014day--python operators and job improvements

One, operator

% modulo, returns the remainder of the quotient

10/3 3.33333333335

10//3 3 floors Except, take integers, not rounded

A = 3 b = 5 -----> a<b and A==4 or b<10 and a>1

If the condition in front of or is set, then the formula after or is not followed, and the preceding formula is not considered, and the following is directly calculated.

' 123 '. IsDigit () determines whether a string can be converted to a number

Identity judgment:type (123) is int type (' 123 ') is STR

Bit operations:

128 64 32 16 8 4 2 1

a=60 0 0 1 1 1 1 0 0

B=13 0 0 0 0 1 1 0 1

& Bitwise vs . 0 0 0 0 1 1 0 0

| bitwise OR 0 0 1 1 1 1 0 1

second, the Operation

Level three menu (low version)

menu = {    'Beijing':{        'Haidian':{            'Five crossing':{                'Soho':{},                'NetEase':{},                'Google':{}            },            'Zhongguancun':{                'Iqiyi Art':{},                'Autohome':{},                'Youku':{},            },            'on the ground':{                'Baidu':{},            },        },        'changping':{            'Shahe':{                'old boy':{},                'Beihang University':{},            },            'Tin Tong Court':{},            'Huilongguan':{},        },        'Chaoyang':{},        'Dongcheng':{},    },    'Shanghai':{        'Minhang':{            "People's square":{                'Fried Chicken Shop':{}            }        },        'Zhabei':{            'Train Warfare':{                'Ctrip':{}            }        },        'Pudong':{},    },    'Shandong': {},}break_flag=True whileBreak_flag: forIinchMenu:Print(i) Choice1= Input (':'). Strip ()ifLen (Choice1) ==0:Continue    ifchoice1=='Q': Break_flag=FalseContinue    ifChoice1inchMenu: whileBreak_flag: forJinchMenu[choice1]:Print(j) Choice2= Input ('>>:'). Strip ()ifLen (CHOICE2) ==0:Continue            ifchoice2=='b': Break            ifchoice2=='Q': Break_flag=FalseContinue            ifChoice2inchMenu[choice1]: whileBreak_flag: forKinchMenu[choice1][choice2]:Print(k) Choice3= Input ('>>>:'). Strip ()ifLen (choice3) ==0:Continue                    ifchoice3=='b': Break                    ifchoice3=='Q': Break_flag=FalseContinue                    ifChoice3inchMenu[choice1][choice2]: whileBreak_flag: forMinchMenu[choice1][choice2][choice3]:Print(m) Choice4= Input ('>>>>:')                            ifLen (choice4) ==0:Continue                            ifchoice4=='b': Break                            ifchoice4=='Q': Break_flag=FalseContinue

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Shopping Cart optimization operations

Shopping_cart = {}#Shopping CartProduct_list = [                ['iphone', 5800],                ['Xiaomi Phone', 2000],                ['Maotai', 650],                ['Pen', 5],                ['Rice Cooker', 200]]salary= Int (Input ('Input Your Salary:')) whileTrue:index=0 forProductinchproduct_list:Print(index,product) Index+=1Choice= Input ('Please enter product number:')    ifchoice.isdigit (): Choice=int (choice)ifChoice>=0 andchoice<=Len (product_list): Product=Product_list[choice]ifPRODUCT[1] <=Salary:ifPRODUCT[0]inchshopping_cart:shopping_cart[product[1]]+=1Else: shopping_cart[product[0]]=[product[1],1] Salary-=product[1]                Print('The shopping cart has been added:'+product[0]+', your balance is:'+Str (salary))Else:                Print("salary is not enough, the price of the product is:%s, bad:%s"% (str (product[1]), product[1]-salary)) Else:            Print('number does not exist, please re-enter')    elifchoice=='Q':        Print('-----------you have purchased the following items-----------') Id_count= 1Total_cost=0Print('ID Product Unit Price quantity Total Price')         forKeyinchShopping_cart:Print("%s\t\t%s\t\t%s\t\t%s\t\t%s"%(Id_count, Key, Shopping_cart[key][0], shopping_cart[key][1], shopping_cart[key][0]*shopping_cart[key][1])) Id_count+=1Total_cost+=shopping_cart[key][0]*shopping_cart[key][1]        Print('your total cost is:%s'%total_cost)Print('your balance is:%s'%salary)Print('----------------End---------------')    Else:        Print('Number input Error')

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014day--python operators and job improvements