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from scipy import stats
import matplotlib.pyplot as plt
import numpy as np
y = []
for i in range(42):
y.append(1)
for i in range(42,45):
y.append(2)
for i in range(45,49):
y.append(3)
for i in range(49,52):
y.append(4)
for i in range(52,54):
y.append(5)
for i in range(54,58):
y.append(6)
for i in range(58,87):
y.append(7)
for i in range(87,100):
y.append(8)
plt.hist(y,bins=8,cumulative=True,density=1,histtype='step')
plt.xlim(0,8)
plt.ylim(0,1)
plt.grid(axis="y")
plt.title('数据单元累积分布函数')
plt.xlabel('数据单元个数')
plt.ylabel('概率')
plt.show()