python實現簡易版學生成績管理系統
阿新 • • 發佈:2020-06-23
300來行python程式碼實現簡易版學生成績管理系統,供大家參考,具體內容如下
使用連結串列來實現
class Node(object): def __init__(self,data,pointer): self.data = data self.next = pointer # 建立單鏈表 class SingleLinkedList(object): def __init__(self): self.head = Node(None,None) self.point = self.head def append(self,data): # 末尾追加節點 new_node = Node(data,None) self.point.next = new_node self.point = new_node def insert(self,find): # 插入資料(前向插入資料) if not self.head.next: print('連結串列為空') return None new_node = Node(data,None) self.point = self.head while self.point.next.data != find: self.point = self.point.next if self.point.next is None: print('沒有找到該元素') return None new_node.next = self.point.next self.point.next = new_node def delete(self,find): # 刪除節點 # 空連結串列 if not self.head.next: print('連結串列為空') return None self.point = self.head while self.point.next.data != find: self.point = self.point.next pointer = self.point.next self.point.next = self.point.next.next del pointer def insert_after_head(self,data): node = Node(data,None) # bug 產生沒寫 if 返回 if not self.head.next: self.head.next = node return None node.next = self.head.next self.head.next = node def reverse(self): local_list = SingleLinkedList() self.point = self.head count = 0 while self.point.next: count += 1 self.point = self.point.next data = self.point.data local_list.insert_after_head(data) return local_list def get_size(self): count = 0 self.point = self.head while self.point.next: self.point = self.point.next count += 1 return count def delete_by_tail(self,num): size = self.get_size() assert (num <= size) assert (num > 0) pos = size - num count = 0 self.point = self.head while count < size: count += 1 self.point = self.point.next if count == pos: pointer = self.point.next self.point.next = self.point.next.next del pointer # 求中間節點 只允許遍歷一次 def quick_middle(self): slow_point = self.head fast_point = self.head while fast_point.next.next: slow_point = slow_point.next fast_point = fast_point.next.next if not fast_point.next: break if fast_point.next: slow_point = slow_point.next return slow_point.data def check_circle(self): pass def sort(self): # get_size()改變了 self.point 的指向 length = self.get_size() i,j = 0,0 flag = 1 while i < length: self.point = self.head.next while j < length - i - 1: if self.point.data > self.point.next.data: temp = self.point.data self.point.data = self.point.next.data self.point.next.data = temp self.point = self.point.next j += 1 flag = 0 if flag: break i += 1 j = 0 def print(self): # 列印結點 self.point = self.head while self.point.next: self.point = self.point.next print('{} ->'.format(self.point.data),end=' ') print('') class StudentControlSystem(SingleLinkedList): # 列印選單 def print_menu(self): print('*' * 30) print('-' * 13 + '選單' + '-' * 13) print('1.增加學生資訊') print('2.刪除學生資訊') print('3.修改學生資訊') print('4.查詢學生資訊') print('5.顯示所有資訊') print('6.排序') print('0.退出程式') print('*' * 30) # 使用者輸入 def user_input(self,item): try: item = int(item) except: pass # 增加資訊 if item == 1: self.add_info() # 刪除資訊 elif item == 2: find = input('請輸入刪除的學號:') self.del_info(find=find) # 修改資訊 elif item == 3: self.modify_info() # 查詢資訊 elif item == 4: self.search_info() # 顯示資訊 elif item == 5: self.display_info() # 資訊排序 elif item == 6: self.rank_info() # 退出程式 儲存資料 elif item == 0: with open('database.txt','w') as f: self.point = self.head while self.point.next: self.point = self.point.next f.writelines('{}\n'.format(self.point.data)) exit() else: print('請輸入正確的數字') # id 保證互異性 def unique_id(self,std_id): self.point = self.head while self.point.next: self.point = self.point.next if self.point.data['id'] == std_id: return False return True # 增加資訊 def add_info(self): # id 不能重複 # 成績不能超出範圍 name = input('姓名:') std_id = input('學生id:') while not self.unique_id(std_id=std_id): print('id重複') std_id = input('學生id:') grade = input('學生成績:') if eval(grade) < 0 or eval(grade) > 100: print('超出範圍') grade = input('學生成績:') print(name,std_id,grade) print('請確認無誤後儲存') choice = input('y/n') items = ['y','yes','Y','Yes'] if choice in items: print(choice) data = {'id': std_id,'name': name,'grade': grade} self.append(data) # 刪除資訊 def del_info(self,find): print('請確認無誤後儲存') choice = input('y/n') items = ['y','Yes'] if choice in items: if not self.head.next: print('連結串列為空') return None self.point = self.head while self.point.next.data['id'] != find: self.point = self.point.next pointer = self.point.next self.point.next = self.point.next.next del pointer # 序列逆序 def reverse(self): local_list = StudentControlSystem() self.point = self.head count = 0 while self.point.next: count += 1 self.point = self.point.next data = self.point.data local_list.insert_after_head(data) return local_list # 序列排序 def sort(self,item): length = self.get_size() i,0 flag = 1 while i < length: self.point = self.head.next while j < length - i - 1: if int(self.point.data[item]) > int(self.point.next.data[item]): # self.point.data,self.point.next.data = # self.point.next.data,self.point.data temp = self.point.data self.point.data = self.point.next.data self.point.next.data = temp self.point = self.point.next j += 1 flag = 0 if flag: break i += 1 j = 0 # 修改資訊 def modify_info(self): find = input('輸入需要修改的學生的id:') if not self.head.next: print('連結串列為空') return None self.point = self.head while str(self.point.next.data['id']) != find: self.point = self.point.next if self.point.next is None: print('沒有找到該元素') return None name = input('姓名:') grade = input('學生成績:') self.point.next.data['name'] = name self.point.next.data['grade'] = grade # 搜尋資訊 def search_info(self): find = input('輸入需要查詢的學生的id:') if not self.head.next: print('連結串列為空') return None self.point = self.head while str(self.point.next.data['id']) != find: self.point = self.point.next if self.point.next is None: print('沒有找到該元素') return None data = self.point.next.data print('ID 姓名 成績') print('{} {} {}'.format(data['id'],data['name'],data['grade'])) # 資訊排序 def rank_info(self): choice = input('1.成績排序 2.學號排序:') order = input('1.升序 2.降序:') if choice == '1': item = 'grade' elif choice == '2': item = 'id' else: return None self.sort(item=item) if order == '2': temp = self.reverse() temp.display_info() return None self.display_info() # 顯示資訊 def display_info(self): self.point = self.head print('ID 姓名 成績') while self.point.next: self.point = self.point.next data = self.point.data print('{} {} {}'.format(data['id'],data['grade'])) print('') def main(): SCS = StudentControlSystem() try: with open('database.txt','r') as f: for data in f.readlines(): SCS.append(eval(data)) except: with open('database.txt','w') as f: pass while True: SCS.print_menu() item = input('請輸入你的選擇:') SCS.user_input(item) if __name__ == "__main__": main()
執行後
然後就可以插入與查詢啦
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