Programming Forums > Script Programming > Python

goblin4u · Oct 9th, 2008, 6:16 PM

Hey, guys i am new to programming and i have an assignment to do and one of the things that they ask me to do is to remove the first occurrence from a list which contains two strings with out using any string methods, so that's where i am stuck.
Here is an example to see what i am talking about,

For example the given list = ("fffabcdefffg", "f"), and i have to make a program that returns "abcdefffg", so any help with this will be appreciated, sorry if this is confusing this is my first post

Sane · Oct 9th, 2008, 6:31 PM

Do you know how to loop through a string?

(Toggle Plain Text)

my_str = "fffabcdefffg"
for letter in my_str:
    print letter # This executes for each letter

Do you know how to build a string?

(Toggle Plain Text)

my_str = ''
my_str = my_str + 'a'
my_str = my_str + 'b'
my_str = my_str + 'c'
print my_str # Should print "abc"

Do you know how to use an if condition?

(Toggle Plain Text)

my_letter = 'a'
letter = 'a'

if letter == my_letter:
    print "Yes" # This executes if they match
else:
    print "No" # This executes if they do not

Do you know how to access the first and second item of a tuple?

(Toggle Plain Text)

lst = ("fffabcdefffg", "f")
print lst[0] # print the first item
print lst[1] # print the second item

Put all of these building blocks together logically, and you should have your code. Do a little experimentation. Try some stuff out. Post code that you think should work and then ask some questions about it.

goblin4u · Oct 9th, 2008, 6:52 PM

Thanks Sane i will try to do what you said and see if it works

goblin4u · Oct 9th, 2008, 7:47 PM

Hey Sane i tried to play around with it now i am stuck at the part where i have 2 strings
string1 = "aaabcdeabcd"
string2 = "a"
is there a code which allows me to skip string2 from string1?

Sane · Oct 9th, 2008, 9:08 PM

What do you mean by "skip"...?

goblin4u · Oct 9th, 2008, 10:03 PM

I mean just return string 1 without the "a" in it...

Sane · Oct 9th, 2008, 10:45 PM

Just think about it logically step by step. Write the Psuedocode (English explanation of the code), and then translate it to code using the examples I showed you. You can do the entire problem with those little bits of code plus some extra variable declarations. I'm not writing it for you, but I can answer questions if you ask me why your code doesn't work (which I have not seen any of, incidently).

Oct 9th, 2008, 6:16 PM	#1
goblin4u Newbie Join Date: Oct 2008 Posts: 4 Rep Power: 0	Deleting first occurrence in a list using Python Hey, guys i am new to programming and i have an assignment to do and one of the things that they ask me to do is to remove the first occurrence from a list which contains two strings with out using any string methods, so that's where i am stuck. Here is an example to see what i am talking about, For example the given list = ("fffabcdefffg", "f"), and i have to make a program that returns "abcdefffg", so any help with this will be appreciated, sorry if this is confusing this is my first post Last edited by goblin4u; Oct 9th, 2008 at 6:27 PM.

Oct 9th, 2008, 6:31 PM	#2
Sane Banned Join Date: Apr 2005 Location: Waterloo, Ontario Posts: 2,101 Rep Power: 6	Re: Deleting first occurrence in a list Do you know how to loop through a string? (Toggle Plain Text) my_str = "fffabcdefffg" for letter in my_str: print letter # This executes for each letter my_str = "fffabcdefffg" for letter in my_str: print letter # This executes for each letter Do you know how to build a string? (Toggle Plain Text) my_str = '' my_str = my_str + 'a' my_str = my_str + 'b' my_str = my_str + 'c' print my_str # Should print "abc" my_str = '' my_str = my_str + 'a' my_str = my_str + 'b' my_str = my_str + 'c' print my_str # Should print "abc" Do you know how to use an if condition? (Toggle Plain Text) my_letter = 'a' letter = 'a' if letter == my_letter: print "Yes" # This executes if they match else: print "No" # This executes if they do not my_letter = 'a' letter = 'a' if letter == my_letter: print "Yes" # This executes if they match else: print "No" # This executes if they do not Do you know how to access the first and second item of a tuple? (Toggle Plain Text) lst = ("fffabcdefffg", "f") print lst[0] # print the first item print lst[1] # print the second item lst = ("fffabcdefffg", "f") print lst[0] # print the first item print lst[1] # print the second item Put all of these building blocks together logically, and you should have your code. Do a little experimentation. Try some stuff out. Post code that you think should work and then ask some questions about it. __________________ Looking for tough programming challenges? Try participating in Sane's Monthly Algorithms Challenges! Composing Techno is a little side hobby of mine. Techno by DJ Sane. All free for download.

Oct 9th, 2008, 6:52 PM	#3
goblin4u Newbie Join Date: Oct 2008 Posts: 4 Rep Power: 0	Re: Deleting first occurrence in a list Thanks Sane i will try to do what you said and see if it works

Oct 9th, 2008, 7:47 PM	#4
goblin4u Newbie Join Date: Oct 2008 Posts: 4 Rep Power: 0	Re: Deleting first occurrence in a list Hey Sane i tried to play around with it now i am stuck at the part where i have 2 strings string1 = "aaabcdeabcd" string2 = "a" is there a code which allows me to skip string2 from string1?

Oct 9th, 2008, 9:08 PM	#5
Sane Banned Join Date: Apr 2005 Location: Waterloo, Ontario Posts: 2,101 Rep Power: 6	Re: Deleting first occurrence in a list What do you mean by "skip"...? __________________ Looking for tough programming challenges? Try participating in Sane's Monthly Algorithms Challenges! Composing Techno is a little side hobby of mine. Techno by DJ Sane. All free for download.

Oct 9th, 2008, 10:03 PM	#6
goblin4u Newbie Join Date: Oct 2008 Posts: 4 Rep Power: 0	Re: Deleting first occurrence in a list I mean just return string 1 without the "a" in it...

Oct 9th, 2008, 10:45 PM	#7
Sane Banned Join Date: Apr 2005 Location: Waterloo, Ontario Posts: 2,101 Rep Power: 6	Re: Deleting first occurrence in a list Just think about it logically step by step. Write the Psuedocode (English explanation of the code), and then translate it to code using the examples I showed you. You can do the entire problem with those little bits of code plus some extra variable declarations. I'm not writing it for you, but I can answer questions if you ask me why your code doesn't work (which I have not seen any of, incidently). __________________ Looking for tough programming challenges? Try participating in Sane's Monthly Algorithms Challenges! Composing Techno is a little side hobby of mine. Techno by DJ Sane. All free for download.

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Programming Forums > Script Programming > Python

Deleting first occurrence in a list