我试图设置一个全局变量'help'来显示我代码中的函数。目标是用户输入“帮助”一词时,我可以显示我创建的表。这个函数名为table(),我想显示它。
我的代码如下:

def table():
    header=(" Operation      Command-line Format")
    underline=("_________      ___________________")
    meat=("Union                   set1&set2 \n Intersection            set1|set2 \n Difference              set1-set2 \n Symmetric difference    set1 ^ set2 \n Cartesian product       set1 X set2 \n Subset                  set1<=set2 \n Proper subset           set1<set2 \n Super set               set1=>set2 \n Proper super set        set1>set2 \n Cardinality             card set1 \n Membership-in           xE set1      where x is single element\n Membership-not-in       x!Eset1      where x is single element\n Power set               power set1\n Display this table      help")
    print(header, "\n",underline,"\n",meat)




def intro():


    firstChoice=input("Would you like to get the sets from a file or input your own? \n Press 1 for from file \n Press 2 to input your own")
    if input is 'help':
        table()

    if firstChoice== '1':
        fileChoice=input("Please enter the fle you would like to open")


        with open(fileChoice, 'r+') as f:

            z=f.readlines()
            length=len(z)
            try:
                if z != len(z):
                    fileSet1=z[length-length]
                    if length-length != " ":
                        fileSet1=fileSet1.strip('\n')
                        fileSet1=str(fileSet1)
                        fileSet1.split(',')
                        fileSet1=set([fileSet1])
                    fileSet2=z[length-length+1]
                    if length-length+1 != " ":
                        fileSet2=fileSet2.strip('\n')
                        fileSet2=str(fileSet2)
                        fileSet2.split(',')
                        fileSet2=set([fileSet2])
                    fileSet3=z[length-length+2]
                    if length-length+2 != " ":
                        fileSet3=fileSet3.strip('\n')
                        fileSet3=str(fileSet3)
                        fileSet3.split(',')

                        fileSet3=set([fileSet3])


                    fileSet4=z[length-length+3]
                    if length-length +3 != " ":
                        fileSet4=fileSet4.strip('\n')
                        fileSet4=str(fileSet4)
                        fileSet4.split(',')

                        fileSet4=set([fileSet4])


                    print ("This is fileSet1 \n",fileSet1)
                    print ("This is fileSet2 \n",fileSet2)
                    print ("This is fileSet3 \n",fileSet3)
                    print ("This is fileSet4 \n",fileSet4)

            except:
                try:
                    print ("This is fileSet1 \n",fileSet1,"\nThis is fileSet2 \n",fileSet2,"\nThis is fileSet3 \n",fileSet3)
                except:
                    print ("This is fileSet1 \n",fileSet1,"\nThis is fileSet2 \n",fileSet2)


            f.close()





    elif firstChoice== '2':
        keep_going= 'yes'
        userSet=input("Please enter the set you would like to use. " )
        userSet1=userSet.split(',')
        userset1=set(userSet1)





        print("User set 1 ", userset1)
        keep_going=input("would you like to go again? Please respond with yes or no")
        while keep_going == 'yes':
            userSet=input('what other set would you like to use? ')
            userSet2=userSet.split(',')
            userset2=set(userSet2)



            print ("user set 2 ", userset2)
            keep_going=input ("Would you like to use another set too? ")
            if keep_going== 'yes':
                userSet=input("Th other set you would like to use?")
                userSet3=userSet.split(',')
                userset3=set([userSet3])
                print("user set 3 ", userset3)
                keep_going=input("would you like to keep going? ")
                if keep_going== 'yes':
                    userSet=input("Th other set you would like to use?")
                    userSet4=userSet.split(',')
                    userset4=set([userSet4])
                    print("user set 4 ", userset4)
                    keep_going==input("Another one?")
                    if keep_going == 'yes':
                        print ("i don't think we need another set")
                        keep_going='no'


    firstSet=input("which set would you like to use for operations \nplease type in userset1,userset2, userset3, userset4 or \n                fileSet1,fileSet2,fileSet3 or fileSet4  ")
    if firstSet == "userset1":
        set1=userset1


        print ("this is set1",set1)
    elif firstSet =="userset2":
        set1=userset2

        print ("this is set1",(set1))
    elif firstSet =="userset3":
        set1=userset3

        print ("this is set1",(set1))
    elif firstSet =="userset4":
        set1=userset4

        print ("this is set1",(set1))
    elif firstSet =="fileSet1":
        set1=fileSet1

        print ("this is set1",(set1))
    elif firstSet =="fileSet2":
        set1=fileSet2

        print ("this is set1",(set1))
    elif firstSet =="fileSet3":
        set1=fileSet3

        print ("this is set1",(set1))
    elif firstSet =="fileSet4":
        set1=fileSet4

        print ("this is set1",(set1))
    else:
        print ('your bad')


    secondSet=input("What other set would you like to use for operations \n please type in userset1,userset2, userset3, userset4, setFile ")
    if secondSet == "userset1":
        set2=userset1

        print ("this is set2",set2)
    elif secondSet =="userset2":
        set2=userset2


        print ("this is set2",(set2))
    elif secondSet =="userset3":
        set2=userset3

        print ("this is set2",(set2))
    elif secondSet =="userset4":
        set2=userset4

        print ("this is set2",(set2))
    elif secondSet =="fileSet1":
        set2=fileSet1

        print ("this is set1",(set1))
    elif secondSet =="fileSet2":
        set2=fileSet2

        print ("this is set1",(set1))
    elif secondSet =="fileSet3":
        set2=fileSet3

        print ("this is set1",(set1))
    elif secondSet =="fileSet4":
        set2=fileSet4

        print ("this is set1",(set1))

    else:
        print ('your bad')


    table()



    commandinput=input("please select the operation you would like to do")
    commandinput=commandinput.split()
    if '&' in commandinput:
        union=set1.union(set2)
        print(union)
    elif '|' in commandinput:
        intersetction=set1.intersection(set2)
        print(intersection)
    elif '-' in commandinput:
        difference=set1/difference(set2)
        print(difference)
    elif '^' in commandinput:
        symmetric=set1.symmetric_difference(set2)
        print(symmetric)
    elif 'X' in commandinput:
        print ("HIGH")

    elif '<=' in commandinput:
        subset=set2.issubset(set1)
        print(subset)
    elif '<' in commandinput:
        print ("HIGH")
    elif '=>' in commandinput:
        subset=set2.issuperset(set1)
        print(subset)
    elif '>' in comandinput:
        print ("HIGH")
    elif 'card' in commandinput:
        length=len(set1)
        print(length)
    elif 'E' in commandinput:

        x=input("what would you like to search for")
        if x in set1:
            print ( "It is in here!!")
        else:
            print("It isn't in here")

    elif '!E' in commandinput:
        x=input("what would you like to search for ")
        if x in set1:
            print ("It is in here")
        else:
            print ("Not here!")
    elif "power" in commandinput:
        print ("HIGH")
    elif 'help' in commandinput:
        print(table())









intro()

最佳答案

您应该使用==,而不是isis测试字符串是否与内存中的对象完全相同,而它们可能不是。
if firstChoice == 'help':

关于python - 设置全局变量来执行功能,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/10325417/

10-14 02:18