[Tutor] Planning a program with algorithm?

[. ,]

I know how to write a prog.

But, I don't know how to plan a prog. with algorithm.

If algorithm of a part of a prog. is like..
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create an empty jumble word
while the chosen word has letters in it
    extract a random letter from the chosen word
    add the random letter to the jumble word
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It would be like..
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jumble = ""
while word:
    position = random.random(len(word))
    jumble += word[position]
    word = word[:position] + word[(position+1):]
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If the prog. is like..
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#Game List

list = ("GT4",
         "GTA Sanandreas",
         "Takken 5")

print "My Games: "
for i in list:
   print i

print "\nI've got", len(list), "games."

add = raw_input(\n\nAdd more games: ")
adding = (add)
list += adding

print "Total games are..."
print list

raw_input("exit.")
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What would the algorithm be for the prog.?

Any useful advice for algorithm would be appreciated.

Thanks.

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