#!/usr/bin/env python

"""

Chris' solutions to the list lab

A couple take-home concepts:

If you need to delete stuff from the list when looping through it,

make a copy ([:]) first.

You almost never want to loop through a sequence by doing:

for i in range(len(seq)):

...

if you don't need the index, simply do:

for item in seq:

...

If you need both the item and the index, use enumerate():

for i, item in enumerate(seq):

...

If you need to loop through more than one list at once, use zip():

for item1, item2 in zip(list1, list2):

...

"""

# Task 1

fruits = ["Apples", "Pears", "Oranges", "Peaches"]

print fruits

new = raw_input("type a fruit to add> ")

fruits.append(new)

print fruits

ind = int(raw_input("give me an index> "))

print "you selected fruit number: %i, which is %s"%(ind, fruits[ind-1])

print fruits

fruits.insert(0, 'Kiwi')

print fruits

print "All the P fruits"

for fruit in fruits:

if fruit[0].lower() == 'p':

print fruit

# make a new list with duplicated entries - to test removal

d_fruits = fruits * 2

print " All the fruits are:", fruits

ans = raw_input("Which fruit would you like to delete? ")

while ans in d_fruits:

d_fruits.remove(ans)

print d_fruits

## another way to do that:

## This one only requires looping through list once

d_fruits = []

for fruit in fruits * 2:

if fruit != ans:

d_fruits.append(fruit)

print d_fruits

# keep a copy around for next step

orig_fruits = fruits[:]

for fruit in fruits:

ans = raw_input("Do you like: %s? "%fruit)

if ans[0].lower() == 'n': # so they could answer y or Y or yes or Yes...

while fruit in fruits: # just in case there are duplicates

fruits.remove(fruit)

elif ans[0].lower() == 'y':

pass

else:

print "please answer yes or no next time!"

# Note: I could be smarter about re-asking here,

# but that's not the point of this excercise...

print "here they are with only the ones you like"

print fruits

fruits = orig_fruits[:] # makes a copy

# option 1: build up a copy one by one:

r_fruits = []

for fruit in fruits:

r_fruits.append(fruit[::-1])

print "here they are reversed"

print r_fruits

# option 2: make a copy, then modify in place:

r_fruits = fruits[:]

for i, fruit in enumerate(r_fruits):

r_fruits[i] = fruit[::-1]

print r_fruits