Create app.py

app.py

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+import streamlit as st
+import pandas as pd
+from datetime import datetime
+import os
+
+DATA_FILE = "habits.csv"
+
+# Load data
+def load_data():
+    if os.path.exists(DATA_FILE):
+        return pd.read_csv(DATA_FILE)
+    else:
+        return pd.DataFrame(columns=["Habit", "Streak", "Last Completed"])
+
+# Save data
+def save_data(df):
+    df.to_csv(DATA_FILE, index=False)
+
+# Initialize
+if "habits" not in st.session_state:
+    st.session_state.habits = load_data()
+
+st.title("📌 Atomic Habit Tracker")
+
+# --- Add Habit ---
+st.subheader("Add New Habit")
+new_habit = st.text_input("Enter habit name")
+
+if st.button("Add Habit"):
+    if new_habit.strip() == "":
+        st.warning("Enter a valid habit name")
+    elif new_habit in st.session_state.habits["Habit"].values:
+        st.warning("Habit already exists")
+    else:
+        new_row = pd.DataFrame([[new_habit, 0, "Never"]],
+                               columns=st.session_state.habits.columns)
+        st.session_state.habits = pd.concat(
+            [st.session_state.habits, new_row],
+            ignore_index=True
+        )
+        save_data(st.session_state.habits)
+        st.success(f"Habit '{new_habit}' added!")
+
+# --- Mark Habit Done ---
+st.subheader("Mark Habit as Done")
+habit_list = st.session_state.habits["Habit"].tolist()
+
+if habit_list:
+    selected_habit = st.selectbox("Select Habit", habit_list)
+
+    if st.button("Mark Done"):
+        today = datetime.now().date()
+        df = st.session_state.habits
+
+        idx = df[df["Habit"] == selected_habit].index[0]
+        last_date = df.loc[idx, "Last Completed"]
+
+        # Streak logic
+        if last_date != "Never":
+            last_date = pd.to_datetime(last_date).date()
+            if (today - last_date).days == 1:
+                df.loc[idx, "Streak"] += 1
+            elif (today - last_date).days > 1:
+                df.loc[idx, "Streak"] = 1
+        else:
+            df.loc[idx, "Streak"] = 1
+
+        df.loc[idx, "Last Completed"] = str(today)
+
+        st.session_state.habits = df
+        save_data(df)
+
+        st.success(f"Habit '{selected_habit}' marked as done!")
+
+else:
+    st.info("No habits added yet.")
+
+# --- Display Data ---
+st.subheader("Your Habits")
+st.dataframe(st.session_state.habits)
+
+# --- Delete Habit ---
+st.subheader("Delete Habit")
+
+if habit_list:
+    delete_habit = st.selectbox("Select Habit to Delete", habit_list, key="delete")
+
+    if st.button("Delete Habit"):
+        st.session_state.habits = st.session_state.habits[
+            st.session_state.habits["Habit"] != delete_habit
+        ]
+        save_data(st.session_state.habits)
+        st.success(f"Habit '{delete_habit}' deleted!")
+
+# --- Reset All ---
+st.subheader("Danger Zone ⚠️")
+
+if st.button("Reset All Habits"):
+    st.session_state.habits = pd.DataFrame(
+        columns=["Habit", "Streak", "Last Completed"]
+    )
+    save_data(st.session_state.habits)
+    st.warning("All habits cleared!")