Python is this a string or a string array?

Question

I am trying to convert a Python program into C#. I do not understand what is being done here.

def mrF(alg, times = 1):
    if ((times % 2) == 0):
        return alg
    else:
        if (alg == 'R'):
            return "L'"
        if (alg[0] == 'G'):
            return alg
        if (alg[-1] == "'"):
            return alg[:-1]
        elif (alg[-1] == '2'):
            return alg
        else:
            return (alg + "'")

Is alg a string or a string array or a list?

FWIW, that's very unpythonic python. No need for any of those parentheses — Eric
– Eric, Commented Nov 11, 2012 at 15:05
@Eric Quite true. Also, replacing, for instance, alg[0] == 'G' with alg.startswith('G') would be more readable. And then there's the cryptic names alg and mrF, and the fact that this function's purpose is opaque and yet it is uncommented... — Mark Amery
– Mark Amery, Commented Nov 11, 2012 at 15:15

Rohit Jain · Accepted Answer · 2012-11-11 15:11:37Z

4

Its a string. You can use a subscript operator on strings in Python, which I assume is the only part in your code, that made you to post it as question.

>>> "rohit"[0]
'r'
>>> "rohit"[-1]
't'
>>> "rohit"[0:2]
'ro'

Its similar to the way you access indices in lists.

edited Nov 11, 2012 at 15:11

answered Nov 11, 2012 at 14:55

Rohit Jain

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5 Comments

MasterMastic Over a year ago

Probably worth mentioning you can do it in C# too (however it's not that flexible) Console.WriteLine("Hi!"[1]);

Rohit Jain Over a year ago

@Ken.. Actually, I don't have any idea about C#. But thanks for mentioning that. :)

Aivan Monceller Over a year ago

That was a quick one, I have read list stuff on Python. didn't know this could be applied on strings. Thanks! @Ken , I am not aware I could do that. got to check How I could do [:::] in C#

MasterMastic Over a year ago

@AivanMonceller Do you mean to get a range of characters with the '[] operator'?

poke Over a year ago

@AivanMonceller You can use String.Substring.

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