CODEWITHSUNDEEP
pythonstringinputtype-conversion
karun_r
karun_r

Reputation: 183

How to create a list with strings and integers as its elements?

This sounds so simple, but I cannot find anything on how to do this on the internet. I've gone through documentation but that didn't help me.

I have to get inputs from the user to create a list. This is what I am using right now.

t = raw_input("Enter list items: ")
l = map(str,t.split())

But this is converting every element into a string. If I use int in map function, then every element would be converted to int.

What should I do? Is there any other function that I am missing?

Upvotes: 0

Views: 263

Answers (2)

Joel
Joel

Reputation: 23827

use try/except. Try to make it an int. If that fails, leave it as a string.

def operation(str):
    try:
        val = int(str)
    except ValueError:
        val = str
    return val

t = raw_input("Enter list items: ")
l = map(operation,t.split())

print l

You can use a list comprehension rather than map for more "pythonic" code:

t = raw_input("Enter list items: ")
l = [operation(x) for x in t.split()]

Edit: I like iCodez's better... the isDigit test is nicer than try except.

Upvotes: 1

user2555451
user2555451

Reputation:

You can use a list comprehension to only call int on the strings which contain nothing but numerical characters (this is determined by str.isdigit):

t = raw_input("Enter list items: ")
l = [int(x) if x.isdigit() else x for x in t.split()]

Demo:

>>> t = raw_input("Enter list items: ")
Enter list items: 1 hello 2 world
>>> l = [int(x) if x.isdigit() else x for x in t.split()]
>>> l
[1, 'hello', 2, 'world']
>>>

Upvotes: 1

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