Python is indeed a language for zero-based programming enthusiasts to learn. python's programs can be understood, but it is difficult to achieve. This is a problem that almost every beginner who learns Python will encounter. Memory is better than bad writing. Applying knowledge to practical projects is the best way to remember.
After familiarizing ourselves with python's common data types, we can start to gracefully operate a small project to implement a business card management system.
It can achieve the following functions:
Business Card Management System
1. Add business cards
2. Delete business cards
3. Modify business cards
4. Search for business cards
5. Exit the system
0. Display all business cards
Add business cards
The idea of programming is to create a temporary templist variable, add, name, mobile phone number, address and other information through templist. Appnd () method, and then append the templist list list to the mainList list.
def increMem(aList):
tempList = []
tempName = input("Enter the name of the new business card:")
tempList.append(tempName)
while True:
tempPhone = input("Enter the new contact number:")
if tempPhone.isnumeric(): break
else: print("Enter incorrectly, re-enter")
tempList.append(tempPhone)
tempAddr = input("Enter the new contact address:")
tempList.append(tempAddr)
print("Enter new contact information:")
showList(tempList)
aList.append(tempList)
Be careful:
Cell phone numbers are all numbers, you can use the list.isnumeric() method to determine whether it is a pure digital string, not return False.
Delete business cards
Programming idea: first calculate whether it is empty, if it is empty to return, then first locate and delete the index value of the contact, and finally delete the contact through the del() function.
def delMem(aList):
i = 0
if len(aList) == 0 :
print("No contacts, Please add contacts first!")
return
tempName = input("Enter the contact to delete:")
for mumList in aList:
if tempName != mumList[0] :
i += 1
continue
else:
showList(aList[i])
while True:
tempIn = input("Whether to delete this contact: Y(yes)\t N(no) :")
if tempIn =="Y" or tempIn == "y":
del(aList[i])
print("Delete successfully!")
return
elif tempIn == "N" or tempIn == "n":
print("Re-enter the contact!")
delMem(aList)
return
else:
print("Enter incorrectly, re-enter!")
if i == len(aList):
print("Input contact heat does not exist, please re-enter!")
delMem(aList)
Be careful:
What if the deleted contact does not exist? For mainList traversal, each element is an element of a list structure. If the contact to be deleted is not equal to numLinst[0], continue, i increases by 1. If all of them are traversed, then i = len(aList), then judge that the contact does not exist and re-enter.
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Modify business cards
Modify business cards, first locate and then modify
def modMem(aList):
i = 0
if len(aList) == 0 :
print("No contacts, Please add contacts first!")
return
tempList = input("Enter contacts that need to be modified:")
for numList in aList:
if tempList != numList[0] :
i += 1
continue
else:
tempInf = input("Enter the modified information:")
if tempInf.isnumeric():
numList[1] = tempInf
else:
numList[2] = tempInf
if i == len(aList):
print("Input error, re-enter!")
modMem(aList)
Be careful:
is.numeric() method, judgment, is all digital, is to modify the phone number, otherwise it is the address.
Look for business cards
First locate, then output. Pay attention to the situation when there are no contacts
def LocaMem(aList):
i = 0
if len(aList) == 0 :
print("No contacts, Please add contacts first!")
return
tempList = input("Enter the contacts you need to find:")
for numList in aList:
if tempList != numList[0] :
i += 1
continue
else:
showList(numList)
if i == len(aList):
print("Input error, re-enter!")
modMem(aList)
Complete program block
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def men():
print("\t*****************")
print("\t Business Card Management System\n")
print("\t 1.Add business cards\n")
print("\t 2.Delete business cards\n")
print("\t 3.Modify business cards\n")
print("\t 4.Inquiring Business Cards\n")
print("\t 5.Exit System\n")
print("\t 0.Display all business cards\n")
print("\t*****************")
def increMem(aList):
tempList = []
tempName = input("Enter the name of the new business card:")
tempList.append(tempName)
while True:
tempPhone = input("Enter the new contact number:")
if tempPhone.isnumeric(): break
else: print("Enter incorrectly, re-enter")
tempList.append(tempPhone)
tempAddr = input("Enter the new contact address:")
tempList.append(tempAddr)
print("Enter new contact information:")
showList(tempList)
aList.append(tempList)
def showList(aList):
print("Name: %s"%aList[0],\
"Telephone:%s"%aList[1], \
"Address:%s"%aList[2],"\n")
def showMem(aList):
if len(aList) == 0:
print("No contact!")
for mumList in aList:
print("Name: %s"%mumList[0],\
"Telephone:%s"%mumList[1], \
"Address:%s"%mumList[2],"\n")
def delMem(aList):
i = 0
if len(aList) == 0 :
print("No contacts, Please add contacts first!")
return
tempName = input("Enter the contact to delete:")
for mumList in aList:
if tempName != mumList[0] :
i += 1
continue
else:
showList(aList[i])
while True:
tempIn = input("Whether to delete this contact: Y(yes)\t N(no) :")
if tempIn =="Y" or tempIn == "y":
del(aList[i])
print("Delete successfully!")
return
elif tempIn == "N" or tempIn == "n":
print("Re-enter the contact!")
delMem(aList)
return
else:
print("Enter incorrectly, re-enter!")
if i == len(aList):
print("Input contact heat does not exist, please re-enter!")
delMem(aList)
def modMem(aList):
i = 0
if len(aList) == 0 :
print("No contacts, Please add contacts first!")
return
tempList = input("Enter contacts that need to be modified:")
for numList in aList:
if tempList != numList[0] :
i += 1
continue
else:
tempInf = input("Enter the modified information:")
if tempInf.isnumeric():
numList[1] = tempInf
else:
numList[2] = tempInf
if i == len(aList):
print("Input error, re-enter!")
modMem(aList)
def LocaMem(aList):
i = 0
if len(aList) == 0 :
print("No contacts, Please add contacts first!")
return
tempList = input("Enter the contacts you need to find:")
for numList in aList:
if tempList != numList[0] :
i += 1
continue
else:
showList(numList)
if i == len(aList):
print("Input error, re-enter!")
modMem(aList)
if __name__ == "__main__":
mainList = []
men()
while True:
index = input("Enter the task number:")
if not index.isnumeric():
print("Please enter the index number (1)-4): ")
continue
index = int(index)
#Traversing business cards
if index == 0:
showMem(mainList)
#Increase business cards
if index == 1:
increMem(mainList)
if index == 2:
delMem(mainList)
if index == 3:
modMem(mainList)
if index == 4:
LocaMem(mainList)
if index == 5:
print("Exit the system!")
break