我是编程新手，但我有点挣扎。 我正在使用python，我应该写一个通讯录，在这里我可以修改当前联系人，但我做不到。
这是修改当前联系人的代码：
print("Here is your address book.")
ContactList = []
'''import os
import time
saveFile = open("contactlist.txt", "r")
contactString = saveFile.read()
saveFile.close()
ContactList = ContactListString.split('\n')
while '' in ContactList:
ContactList.remove('')'''
def saveContacts():
oFile = open("contactlist.txt", 'w')
for contact in ContactList:
oFile.write(contact[0] + ', ' + contact[1] + ', ' + contact[2] + '\n')
oFile.close()
#To save information and then use it to save information during other processes.
#It's to save information about the different contacts.
def addContact():
print("You have chosen to add a new contact into your address book.")
name = input("What's the contacts name? ")
counter = ContactList.count(name)
if counter == 0:
address = input("Enter the address of " + name + ': ')
email = input("Enter the email of " + name + ': ')
ContactList.append([ name, address, email ])
saveContacts()
else:
print("The contact already exists in the address book.")
print("If you desire to change the contacts current information, enter nr 3 in the menu.")
#Here we're supposed to add new contacts.
#The variables counter are there to see if the name that the person is trying to add already exist or not.'
#This will help the person so that they won't get multiple people with the same name and information.
#If the contact already exist you have the option to either let it stay or modify it by entering nr. 3 in the menu.
def deleteContact():
print("You have chosen to delete a specific contact from your address book.")
printContacts()
number = int(input("What contact do you want to remove?"))
ContactList.pop(number - 1)
print("The contact and the information about them are now deleted from the adress book.")
saveContacts()
printContacts()
#Here is where you're supposed to delete your contact.
#When you choose a number, everything in that line, whether you have their address and email, will get deleted.
#Then it will save the new so called update and print all your contacts for you to view them.
def printContacts():
index = 1
for contact in ContactList:
print("{}: {}".format(index, contact))
index = index + 1
saveContacts()
#This exist because we want to print contacts out, to view them and to sort them after an index to make it easier for us to view and choose contact.
#It makes it easier for us to just add a number from the index instead of opening up a new file etc..
def browseContacts():
print("You have chosen to view all your contacts with their name, address and email.")
print(ContactList)
#Here is where you can browse and see all your contacts and be able to view them all from your contact list.
#You're also able to viwe their name, address and email all at once.
def searchContacts():
print("Here you'll be able to search for people that are already in the address book.")
criteria = input("Please enter any keywords, including name, address or email to find the contact: ")
for line in ContactList:
if criteria in line:
print(line)
else:
print("Couldn't find that contact. Please add him/her/it to the address book first or check if your spelling was correct or not.")
#Here you're able to search up contacts that you currently have in your contact list.
#When you search them up : you will be able to see their name, their address and their email all at once.
#If the program doesn't find their name, address or email : it tells you to add him/her/it into your list before searching it up.
def modifyContacts():
printContacts()
contactToEdit = int(input("What contact do you want to edit? Choose a number."))
Contact = contact[contactToEdit-1]
print("If you want to edit, press 1 : ")
print("If you dont want to edit, press 2: ")
toEdit = input("")
if toEdit == "1":
Contact["name"] = input('Enter your new name: ')
Contact["address"] = input('Enter your new address: ')
Contact["email"] = input('Enter your new mail: ')
# ContactList[0] = input(' Enter the new name of the contact: ')
# ContactList[1] = input(' Enter the new address of ' + ContactList[0] + ': ')
# ContactList[2] = input(' Enter the new e-mail of ' + ContactList[0] + ': ')
elif toEdit == "2":
print("You can choose to do something else.")
else:
print("Not a valid option.")
print()
'''
toEdit = input("")
if toEdit == "1":
# ContactList.append(input(' Enter the new name of the contact: '))
# ContactList.append(input(' Enter the new address of ' + str(ContactList[0]) + ': '))
# ContactList.append(input(' Enter the new e-mail of ' + str(ContactList[0]) + ': '))
contact[0] = input(' Enter the new name of the contact: ')
contact[1] = input(' Enter the new address of ' + ContactList[0] + ': ')
contact[2] = input(' Enter the new e-mail of ' + ContactList[0] + ': ')
elif toEdit == "2":
print("You can choose to do something else.")
else:
print("Not a valid option.")
print()
'''
running = True
while running == True:
print('''
-------------------------------------------------------------------
Choose what you want to do / The menu:
1: Add a new contact : please enter nr. 1
2: Delete a contact : please enter nr. 2
3: Modify a current contact : please enter nr. 3
4: Search up a contact : please enter nr. 4
5: Browse current contacts : please enter nr. 5
6: Quit the program : please enter nr. 6
-------------------------------------------------------------------''')
chooseAct = input("Please enter the number of what you desire to do: ")
if chooseAct == '1':
addContact()
elif chooseAct == '2':
deleteContact()
elif chooseAct == '3':
modifyContacts()
elif chooseAct == '4':
searchContacts()
elif chooseAct == '5':
browseContacts()
elif chooseAct == '6':
print("Shutting down. Thank you for using the adressbook!")
running = False
else:
print('\n The entered command does not exist within this program. Please enter one of the actions shown in the menu below: \n')
#Here is a menu and for the user to choose what to do, do they want to add, delete, modify, search up, browse or quit the program : it's all their choice.
#It's easy to have a menu because it results in easy accses to whatever you desire to do.
#It's also in a running state so you decide when you want the program to quit running.
#The variable (chooseAct) is there as an input of a lot of strings with lots of functions to do different things.
#There is also else : so if you click on a value which is not avaliable, you have the choice to rewrite one or quit the program, the choices you have are rewritten for you in the menu.
我的ContactList的代码是这样的：
ContactList = []
我不明白问题是什么，当我有ContactList [0]，ContactList [1]和ContactList [2]时，它说列表不在范围内，但是我应该在哪里告诉我多长时间该列表应该是吗？
我意识到，追加会导致我得到一个我不想要的全新联系人，我想修改当前联系人，所以这是错误的。
但是我应该怎么做才能真正修改当前联系人？ 我应该如何使列表“可用”？
非常感谢您！
答案 0 :(得分：0)
要从一个空列表开始，您需要先添加一个。您可以通过在修改条件之前添加条件来避免错误。最好的方法是分离代码并编写用于添加联系人的专用功能。
def modifyContacts():
if not ContactList:
addContacts()
else:
# your modifying code
def addContacts():
# your adding contact code
答案 1 :(得分：0)
您需要将字典与列表结合使用才能获得最佳输出！希望如此
contacts = []
def createcontact():
newcontact = {}
newcontact["name"] = input('Enter your name: ')
newcontact["address"] = input('Enter your address: ')
newcontact["email"] = input('Enter your mail: ')
contacts.append(newcontact)
def printContacts():
for contact in range(len(contacts)):
print(str(contact+1)+") Name:"+contacts[contact]["name"]+" Address:"+contacts[contact]["address"]+" Email:"+contacts[contact]["email"])
def modifyContacts():
printContacts()
contactToEdit = int(input("What contact do you want to edit? Choose a number."))
Contact = contacts[contactToEdit-1]
print("If you want to edit, press 1 : ")
print("If you dont want to edit, press 2: ")
toEdit = input("")
if toEdit == "1":
Contact["name"] = input('Enter your new name: ')
Contact["address"] = input('Enter your new address: ')
Contact["email"] = input('Enter your new mail: ')
# ContactList[0] = input(' Enter the new name of the contact: ')
# ContactList[1] = input(' Enter the new address of ' + ContactList[0] + ': ')
# ContactList[2] = input(' Enter the new e-mail of ' + ContactList[0] + ': ')
elif toEdit == "2":
print("You can choose to do something else.")
else:
print("Not a valid option.")
print()
createcontact()
createcontact()
modifyContacts()
printContacts()