CODEWITHSUNDEEP
pythonlist
Geet
Geet

Reputation: 2575

How to create a list from another list using specific criteria in Python?

How can I create a list from another list using python? If I have a list:

input = ['a/b', 'g', 'c/d', 'h', 'e/f']

How can I create the list of only those letters that follow slash "/" i.e.

desired_output = ['b','d','f']

A code would be very helpful.

Upvotes: 5

Views: 1243

Answers (5)

Benjamin
Benjamin

Reputation: 2286

>>>  input = ["a/b", "g", "c/d", "h", "e/f"]
>>>  output=[]
>>>  for i in input:
         if '/' in i:
             s=i.split('/')
             output.append(s[1])

>>>  output
['b', 'd', 'f']

Upvotes: 1

nitishagar
nitishagar

Reputation: 9413

Simple one-liner could be to:

>> input = ["a/b", "g", "c/d", "h", "e/f"]
>> list(map(lambda x: x.split("/")[1], filter(lambda x: x.find("/")==1, input)))
Result: ['b', 'd', 'f']

Upvotes: 1

Ozgur Vatansever
Ozgur Vatansever

Reputation: 52163

With regex:

>>> from re import match
>>> input = ['a/b', 'g', 'c/d', 'h', 'e/f', '/', 'a/']
>>> [m.groups()[0] for m in (match(".*/([\w+]$)", item) for item in input) if m]
['b', 'd', 'f']

Upvotes: 2

Mohammed Elmahgiubi
Mohammed Elmahgiubi

Reputation: 641

If you fix your list by having all strings encapsulated by "", you can then use this to get what you want.

input = ["a/b", "g", "c/d", "h", "e/f"]

output = []
for i in input:
    if "/" in i:
        output.append(i.split("/")[1])

print output
['b', 'd', 'f']

Upvotes: 0

vks
vks

Reputation: 67968

You probably have this input.You can get by simple list comprehension.

input = ["a/b", "g", "c/d", "h", "e/f"]
print [i.split("/")[1] for i in input if i.find("/")==1 ]

or 

print [i.split("/")[1] for i in input if "/" in i ]

Output: ['b', 'd', 'f']

Upvotes: 7

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