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# Motivation for dictionaries
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#----------------------------------------------------------------------
# WITHOUT DICTIONARIES
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# Remember Lab 1?  We did something like the following:

def Process (Name,Score):
    # Do something fun with Name and Score, like:
    print (Name, Score)
    return

def Main1():
    Process("Fred",78)
    Process("Sam",34)
    Process("Mary",98)
    Process("Tom",57)
    return

# This is not an efficient approach, because
# each name and score is "burned in" to the
# program.  Here's a solution that separates
# out the data a little more cleanly, then
# the code to run through all the data is more
# efficient and much more general:

def Main2():
    Data = [["Fred",78],["Sam",34],["Mary",98],["Tom",57]]
    Index = 0
    while (Index < len(Data)):
        Student = Data[Index]                   # A list of a name and a score
        Process(Student[0],Student[1])
        Index = Index + 1
    return

# Here's a different way of doing the same thing, since
# we really don't need to know *where* in Data each student
# is located:

def Main3():
    Data = [["Fred",78],["Sam",34],["Mary",98],["Tom",57]]
    for Student in Data:
        Process(Student[0],Student[1])
    return

# But what about searching?  Here's one approach:

def Main4():
    Data = [["Fred",78],["Sam",34],["Mary",98],["Tom",57]]
    Search = input("Enter a student name --- ")
    Index = 0
    Found = False
    while (Index < len(Data)) and not Found:    # Same as: ...and Found == False
        Student = Data[Index]
        if Search == Student[0]:
            print (Student[1])
            Found = True                        # Stop the loop because we found a match
        else:
            Index = Index + 1                   # Otherwise go to the next item to compare
    return

# Here's a better search:

def Main5():
    Data = [["Fred",78],["Sam",34],["Mary",98],["Tom",57]]
    Search = input("Enter a student name --- ")
    for Student in Data:
        if Search == Student[0]:
            print (Student[1])
            break                               # Stops the loop
    return

#----------------------------------------------------------------------
# WITH DICTIONARIES (See: Companion page 250)
#----------------------------------------------------------------------

def Main6():
    Data = {"Fred":78, "Sam":34, "Mary":98, "Tom":57}
    Search = input("Enter a student name --- ")
    if Search in Data:
        print (Data[Search])
    return
    
def Main7():
    Data = {"Fred":78, "Sam":34, "Mary":98, "Tom":57}
    for Name in Data.keys():
        Process (Name, Data[Name])
    return
    
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