Python超级超级简易计算器4种写法

2417944015

虽然说是4种，其实深究的话都算是1种

第1种，数组切片方法，这个我昨天发过一次:

print("Python--简易计算器...")
circle=input("在右侧输入一个单次两项计算式子(例如1+2):")
circle_2=[]
for txt in circle:
    circle_2.append(txt)
for number in range(len(circle_2)):
    if circle_2[number]=="+":
        circle_3=circle_2[:number]
        circle_4=circle_2[number+1:]
        infront=''
        behind=''
        for number_2 in range(number):
            infront=infront+circle_3[number_2]
        for number_2 in range(len(circle_2)-number-1):
            behind=behind+circle_4[number_2]
        print(infront+"+"+behind+"="+str(float(infront)+float(behind)))
    if circle_2[number]=="-":
        circle_3=circle_2[:number]
        circle_4=circle_2[number+1:]
        infront=''
        behind=''
        for number_2 in range(number):
            infront=infront+circle_3[number_2]
        for number_2 in range(len(circle_2)-number-1):
            behind=behind+circle_4[number_2]
        print(infront+"-"+behind+"="+str(float(infront)-float(behind)))
    if circle_2[number]=="*":
        circle_3=circle_2[:number]
        circle_4=circle_2[number+1:]
        infront=''
        behind=''
        for number_2 in range(number):
            infront=infront+circle_3[number_2]
        for number_2 in range(len(circle_2)-number-1):
            behind=behind+circle_4[number_2]
        print(infront+"*"+behind+"="+str(float(infront)*float(behind)))
    if circle_2[number]=="/":
        circle_3=circle_2[:number]
        circle_4=circle_2[number+1:]
        infront=''
        behind=''
        for number_2 in range(number):
            infront=infront+circle_3[number_2]
        for number_2 in range(len(circle_2)-number-1):
            behind=behind+circle_4[number_2]
        if behind=="0":
            print("除数不能为零...程序即将报错停止")
            assert False
        print(infront+"/"+behind+"="+str(float(infront)/float(behind)))

第2种,字符串find方法

print("Python简易计算器--字符串find方法")
circle=input("请输入一个四则运算式(800*4):")
if circle.find("+")!=-1:
    place_1=circle.find("+")
    print(circle[:place_1],"+",circle[place_1+1:],"=",str(float(circle[:place_1])+float(circle[place_1+1:])))
if circle.find("-")!=-1:
    place_1=circle.find("-")
    print(circle[:place_1],"-",circle[place_1+1:],"=",str(float(circle[:place_1])-float(circle[place_1+1:])))
if circle.find("*")!=-1:
    place_1=circle.find("*")
    print(circle[:place_1],"*",circle[place_1+1:],"=",str(float(circle[:place_1])*float(circle[place_1+1:])))
if circle.find("/")!=-1:
    place_1=circle.find("/")
    if circle[place_1+1:]=="0":
        print("除数不能为零...程序即将报错停止")
        assert False
    print(circle[:place_1],"/",circle[place_1+1:],"=",str(float(circle[:place_1])/float(circle[place_1+1:])))

第3种,partition分割三元数组方法

print("Python简易计算器--partition分割三元组方法")
circle=input("请输入一个四则运算式(800*4):")
if circle.partition("+")[0]!=circle:
    print(circle.partition("+")[0],"+",circle.partition("+")[2],"=",str(float(circle.partition("+")[0])+float(circle.partition("+")[2])))
if circle.partition("-")[0]!=circle:
    print(circle.partition("-")[0],"-",circle.partition("-")[2],"=",str(float(circle.partition("-")[0])-float(circle.partition("-")[2])))
if circle.partition("*")[0]!=circle:
    print(circle.partition("*")[0],"*",circle.partition("*")[2],"=",str(float(circle.partition("*")[0])*float(circle.partition("*")[2])))
if circle.partition("/")[0]!=circle:
    if circle.partition("/")[2]=="0":
        print("除数不能为零...程序即将报错停止")
        assert False
    print(circle.partition("/")[0],"/",circle.partition("/")[2],"=",str(float(circle.partition("/")[0])/float(circle.partition("/")[2])))

第4种,函数方法，也用到了find和partition

print("Python简易计算器--字符串find方法")
circle=input("请输入一个四则运算式(800*4):")
if circle.find("+")!=-1:
    def add(circle):
        num1=float(circle.partition("+")[0])
        num2=float(circle.partition("+")[2])
        print(str(num1),"+",str(num2),"=",str(num1+num2))
    add(circle)
if circle.find("-")!=-1:
    def decrease(circle):
        num1=float(circle.partition("-")[0])
        num2=float(circle.partition("-")[2])
        print(str(num1),"-",str(num2),"=",str(num1-num2))
    decrease(circle)
if circle.find("*")!=-1:
    def cheng(circle):
        num1=float(circle.partition("*")[0])
        num2=float(circle.partition("*")[2])
        print(str(num1),"*",str(num2),"=",str(num1*num2))
    cheng(circle)
if circle.find("/")!=-1:
    def chu(circle):
        num1=float(circle.partition("/")[0])
        num2=float(circle.partition("/")[2])
        if num2==0.0:
            print("除数不能为零...程序即将报错停止")
            assert False
        print(str(num1),"/",str(num2),"=",str(num1/num2))
    chu(circle)

永恒的蓝色梦想

建议学习代码风格

weiter

放到代码框里

比如这样

2417944015

weiter 发表于 2020-8-22 10:50
放到代码框里

get it

weiter

2417944015 发表于 2020-8-22 11:04
get it

谢谢采纳

dan维