vectorsum.py#!/usr/bin/env/pythonimport sysfrom datetime import datetimeimport numpy as np # def numpysum(n):# a = np.arange(n) ** 2# b = np.arange(n) ** 3# c = a + b# return c def pythonsum(n): a = range(n) b = range(n) c = [] for i in range(len(a))…
TypeError: 'range' object does not support item assignment I was looking at some python 2.x code and attempted to translate it to py 3.x but I'm stuck on this section. Could anyone clarify what is wrong? import random emails = { "x": "[REDA…
贴问题 nums = range(5)#range is a built-in function that creates a list of integers print(nums)#prints "[0,1,2,3,4]" print(nums[2:4])#Get a slice from index 2 to 4 (exclusive); prints '[2,3]" print(nums[2:])#Get a slice from index 2 to the end…
Python中想修改字符串的最后一个字符,使用name[-1] = 'e'来实现,运行后报错. 报错内容是:TypeError: 'str' object does not support item assignment 分析错误内容:不支持字符串的修改 总结:字符串一旦创建之后,里面的元素是不可以修改的.但是重新赋值是可以的,例如:name = 'xiaobai'.…
