python绘制简单直方图的方法

'''
    组数=极差/组距
'''
from matplotlib import pyplot as plt
from matplotlib import font_manager
import random
 
a = [random.randint(80,140) for i in range(250)]
print(a)
print(max(a)-min(a))
 
# 计算组数
d = 3  # 组距
num_bins = (max(a)-min(a))//d
 
# 设置图形大小
plt.figure(figsize=(20, 8), dpi=80)
plt.hist(a, num_bins)
 
# 设置x轴刻度
plt.xticks(range(min(a), max(a)+d, d))
 
# 设置网格
plt.grid(alpha=0.4)
plt.show()

'''
    组数=极差/组距
'''
from matplotlib import pyplot as plt
from matplotlib import font_manager
import random
 
a = [random.randint(80,140) for i in range(250)]
print(a)
print(max(a)-min(a))
 
# 计算组数
d = 3  # 组数
num_bins = (max(a)-min(a))//d
 
# 设置图形大小
plt.figure(figsize=(20,8),dpi=80)
plt.hist(a,num_bins,density=True)  # 使用density实现频率化
 
# 设置x轴刻度
plt.xticks(range(min(a),max(a)+d,d))
 
# 设置网格
plt.grid(alpha=0.4)
plt.show()

# coding=utf-8
from matplotlib import pyplot as plt
from matplotlib import font_manager
 
interval = [0,5,10,15,20,25,30,35,40,45,60,90,150]
width = [5,5,5,5,5,5,5,5,5,15,30,60]
quantity = [836,2737,3723,3926,3596,1438,3273,642,824,613,215,47]
 
plt.figure(figsize=(20,8),dpi=80)
 
plt.bar(range(len(quantity)),quantity,width=1)
 
# 设置x轴刻度
_x = [i-0.5 for i in range(13)]
 
plt.xticks(_x, interval)
 
plt.grid(alpha=0.8)
plt.show()