Does this function built in in Python?

Question

considering the following code is there a function that take the odd indexed values and put it in array and the even to put it in another array then relate two arrays elements to each other in order to do some processing on it.

hm to run: ") if IN == '1':

 PN = input("   Enter each process time following by its arrival time separated by comma:")
        Ptimes = [] 
        Atimes = []

How is the code you have posted related to your question, if at all? — jonrsharpe
– jonrsharpe, Commented Apr 17, 2014 at 9:56
it's a part of the code that i am asking about sorry i will delete the extra useless code thanks for your note — user3541982
– user3541982, Commented Apr 17, 2014 at 9:59

Dima Tisnek · Accepted Answer · 2014-04-17 10:07:13Z

1

If you are used to zero-based arrays (index 0, index 1):

even = data[::2]  # even indices: 0, 2, 4, ...
odds = data[1::2]  # odd indices: 1, 3, 5, ...

If prefer to think in one-based arrays (1st element, 2nd element):

odds = data[::2]  # 1st element, 3rd element, ...
even = data[1::2]  # 2nd element, 4th element, ...

answered Apr 17, 2014 at 10:07

Dima Tisnek

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anon582847382 · Accepted Answer · 2014-04-17 10:16:45Z

1

You can get the values at even indices like this:

PN[::2]  # Start at 0, jump every two so 0, 2 etc.

and the ones at odd like this:

PN[1::2]  # Start at 1, jump every two so 1, 3 etc.

edited Apr 17, 2014 at 10:16

answered Apr 17, 2014 at 9:53

anon582847382

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7 Comments

user3541982 Over a year ago

does comma considered as an array element i mean i want to pass the comma and ignore it consider it an integer array or do i have to tell the user to separate numbers by a space instead of comma?

anon582847382 Over a year ago

@user3541982 I would just do it with spaces, and then just split() the input to get a list out of it.

jonrsharpe Over a year ago

@AlexThornton that gets the items at even/odd indices.

anon582847382 Over a year ago

@jonrsharpe I don't understand, he said in the question he wanted to 'get the odd-indexed values'.

jonrsharpe Over a year ago

@AlexThornton yes, that is what you give, but your description is "get the even indices"

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