是否可以在单杠之间放置`plt.yticks`? [英] Is it possible to put the `plt.yticks` between the horizontal bars?

问题描述

我正在尝试将值放在两个小节之间的plt.yticks中.不幸的是，我不知道该怎么做.有可能吗?如果有人可以给一些提示?

I'm trying to put the value in the plt.yticks between the bars. Unfortunately, I have no idea how to do it. Is it possible?, if it is can anyone give some tips?

import pandas as pd
import numpy as np
import matplotlib.pyplot as plt

age = np.array(
    ["0 - 4", "5 - 9", "10 - 14", "15 - 19", "20 - 24", "25 - 29", "30 - 34", "35 - 39",
     "40 - 44", "45 - 49", "50 - 54", "55 - 59", "60 - 64", "65 - 69", "70 - 74",
     "75 - 79", "80 - 84", "85 - 89", "90 - 94", "95 - 99", "> 100"])
m = np.array(
    [1915887, 2100931, 2494484, 2464805, 2361297, 2529633, 2669927, 2754129, 2753282,
     2552531, 2211649, 1697221, 1311024, 902675, 722246, 482686, 273915, 108639, 35867,
     10965, 1238])
f = np.array(
    [1823981, 1980712, 2369795, 2435784, 2330223, 2562964, 2724990, 2860720, 2918730,
     2713534, 2376384, 1869867, 1454373, 1030677, 885393, 640698, 388748, 172302, 64170,
     19868, 2711])
x = np.arange(age.size)
tick_lab = ['3M', '2M', '1M', '1M', '2M', '3M']
tick_val = [-3000000, -2000000, -1000000, 1000000, 2000000, 3000000]


def plot_pyramid():
    plt.barh(x, -m, alpha=.75, height=.75, align='center' , color="deepskyblue")
    plt.barh(x, f, alpha=.75, height=.75, align='center', color="pink")
    plt.yticks(x, age)
    plt.xticks(tick_val, tick_lab)
    plt.grid(b=False)
    plt.title("Population Pyramid")
    plt.show()


if __name__ == '__main__':
    plot_pyramid()

此代码生成的图表

推荐答案

我只是将下面的两行替换为plt.barh行，并在函数内部的plt.title之后添加了for循环，并用ax.set_yticks(False) >.我不确定这是否正是您想要的.

I just replaced the two plt.barh lines by the below lines and added the for loop after plt.title inside the function and replaced ax.set_yticks(False) by plt.yticks([]). I am not sure if this is exactly what you want.

# Modified before the function because you are shifting the bars left/right
tick_val = np.array([-3000000, -2000000, -1000000, 1000000, 2000000, 3000000])
shift = 300000
tick_val[0:3] -= shift
tick_val[3:] += shift

# Modified inside the function
plt.barh(x, -m, alpha=.75, height=.75, left=-shift, align='center' , color="deepskyblue")
plt.barh(x, f, alpha=.75, height=.75, left = shift, align='center', color="pink")

for i, j in enumerate(age):
    if i==0 or i==1:
        plt.text(-150000, x[i]-0.2, j, fontsize=10)
    else:    
        plt.text(-230000, x[i]-0.2, j, fontsize=10)

输出

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