Python 数据分析练习1
环境
Anaconda3 Python 3.6, Window 64bit
- 目的
从MySQL数据库读取数据,进行数据清理,数据展示
- 代码
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
# -*- coding: utf-8 -*- import pymysql import pandas as pd import matplotlib.pylab as mtp import numpy as np # 数据库连接 db_conn = pymysql.connect( host="***", user="kimbo", passwd="***", database="kimbo_test", port=3306, charset="utf8" ) # 执行sql语句 sql_cmd = "select id,order_id,valid_amt,coll_amt,product_type,one_dept from kimbo_test;" # 导入数据 data1 = pd.read_sql(sql_cmd, db_conn) # 数据清洗,发现缺失值 c = 0 data2 = data1.values # 转换成DateFrame模式 rows = len(data2) # 行数 cols = len(data2[0]) # 列数 # print(data2) print(rows, cols) for i in range(rows): for j in range(cols): if (data2[i][j] == "NULL"): data2[i][j] = None if (data2[i][2] >= 1000): data2[i][2] -= 100 c += 1 print("总共修改数值:%d" % c) data3 = data2.T # 行列转换 price = data3[2] # 价格 amt = data3[3] # 金额 pricemax = data3[2].max() pricemin = data3[2].min() amtmax = data3[3].max() amtmin = data3[3].min() # 极差 最大值-最小值 pricediff = pricemax - pricemin amtdiff = amtmax - amtmin # 组距 极差/组数 pricedst = pricediff / 7 amtdst = amtdiff / 7 # 根据组距 切分 pricesty = np.arange(pricemin, pricemax, pricedst) amtsty = np.arange(amtmin, amtmax, amtdst) # 散点图 mtp.subplot(2, 1, 1) mtp.plot(price, amt, 'o') mtp.title("ctp") # 画价格的直方图 mtp.subplot(2, 2, 3) mtp.hist(data3[2], pricesty, color='y') mtp.title("pri") # 画金额的直方图 mtp.subplot(2, 2, 4) mtp.hist(data3[3], amtsty, color='b') mtp.title("amt") mtp.show()
- 结果展示
-------> by kimbo_zhang