plotpy 0.1.1

Rust plotting library using Python (Matplotlib)
Documentation 
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// Converts an array to a string representing a Python list
pub(crate) fn array2list<T: std::fmt::Display>(values: &[T]) -> String {
    let mut result = "[".to_string();
    let mut first = true;
    for val in values.iter() {
        if !first {
            result.push_str(",");
        }
        result.push_str(&format!("'{}'", val));
        first = false;
    }
    result.push_str("]");
    result
}

/// Generates unique ID = key + "_" + buffer.len()
pub(crate) fn generate_uid(buffer: &str, key: &str) -> String {
    format!("{}_{}", key, buffer.len())
}

// Writes array to buffer an returns key = name + uid
pub(crate) fn write_array(buffer: &mut String, name: &str, array: &[f64]) -> String {
    let uid = generate_uid(buffer, name);
    buffer.push_str(&uid);
    buffer.push_str("=np.array([");
    for val in array.iter() {
        let v = format!("{:.15},", val);
        buffer.push_str(&v);
    }
    buffer.push_str("],dtype=float)\n");
    uid
}

// Writes arrays to buffer and returns key = name + uid for each array
pub(crate) fn write_arrays(
    buffer: &mut String,
    name_x: &str,
    name_y: &str,
    array_x: &[f64],
    array_y: &[f64],
) -> (String, String) {
    let uid_x = write_array(buffer, name_x, array_x);
    let uid_y = write_array(buffer, name_y, array_y);
    (uid_x, uid_y)
}

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn array2list_works() {
        let results = array2list(&[1.0, 2.0, 3.0]);
        assert_eq!(results, "['1','2','3']");
    }

    #[test]
    fn generate_uid_works() {
        let mut buffer = String::new();
        assert_eq!(generate_uid(&buffer, "x"), "x_0");
    }

    #[test]
    fn write_array_works() {
        let x = &[1.0, 2.0, 3.0, 4.0, 5.0];
        let mut buffer = String::new();
        let uid = write_array(&mut buffer, "x", x);
        assert_eq!(uid, "x_0");
        assert_eq!(buffer, "x_0=np.array([1.000000000000000,2.000000000000000,3.000000000000000,4.000000000000000,5.000000000000000,],dtype=float)\n");
    }

    #[test]
    fn write_arrays_works() {
        let x = &[1.0, 2.0, 3.0, 4.0, 5.0];
        let y = &[1.0, 4.0, 9.0, 16.0, 25.0];
        let mut buffer = String::new();
        let (uid_x, uid_y) = write_arrays(&mut buffer, "x", "y", x, y);
        assert_eq!(uid_x, "x_0");
        assert_eq!(uid_y, "y_119");
        assert_eq!(buffer, "x_0=np.array([1.000000000000000,2.000000000000000,3.000000000000000,4.000000000000000,5.000000000000000,],dtype=float)\ny_119=np.array([1.000000000000000,4.000000000000000,9.000000000000000,16.000000000000000,25.000000000000000,],dtype=float)\n");
    }
}