CODEWITHSUNDEEP
python
Ray-Ray How
Ray-Ray How

Reputation: 23

How to enter a list into a function? in python

Write a function called “find_even_count” which allows the user to enter an arbitrary sequence of positive integers at the keyboard, and then prints the number of positive even integers user enters. The sequence of numbers is unknown at the beginning. User may enter negative number to show the end of the sequence. For example: If user enters the sequence, 1, 3, 5, 23, 56, 14, 68, 25, 12, -1 then your function needs to print “4 even numbers”, since there are 4 even numbers in the sequence. Hint: Use while loop

here is my code

find_even_count(x):
    i = x
    even_count = 0
    while x> 0:
            if i%2 ==0:
                    even_count+=1

    print even_count

I keep getting the error code

Traceback (most recent call last):
  File "<pyshell#8>", line 1, in <module>
    find_even_count(2,22,224,24,-1)
  File "/Users/rayhow/Desktop/assignment2_Q4.py", line 5, in find_even_count
    if i%2 ==0:
TypeError: unsupported operand type(s) for %: 'tuple' and 'int'

Why am I getting this error message?

Upvotes: 0

Views: 286

Answers (2)

brunsgaard
brunsgaard

Reputation: 5168

Here you go my friend

input_list = raw_input('give me list of numbers: ')
print(filter(lambda x: x.isdigit() and not int(x) % 2, input_list.split()))

will give you 

(ocmg)brunsgaard@archbook /tmp> python pos.py
give me list of numbers: 1 2 3 4 -2 -1 your mother 54
['2', '4', '54']

Also if you want a more simple solution go with 

even = lambda l: len([x for x in l if not x % 2 and x > 0])

This will output

even([1, -2, 3, 4, 6, 5])
2

Because there are 2 even numbers

Upvotes: 1

Tetramputechture
Tetramputechture

Reputation: 2921

def find_even_count(x):
    even_count = 0
    for n in x:
            if n%2 ==0:
                    even_count+=1

    print even_count

Upvotes: 0

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