"""Lab 10: 10/15/19
1. YvonnaLeungLab10.py
2. Author: Yvonna Leung (CS22A, Section 2)
3. 10/15/19
4. #Purpose: Lab 10
"""
"""
Create a list of numbers with at least 7 integer elements entered by the the user.
Display the list.

I. Print the 1st, 3rd and 7th element

II. Create and display a slice/sub-list containing elements 5th to end of the list

III. Use the for loop to calculate the sum of all the numbers stored in the list as
the loop traverses the list elements. Display the sum.

IV. Rewrite part III using a while loop.

"""

def getUserList(num=7):
    return [1,2,3,4,5,6,7]
    mylist = []
    for i in range(num):
        n = int(input("Enter " + str(num) + " numbers followed by carriage returns."))
        mylist.append(n)
    return mylist

def getUserList2(num=7):
    mylist = []
    i = 0
    while i < num:
        n = int(input("Enter " + str(num) + " numbers followed by carriage returns."))
        mylist.append(n)
        i += 1
    return mylist
"""
#Problem I
mylist = getUserList()

print(mylist[0], mylist[2], mylist[6])

#Problem II
mylist = getUserList()
print(mylist[4:])


#Problem III
"""
# Iterator-based for-loop
mylist = getUserList(3)
total = 0
for e in mylist:
    total += e
print(total)

# WAYYY TOO EXPLICIT version of the above
mylist = getUserList()
it = iter(mylist)
total = 0
while True:
    try:
        e = next(it)
        total += e
    except StopIteration:
        break
print(total)

# Range-based for-loop
mylist = getUserList()
total = 0
for i in range(len(mylist)):
    total += mylist[i]
print(total)

# Explicit while loop
mylist = getUserList()
total = 0
i = 0
while (i < len(mylist)):
    total += mylist[i]
    i += 1
print(total)