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a = 1.1b = 2.2r1 = b-aprint(r1)import decimaldecimal.getcontext().prec = 2a = decimal.Decimal('1.1')b = decimal.Decimal('2.2')r2 = b-aprint(r2)a = float(a)b = float(b)r3 = b-aprint(r3)print(r1==r2,r1==r3,r2==r3)decimal.getcontext().prec =

自定义类型IntervalMath的实例a，求a/2可以进入类的内置函数__truediv__,而2/a进不去__rdiv__，只能在外面将2转化为IntervalMath类型。否则会报错：TypeError: unsupported operand type(s) for /: ‘int’ and 'IntervalMath’但a/2时就不会报错。# -*- coding: utf-8 -*-"""Created on Wed Mar 9 21:10:37 2022@author: REE

当在代码中同时import numpy库和math库时，在进行sin、exp等运算时需要使用 np.exp()或者 np.sin()，否则就会报这个错误。# -*- coding: utf-8 -*-"""Created on Wed Mar 9 19:45:00 2022@author: REESE"""from math import *import numpy as npdef f(x): return np.exp(-x**2)*np.sin(10*x)def trap

DataFrame数据读取读取具体单元格值方法一 df[‘ColName’][行号]方法二 df.values[1][1]df.values 去掉行名、列名只剩下数组构成的数组 ‘numpy.ndarray’可用df.values[行号]取出整行数据用df.values[行号][列号]取出单个数据读取一列df[‘ColName’]读取多列df[[‘ColName1’,‘ColN...

1.报错：UnicodeDecodeError: 'utf-8' codec can't decode byte 0xce in position 0: invalid continuation byte在pandas.read_csv()的参数中加encoding="gbk"即可2.报错:找不到路径pd.read_csv(r"C:\Users\REESE\Desktop\a.csv")...

方法一A = ['A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z']a = input()for i in a: if i in A: b = A[(ord(i) - ord('A') + 3) % 26] ...

方法一 字符串转化成列表，赋值后，再连接成字符串NumStr = input()NumList = list(NumStr)for i in range(0,len(NumStr)):#最后一个字符的下标是长度-1 switch(eval(NumList[i])) { case(0): eval(NumList[i]) =...