# -*- coding: utf-8 -*-
"""
Created on Wed Nov  2 10:58:19 2022

@author: cpresser
"""

#Example problems?
import math

#default argument for x is 0
def times2(x=0):
    """
    times2: multiply argument times 2

    Parameters
    ----------
    x : float or int
        Some numeric value.

    Returns
    -------
    float or int
        argument times 2.

    """
    return x*2

#default arguments 
#if x is not listed, use the default argument
print(times2())


numbers = [4, 2, 6.3, 6]

for v in map(times2, numbers):
    print(v)

#create a list from the map
newNumbers = list(map(math.sin, numbers))
print(newNumbers)

otherNumbers = [times2(x) for x in numbers]
print(otherNumbers)

#if/elif/else
grade = 93
letter = "not assigned"
if grade >= 90:
    letter = "A"
elif grade >= 80:
    letter = "B"
elif grade >= 70:
    letter = "C"
elif grade >= 60:
    letter = "D"
else:
    letter = "F"
    
print(letter)

#list slicing
values = [2, 4, 5, 1, 7, 9, 2, 5]
#specify start index and end (exclusive), and step
valueSlice = values[3:8:2]
print(valueSlice)

nestedList = [
    [2, 5, 3],
    [6, 8, 2],
    [9, 4, 1],
    [6, 2, 7, 6]
    ]

dataSlice = nestedList
print(dataSlice)

dataSlice = nestedList[1:3]
print(dataSlice)

dataSlice = nestedList[1:3][0]  #this is a list
print(dataSlice)

dataSlice = nestedList[1:3][0][1] #this is an item
print(dataSlice)


#iterate through a nested list
for l in nestedList:  # l is a list
    for v in l:  # v is a value in l
        print(f"value = {v}")
        
#use indices - have access to the location of the value
for row in range(len(nestedList)): # row is an index
    for col in range(len(nestedList[row])): # col is an index 
        print(f"Value at {row}, {col} = {nestedList[row][col]}");