: Directionality x - log(P)")+
  ggtitle("Differential MetaB modules"))
print(FigE3a_metab)

plotnine官网手册中linetype中短长虚线对应的就是dashdot，我不知道为什么会报错， 怎样修改才能运行出图片呢

这是因为 'dashdot' 不是 plotnine 中预定义的线型。在 plotnine 中，可用的线型是 'solid'，'dashed' 和 'dotted'。
你可以通过使用 'dotted' 或 'dashed' 来替代 'dashdot'。

更改代码如下：

geom_hline(aes(yintercept = 0, linetype='dotted')) +
geom_hline(aes(yintercept = 1, linetype="dashed")) +
geom_hline(aes(yintercept = -1, linetype="dashed")) +
geom_vline(aes(xintercept = -1, linetype="dashed")) +
geom_vline(aes(xintercept = 0, linetype='dotted')) +
geom_vline(aes(xintercept = 1, linetype="dashed"))

或者更改成

geom_hline(aes(yintercept = 0, linetype='dashed')) +
geom_hline(aes(yintercept = 1, linetype="dashed")) +
geom_hline(aes(yintercept = -1, linetype="dashed")) +
geom_vline(aes(xintercept = -1, linetype="dashed")) +
geom_vline(aes(xintercept = 0, linetype='dashed')) +
geom_vline(aes(xintercept = 1, linetype="dashed"))

再次运行代码,就可以得到你想要的图片了。