~~~

a = ['dog', 'cat']b = ['cat']a.append(b)# ['dog', 'cat', ['snake']]a.extend(b)# ['dog', 'cat', ['snake'], 'snake']append是将b看作一个object相加extend 是list中的元素相加

第四课的课堂练习中有一个小例子：def add(x, y): return x+y def mult(x, y): print (x * y)add(1, 2)print(add(1, 2))mult(3, 4)print(mult(3, 4))题目问的是屏幕上会输出几行结果？显然，应该是4行.前三行为数值，最后一行是None.mult这个函数返回None，没有re...

# Problem Set 2, hangman.py# Name: # Collaborators:# Time spent:# Hangman Game# -----------------------------------# Helper code# You don't need to understand this helper code,# but you will...

bisection search有递归，无递归两种写法def achieve_down_payment(num, annual_salary, portion_down_payment): current_savings = 0 month =1 while ((current_savings - portion_down_payment) < (-100)):...

import mathannual_salary = int(input('Enter your annual salary:'))portion_salary = float(input('Enter the percent of your salary to save, as a decimal:'))total_cost = int(input('Enter the cost of y...

# House Hunting# total_cost: the cost of your dream home# portion_down_payment: 预付款 assume 0.25# current_savings: start with 0# r: annual return of investment current_savings*r/12# annual_salar...

Assignment:Write a program that does the following in order:Asks the user to enter a number “x”Asks the user to enter a number “y”Prints out number “x”, raised to the power “y”.Prints out the lo...