Update app.py

app.py

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+import streamlit as st
+
+# Conversion functions
+def length_converter(value, from_unit, to_unit):
+    length_units = {
+        "meter": 1.0,
+        "kilometer": 0.001,
+        "centimeter": 100.0,
+        "millimeter": 1000.0,
+        "mile": 0.000621371,
+        "yard": 1.09361,
+        "foot": 3.28084,
+        "inch": 39.3701
+    }
+    return value * (length_units[to_unit] / length_units[from_unit])
+
+def weight_converter(value, from_unit, to_unit):
+    weight_units = {
+        "kilogram": 1.0,
+        "gram": 1000.0,
+        "milligram": 1000000.0,
+        "pound": 2.20462,
+        "ounce": 35.274
+    }
+    return value * (weight_units[to_unit] / weight_units[from_unit])
+
+def temperature_converter(value, from_unit, to_unit):
+    if from_unit == to_unit:
+        return value
+    if from_unit == "Celsius":
+        return value * 9/5 + 32 if to_unit == "Fahrenheit" else value + 273.15
+    if from_unit == "Fahrenheit":
+        return (value - 32) * 5/9 if to_unit == "Celsius" else (value - 32) * 5/9 + 273.15
+    if from_unit == "Kelvin":
+        return value - 273.15 if to_unit == "Celsius" else (value - 273.15) * 9/5 + 32
+
+def time_converter(value, from_unit, to_unit):
+    time_units = {
+        "second": 1,
+        "minute": 1/60,
+        "hour": 1/3600,
+        "day": 1/86400
+    }
+    return value * (time_units[to_unit] / time_units[from_unit])
+
+# Streamlit UI
+st.title("Unit Converter")
+
+category = st.selectbox("Select Category", ["Length", "Weight", "Temperature", "Time"])
+
+if category == "Length":
+    units = ["meter", "kilometer", "centimeter", "millimeter", "mile", "yard", "foot", "inch"]
+    value = st.number_input("Enter Value", value=1.0)
+    from_unit = st.selectbox("From", units)
+    to_unit = st.selectbox("To", units)
+    if st.button("Convert"):
+        result = length_converter(value, from_unit, to_unit)
+        st.success(f"{value} {from_unit} = {result:.4f} {to_unit}")
+
+elif category == "Weight":
+    units = ["kilogram", "gram", "milligram", "pound", "ounce"]
+    value = st.number_input("Enter Value", value=1.0)
+    from_unit = st.selectbox("From", units)
+    to_unit = st.selectbox("To", units)
+    if st.button("Convert"):
+        result = weight_converter(value, from_unit, to_unit)
+        st.success(f"{value} {from_unit} = {result:.4f} {to_unit}")
+
+elif category == "Temperature":
+    units = ["Celsius", "Fahrenheit", "Kelvin"]
+    value = st.number_input("Enter Value", value=0.0)
+    from_unit = st.selectbox("From", units)
+    to_unit = st.selectbox("To", units)
+    if st.button("Convert"):
+        result = temperature_converter(value, from_unit, to_unit)
+        st.success(f"{value} {from_unit} = {result:.2f} {to_unit}")
+
+elif category == "Time":
+    units = ["second", "minute", "hour", "day"]
+    value = st.number_input("Enter Value", value=1.0)
+    from_unit = st.selectbox("From", units)
+    to_unit = st.selectbox("To", units)
+    if st.button("Convert"):
+        result = time_converter(value, from_unit, to_unit)
+        st.success(f"{value} {from_unit} = {result:.4f} {to_unit}")