How to find specific element in a list with theri relative position? Python-CodePudding

My list contains several strings. I want to get the next element after the element, which equals to "PlayStation". How should I do that?

list_ = ['PlayStation', '9th Sep 1995 (USA)29th Sep 1995 (UK/EU)28th Apr 1995 (JPN)',  'PlayStation Network', '3rd May 2007 (USA), $5.9922nd Jun 2007 (UK/EU), £3.99', '']
[element.next() for element in list_ if element == 'PythonStation']

I tried to achieve that by using comprehension. But it returns as [].

CodePudding user response：

Solution if `"PlayStation"` always occurs exactly once

Since you're looking for the position of an element, you should use index():

list_[list_.index("PlayStation") 1]

That will work if you're expecting to find exactly one instance of "PlayStation" in list_.

Solution for multiple instances

If there might be several instances and you want the element after each instance, this comprehension will do that for you:

[y for x, y in zip(list_, list_[1:]) if x == "PlayStation"]

Here I'm using zip() to loop through pairs of each element and its successor, and printing the successor y if the element x is "PlayStation".

CodePudding user response：

Assuming that I understood the question correctly and that there zero or one "PlayStation" string in your list.

list_ = ['PlayStation', '9th Sep 1995 (USA)29th Sep 1995 (UK/EU)28th Apr 1995 (JPN)',  'PlayStation Network', '3rd May 2007 (USA), $5.9922nd Jun 2007 (UK/EU), £3.99', '']
if "PlayStation" in list_:
    index = list_.index("PlayStation")
    if index < len(list) - 1 : # if "PlayStation" is found before at the last index
        print(index 1)
    else: # "PlayStation" is found at the last index no more element after this
        print(index)
else:
    print("No match found")

for one or more "PlayStation" string in list_

while "PlayStation" in list_:
    index = list_.index("PlayStation")
    if index < len(list) - 1 : # if "PlayStation" is found before at the last index
        print(index 1)
    else: # "PlayStation" is found at the last index no more element after this
        print(index)
    list_ = list_[index:] #update the list to check for "PlayStation" after index in `list_`

Solution if "PlayStation" always occurs exactly once

Solution for multiple instances

Solution if `"PlayStation"` always occurs exactly once