我有一个学生管理程序，我使用for循环在列表内的字典中查找，因此我有if和elif条件来搜索学生数据。但是，它也提供3或4个elif条件的输出。我希望如果程序找不到学生数据，则只打印一次“找不到学生”，如果我有学生数据，则仅if子句不应运行elif。
import json
while True:
student={}
with open('Data file for student management system.json','r') as f:
students=json.load(f)
print('''\n"1 or add" to Add Student''')
print('''"2 or edit" to Edit Student''')
print('''"3 or delete" to Delete Student''')
print('''"4 or search" to Search Student''')
print('''"5 or display" to Display all Students''')
while True:
try:
option=str(input('''\nPlease enter any option given above:'''))
if option not in ['1','2','3','4','5','add','delete','edit','search','display']:
print('''\n"Please select a correct options"''')
else:
break
except ValueError:
print('''"Please enter a correct number only"''')
if option in ['1','add']:
student["Name"] = input ("\nStudent's Name:").title()
student["Father Name"] = input ("Father's Name:").title()
student["Age"] = input ("Student's Age:")
student["Address"] = input ("Address:").title()
students.append(student)
with open('Data file for student management system.json','w') as f:
json.dump(students,f)
student={}
print('''\n"Addition Successful"''')
elif option in ['2','edit']:
Name=input("\nPlease type name:").title()
new_name=input("\nWhat is new name:").title()
for s in list(students):
for d in s:
if s['Name']==Name:
s['Name']=new_name
print('''\n"Edit Successful"''')
with open('Data file for student management system.json','w') as f:
json.dump(students,f)
elif s['Name']!=Name:
print('''\n"Student not found"''')
break
elif option in ['3','delete']:
del_name=input("\nPlease type name of student you want to delete:").title()
for s in list(students):
for d in s:
if s['Name']==del_name:
ind=students.index(s)
while True:
sure=input('\nAre you sure you want to delete?\n\nYes or No:').lower()
if sure in ['yes','y']:
del students[ind]
print('''\n"Deletion Successful"''')
with open('Data file for student management system.json','w') as f:
json.dump(students,f)
break
elif sure in ['no','n']:
print("\nStudent data not deleted")
break
else:
print('''"\nPlease enter a coorect option"''')
break
elif s['Name']!=del_name:
print('''\n"Student not found"''')
break
elif option in ['4','search']:
s_name=input("\nEnter name of student:").title()
for d in students:
for k,v in d.items():
if d['Name']==s_name:
print(" ____________________________________________________________________________________________________________________________")
print("| | | | |")
print("| S-No | Name | Father Name | Address |")
print("|__________|________________________________|_________________________________|______________________________________________|")
print(f"| |{d['Name']: <32}|{d['Father Name']: <33}|{d['Address']: <46}|")
print("|__________|________________________________|_________________________________|______________________________________________|")
break
elif d['Name']!=s_name:
print('''\n"Student not found"''')
break
elif option in ['5','display']:
print(" ____________________________________________________________________________________________________________________________")
print("| | | | |")
print("| S-No | Name | Father Name | Address |")
print("|__________|________________________________|_________________________________|______________________________________________|")
for s in students:
for k,v in s.items():
pass
print(f"| |{s['Name']: <32}|{s['Father Name']: <33}|{s['Address']: <46}|")
print("|__________|________________________________|_________________________________|______________________________________________|")
while True:
Repeat=input("\nDo you want to repeat?\n\nYes or No:")
Repeat=Repeat.lower()
if Repeat not in ["yes","y","no","n"]:
print("\nPlease select correct option")
else:
break
if Repeat in ["yes","y"]:
continue
else:
if Repeat in ["no","n"]:
print("\n-----Thank you for using-----")
input()
break
[{"GR#": 1, "Name": "Daniyals", "Age": 12, "Father Name": "Ajaz", "Address": "Flat-123, Block ABC"}, {"GR#": 2, "Name": "Shahrukh Khan", "Age": 9, "Father Name": "Ajeeb Khan", "Address": "Khan Mansion"}, {"Name": "Waseem Munir", "Father Name": "Sdasd", "Age": "asdasdas", "Address": "Asdasdas"}, {"Name": "Saad", "Father Name": "Asdsadas", "Age": "asdasdas", "Address": "Asdas"}, {"Name": "Sdasd", "Father Name": "Adsadas", "Age": "dasdas", "Address": "Dasdas"}]
答案 0 :(得分：0)
我建议使用pandas dataFrame它将使它变得如此简单。
import pandas as pd
df = pd.DataFrame(
{'Name': ['a','b','c','d'], #Your name list here
'Fathers Name': np.zeros(4), #Your data here
'Address': np.zeros(4), #Your data here and add more columns
})
s_name=input("\nEnter name of student:").title()
for i in range(len(df)):
if df['Name'][i] == s_name:
print(df.loc[i])