# -*- coding: utf-8 -*-
"""
Created on Fri Sep 16 11:08:44 2022

@author: cpresser
"""

grades = [70, 75, 90, 86, 93, 72]
print(grades)

#delete
del grades[2]
print(grades)

#another delete
grades.pop(2)  #remove an item at an index
print(grades)

#remove a value
grades.remove(70) #removing a specified value
print(grades)

grades.append(75)
print(grades)

grades.remove(75) #remove the first 75
print(grades)

#a string
className = "Scientific Computing"
print(className[0])
#Can't assign an item in a string
# className[0] = "T"
print(className[0])

grades = grades + [97, 83, 79, 91]
print(grades)
print(f"There are {len(grades)} grades in the list.")

#average the grades
n = 0
sum = 0
while n < len(grades): #7
    sum = sum + grades[n]
    #step
    n = n + 1

avg = sum/len(grades) 

print(f"The average is {avg:.4}.")   
print(f"The average is {avg:.4f}.")  

#for loops
#print the values
# for each value, g, in grades
for g in grades:
    #print the value
    print(g)

#calculate the average using a for loop
sum = 0
for g in grades: #put the next grade into variable g
    sum = sum + g
    
avg = sum/len(grades) 

print(f"The average is {avg:.4}.")

#reverse the list
grades.reverse()
print(grades)

#sort the list of grades.
grades.sort()
print(grades)

#loop through the characters in a string
for c in "Hello":
    print(c)