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app.py

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+import streamlit as st
+import pymongo
+
+url='mongodb+srv://baoyuxin1994:0817@cluster0.rcvcj3s.mongodb.net/?retryWrites=true&w=majority'
+client=pymongo.MongoClient(url)
+db=client['todo']
+collection=db['tasks']
+
+st.title('TODO app')
+
+
+page=st.sidebar.selectbox('Menu',['Home','Insert','Edit','Delete'])
+
+if page=='Insert':
+    st.header('Insert Task')
+    task=st.text_input('Task')
+    category=st.selectbox('Category',['','Work','Personal','Shopping'])
+    ranking=st.slider('Priority', 0, 5, 0)
+    
+    if st.button('Insert your task'):
+        if task.strip() == "":
+            st.warning('Task can not be empty',icon='⚠️')
+        elif category.strip() == "":
+            st.warning('Category can not be empty',icon='⚠️')
+        elif ranking == 0:
+            st.warning('Priority can not be 0',icon='⚠️')
+        else:
+            collection.insert_one({'task':task, 'category':category,'Priority':ranking})
+            st.success('Successfully Inserted')
+    
+elif page=='Edit':
+    st.header('Edit Task')
+    
+    _task = collection.find({},{'task':1,'_id':0})
+    _task_list=[]
+    for t in _task:
+        _task_list.append(t['task'])
+        
+    old_one=st.selectbox('Select the one to edit',_task_list) 
+    
+    new_one=st.text_input('New Task')
+    category=st.selectbox('Category',['','Work','Personal','Shopping'])
+    ranking=st.slider('Priority', 0, 5, 0)
+    
+    if st.button('Edit your task'):  
+        if new_one.strip() == "":
+            st.warning('Task can not be empty',icon='⚠️')
+        elif category.strip() == "":
+            st.warning('Category can not be empty',icon='⚠️')
+        elif ranking == 0:
+            st.warning('Priority can not be 0',icon='⚠️')
+        else: 
+            collection.replace_one(collection.find_one({},{'task':old_one}),{'task':new_one,'category':category,'Priority':ranking})
+            st.success('Successfully Edited')
+        
+elif page=='Delete':
+    st.header('Delete Task')
+    tasks=collection.find({},{'_id':0})
+    
+    _task = collection.find({},{'task':1,'_id':0})
+    _task_list=[]
+    
+    for t in _task:
+        _task_list.append(t['task'])
+    
+    delete_the_task=st.selectbox('Delete',_task_list)
+    
+    if st.button('Delete your task'):
+        collection.delete_one({'task':delete_the_task})
+        st.success('Successfully Deleted')
+    
+    
+elif page=='Home':
+    st.header('Home')
+    st.write('This is a Todo list which allows you to read, insert,edit and delete')
+    #tasks=collection.find({},{'_id':0})
+    #st.table(tasks)
+    
+    all_tasks=collection.find({},{'_id':0}).sort({'Priority':-1,})
+    st.table(all_tasks)