Question

Rules:

You may NOT use the following built-in functions.

sort()

sum()

max()

min()

Except for

format()

all string methods are banned. Except for append() and extend()

all list methods are banned. You may not import any module.

Make sure to test your code with a variety of inputs. Do not assume the examples in these directions are reflective of the hidden test cases.

Part 3 Echo (5 Points)

Write a function called echo that takes as argument a list and returns a copy of that list with each element duplicated right after it.

Here are some examples of how your program should behave on Python IDLE.

>>> echo(['a','b','c'])

['a','a','b','b','c','c']

>>> echo(['x','y'])

['x','x','y','y']

>>> echo([85,72,61])

[85,85,72,72,61,61]

>>> echo([85,"abc",6.79])

[85,85,'abc','abc',6.79,6.79]

Answer 1

['a', 'a', 'b', 'b', 'c', 'c'] ['x', 'x', 'y', 'y'] [85, 85, 72, 72, 61, 61] [85, 85, 'abc', 'abc', 6.79, 6.79] main.py B saved 1 def echo(1): res = [] #loop through each value in list for value in 1: #append the value two times in resultant list res.append(value) res.append(value) return res 11 print(echo(['a','b','c'])) print(echo(['x', 'y'])) print(echo([85,72,61])) print(echo([85,"abc", 6.79]))

code:

def echo(l):

res = []

#loop through each value in list

for value in l:

#append the value two times in resultant list

res.append(value)

res.append(value)

return res

print(echo(['a','b','c']))

print(echo(['x','y']))

print(echo([85,72,61]))

print(echo([85,"abc",6.79]))