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Python Python Basics (2015) Python Data Types Index

Posted by mendelbakaleynik
mendelbakaleynik
1,009 Points

Question regarding... well.. stuff.

I'm a little confused by what Kenneth wrote at around 2:30. He had so far written

>>> alpha_list = list(alpha)                                                      
>>> alpha_list.index('b')                                                         
1                                                                                 
>>> alpha.index('d')                                                              
3                                                                                 
>>> 'abcabc'.index('a')                                                           
0           
>>> alpha_list = list(alpha)                                                      
>>> alpha_list.index('b')                                                         
1

I was confused by the last two lines. particularly this one,

>>> alpha_list = list(alpha)

I thought he had already defined "alpha" earlier on? What is he doing now, and why is the value for 'b' 1? If he changed the definition for 'alpha' then there is no letter 'b' anywhere.

I'm missing something obvious, but thanks anyway.

3 Answers

Carlos Federico Puebla Larregle
Carlos Federico Puebla Larregle
21,074 Points
Carlos Federico Puebla Larregle
Carlos Federico Puebla Larregle
21,074 Points

You have to see it like this:

1) We have a variable called "alpha" and it holds a String

alpha = 'abcde'

this one is a string: 'abcde'

2) Then later on the video he creates a new variable called "alpha_list" that is going to hold the "list" version of the string placed in the variable "alpha".

alpha_list = list(alpha)

this one is a list: ['a', 'b', 'c', 'd', 'e']

I hope that helps a little bit.

mendelbakaleynik
mendelbakaleynik
1,009 Points
mendelbakaleynik
mendelbakaleynik
1,009 Points

Actually, I spent some more time banging my head against a wall and I solved this answer right as you posted it. But thanks so much anyway! I'm glad to know I have support.

James Brazil
James Brazil
390 Points
James Brazil
James Brazil
390 Points

anyone still having trouble

'''

creating the varible alpha

        >>>alpha="abcde"

index for the variable alpha

        >>>alpha.index("a")

       0

creating a new variable making a list of the word "alpha"

         >>>alpha_list=list(alpha)

what list.alpha looks like

      >>>print(alpha_list)
    {"a", "b", "c", "d", "e"]

so when you put alpha_list.index("b") python finds the b from the list of alpha that you created

'''