Main tasks of the week:
1.python learning
2. Winter vacation algorithm training
3. Database related content
1. I just finished learning the basics of python in one week
The following is a case of student management system:
Design module flow chart:
The following is the complete code:
import os
filename='student.txt'
def main():
while True:
menu()
choice=int(input('Please select:'))
if choice in [0,1,2,3,4,5,6,7]:
if choice==0:
answer=input('Are you sure you want to exit the system? y/n')
if answer=='y' or answer=='Y':
print('Thank you for your use!')
break
else:
continue
elif choice==1:
insert()
elif choice==2:
search()
elif choice == 3:
delect()
elif choice == 4:
modify()
elif choice == 5:
sort()
elif choice == 6:
total()
elif choice == 7:
show()
def menu():
print('===========================Student information management system=============================')
print('--------------------------------Function menu-------------------------------')
print('\t\t\t\t\t1.Enter student information')
print('\t\t\t\t\t2.Find student information')
print('\t\t\t\t\t3.Delete student information')
print('\t\t\t\t\t4.Modify student information')
print('\t\t\t\t\t5.Sort student information')
print('\t\t\t\t\t6.Count the number of students')
print('\t\t\t\t\t7.Show all student information')
print('\t\t\t\t\t0.Exit the system')
print('---------------------------------------------------------------------')
def insert():
student_list=[]
while True:
id=input('Please enter ID(For example: 01101 X)')
if not id:
break
name=input('Please enter your name:')
if not name:
break
try:
English=int(input('Please enter your English score:'))
Java = int(input('Please enter Java Achievement:'))
python = int(input('Please enter python Achievement:'))
except:
print('Invalid entry / exit score, please re-enter:')
continue
#Save the information entered into the student in the dictionary
student={'id':id,'name':name,'English':English,'Java':Java,'Python':python}
#Add student list information to it
student_list.append(student)
answer=input('Continue adding? y/n')
if answer=='y' or 'Y':
continue
else:
break
#Call the save() function
sava(student_list)
print('Student information entry completed!')
def sava(lis):
try:
stu_txt=open(filename,'a',encoding='utf-8')
except:
stu_txt=open(filename,'w',encoding='utf-8')
for item in lis:
stu_txt.write(str(item)+'\n')
stu_txt.close()
def search():
student_query=[]
while True:
id=''
name=''
if os.path.exists(filename):
mode=input('Press ID Find input 1, find input 2 by name')
if mode=='1':
id=input('Please enter student id')
elif mode=='2':
name=input('Please enter student name')
else:
print('Your input is incorrect, please re-enter')
search()
with open(filename, 'r', encoding='utf-8') as rfile:
student=rfile.readlines()
for i in student:
d=dict(eval(i))
if id!='':
if['id']==id:
student_query.append(d)
elif name!='':
if['name']==name:
student_query.append(d)
#Display query results
show_student(student_query)
#clear list
student_query.clear()
answer=input('Do you want to continue the query? y/n')
if answer=='y' or 'Y':
continue
else:
break
else:
print('Student information has not been saved yet')
return
def show_student(lis):
if len(lis)==0:
print('No student information is found and no data is displayed')
return
#Define title display format
format_title='{:^6}\t{:^12}\t{:^8}\t{:^10}\t{:^10}\t{:^8}'
print(format_title.format('ID','full name','English achievement','Java achievement','python achievement','Total score'))
#Define the display format of content
format_data='{:^6}\t{:^12}\t{:^8}\t{:^8}\t{:^8}\t{:^8}'
for i in lis:
print(format_data.format(i.get('id')),
i.get('name'),
i.get('English'),
i.get('Java'),
i.get('python'),
int(i.get('English'))+int(i.get('Java'))+int(i.get('python')))
def delect():
while True:
student_id=input('Please enter the name of the student to delete ID: ')
if student_id!='':
if os.path.exists(filename):
with open(filename,'r',encoding='utf-8') as file:
student_old=file.readlines()
else:
student_old=[]
flag=False #Mark whether to delete
if student_id:
with open(filename, 'w', encoding='utf-8') as wfile:
d={}
for item in student_old:
d=dict(eval(item)) #Convert string to dictionary
if d['id']!=student_id:
wfile.write(str(d)+'\n')
else:
flag=True
if flag:
print(f'id by{student_id}Your student information has been deleted')
else:
print(f'Can't find ID by{student_id}Student information')
else:
print('No student information')
break
show() #Redisplay student information after deletion
answer=input('Continue deleting information? y/n')
if answer=='y' or 'Y':
continue
else:
break
def modify():
show()
if os.path.exists(filename):
with open(filename, 'r', encoding='utf-8') as rfile:
studendt_old=rfile.readlines()
else:
return
studendt_id=input('Please enter the name of the student you want to modify id:')
with open(filename, 'w', encoding='utf-8') as wfile:
for i in studendt_old:
d=dict(eval(i))
if d['id']==studendt_id:
print('Find the student information and modify it')
while True:
try:
d['name']=input('Enter student name:')
d['English']=input('Please enter your English score:')
d['python']=input('Please enter python achievement:')
d['Java']=input('Please enter Java achievement:')
except:
print('Your input is incorrect! Please re-enter:')
else:
break
wfile.write(str(d)+'\n')
print('Modification succeeded!')
else:
wfile.write(str(d) + '\n')
answer=input('Enter additional student information? y/n')
if answer=='y' or 'Y':
modify()
def sort():
show()
if os.path.exists(filename):
with open(filename, 'r', encoding='utf-8') as rfile:
student_list=rfile.readlines()
student_new=[]
for i in student_list:
d=dict(eval(i))
student_new.append(d)
else:
return
asc_or_desc=input('Please select sorting mode: 0-->Ascending, 1-->Descending order')
if asc_or_desc=='0':
asc_or_desc_bool=False
elif asc_or_desc=='1':
asc_or_desc_bool=True
else:
print('Your input is incorrect, please re-enter:')
sort()
mode=input('Please select sorting score: 1-->Sort by English score 2-->Press Java Grade ranking 3-->Press python Grade ranking 4-->Sort by total score')
if mode=='1':
student_new.sort(key=lambda student_new :int(['English']),reverse=asc_or_desc_bool)
elif mode=='2':
student_new.sort(key=lambda student_new :int(['Java']),reverse=asc_or_desc_bool)
elif mode=='3':
student_new.sort(key=lambda student_new :int(['python']),reverse=asc_or_desc_bool)
elif mode=='4':
student_new.sort(key=lambda student_new :int(['English'])+int(['Java'])+int(['python']),reverse=asc_or_desc_bool)
else:
print('Your input is incorrect, please re-enter')
sort()
show_student(student_new)
def total():
if os.path.exists(filename):
with open(filename, 'r', encoding='utf-8') as rfile:
students=rfile.readlines()
if students:
print(f'Altogether{len(students)}Students')
else:
print('Data information has not been saved yet')
else:
print('Temporarily save student information for...')
def show():
student_list=[]
if os.path.exists(filename):
with open(filename, 'r', encoding='utf-8') as rfile:
students=rfile.readlines()
for i in students:
student_list.append(eval(i))
if student_list:
show_student(student_list)
else:
print('Data not saved yet')
if __name__ == '__main__':
main()2. Winter vacation algorithm training and 3 Database related content
This week, I mainly studied the greedy algorithm and learned the concept of this algorithm, that is, "finding the maximum value under limited conditions",
The task of two questions a day has been written in previous blogs; Database related links are also available on the following blogs, which can be reviewed and consulted:
(101 messages) daily summary of winter vacation study D3_qq_53782756 blog - CSDN blog
(101 messages) daily summary of winter vacation study D4_qq_53782756 blog - CSDN blog
*** qq_ 53782756 blog - CSDN blog
Personal summary:
The first few days of this week are OK, but the situation is a little bad -#-!!! For their own reasons Therefore, through the tail of the weekend, make a promise to yourself, which can be regarded as isolating the bad mood in the past. Next semester must not fall in love, do a good job in learning and playing games!!! Wuhu!!! ^_^
A few days ago, I mainly studied python. I arranged the contents of the database, did some algorithm problems, and learned about the relevant knowledge of Naoqi robot. More or less, I was careless, or I got a little lost. Next week, I mainly want to start to understand OpenVC, and the algorithm problem will be regarded as the content that I have to punch in every day (the Blue Bridge Cup 300 also makes me feel a little painful, but I still can't play water drift). In addition, if you have spare time, you have to understand java web. It seems very interesting There is also the design of Java GUI interface in network security competition!
What's more, you should criticize yourself! Learn to control yourself. Don't let the emotion at the moment affect the emotion and things in the future. Don't give up in case of difficulties. I believe others can. I can, but I learn later than others. In addition, we should seize the time to study in the University and keep up with the excellent seniors and sisters. When you encounter difficult (algorithm) problems, you should be patient with the code and learn other people's programming methods and good habits. Excellent code makes people feel beautiful, fast and streamlined.