python-3.x - 在 Matplotlib 中为 value_counts().plot 添加值文本
问题描述
给出如下代码:
import pandas as pd
import matplotlib.pyplot as plt
df = pd.DataFrame(['A','A','A','B','B','C'], columns = ['letters'])
df.value_counts()
df.letters.value_counts().sort_values().plot(kind = 'bar')
出去:
我想为每个条添加值文本,我怎么能在 Matplotlib 中做到这一点?谢谢。
更新的代码和数据集:
给定一个小数据集如下:
letters numbers
0 A 10
1 A 4
2 A 3
3 B 12
4 B 7
5 C 9
6 C 8
代码:
import pandas as pd
import matplotlib.pyplot as plt
bins = [0, 5, 10, 20]
df['binned'] = pd.cut(df['numbers'], bins = bins)
def addlabels(x, y):
for i in range(len(x)):
plt.text(i, y[i], y[i])
plt_df = df.binned.value_counts().sort_values()
plt.bar(plt_df.index, plt_df.values)
addlabels(plt_df.index, plt_df.values)
输出:
TypeError: float() argument must be a string or a number, not 'pandas._libs.interval.Interval'
解决方案
尝试:
import pandas as pd
import matplotlib.pyplot as plt
def addlabels(x,y):
for i in range(len(x)):
plt.text(i, y[i], y[i], ha = 'center')
df = pd.DataFrame(['A','A','A','B','B','C'], columns = ['letters'])
plt_df = df.letters.value_counts().sort_values()
plt.bar(plt_df.index, plt_df.values)
addlabels(plt_df.index, plt_df.values)