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 one year ago
I need to create a program that counts the string "bob" inside another string, given by the user. The bobs can overlap. What is wrong with my code?
 one year ago
I need to create a program that counts the string "bob" inside another string, given by the user. The bobs can overlap. What is wrong with my code?

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osanseviero
 one year ago
Best ResponseYou've already chosen the best response.0http://dpaste.com/1431048/ How to make it work?

e.mccormick
 one year ago
Best ResponseYou've already chosen the best response.1Well, you are looking at characters, but trying to test for a string.

osanseviero
 one year ago
Best ResponseYou've already chosen the best response.0Changing to i wont make it work

e.mccormick
 one year ago
Best ResponseYou've already chosen the best response.1string.find(s, sub[, start[, end]]) Return the lowest index in s where the substring sub is found such that sub is wholly contained in s[start:end]. Return 1 on failure. Defaults for start and end and interpretation of negative values is the same as for slices. Loop or recurse until you find all copies. As you find one, advance how far you start in the string, or pass from just beyond if recursing.

osanseviero
 one year ago
Best ResponseYou've already chosen the best response.0I know I need to use slicing and ranges, but I dont know how to apply them in this

e.mccormick
 one year ago
Best ResponseYou've already chosen the best response.1All stringgs are arrays. Slicing is s[start:stop] basically. But you can use  numbers to go backwards.

osanseviero
 one year ago
Best ResponseYou've already chosen the best response.0s=raw_input("Enter a word: ") Bobs= 0 for i in range(len(s)): if s[i]=="b": if s[i+1]=="o": if s[i+2]=="b": Bobs +=1 print("Number of bobs: " + str(Bobs)) Why doesnt that work?

e.mccormick
 one year ago
Best ResponseYou've already chosen the best response.1The end is not inclided in the slice. ``` >>> s="This is a test" >>> s[1:] 'his is a test' >>> s[:5] 'This is a' >>> s[2:3] 'i' >>> ``` OK, let me look.

e.mccormick
 one year ago
Best ResponseYou've already chosen the best response.1You can end up testing more than exists. Your s[i+2]=="b": can go past the end of the string.

osanseviero
 one year ago
Best ResponseYou've already chosen the best response.0So how can i control it?

osanseviero
 one year ago
Best ResponseYou've already chosen the best response.0String index is out of range :/

e.mccormick
 one year ago
Best ResponseYou've already chosen the best response.1Yes. And how far are you going last the end in the middle of the loop?

e.mccormick
 one year ago
Best ResponseYou've already chosen the best response.1``` for i in range(len(s)): if s[i]=="b": if s[i+1]=="o": if s[i+2]=="b": # <== How much too far? Bobs +=1 ```

osanseviero
 one year ago
Best ResponseYou've already chosen the best response.0can this work? (and remember me with what can I paste code, please) s=raw_input("Enter a word: ") Bobs= 0 for i in range(len(s)): if i+2<=len(s): if s[i]=="b": if s[i+1]=="o": if s[i+2]=="b": Bobs +=1 print("Number of bobs: " + str(Bobs))

osanseviero
 one year ago
Best ResponseYou've already chosen the best response.0Forget it, same mistake :/

e.mccormick
 one year ago
Best ResponseYou've already chosen the best response.1Use ``` above and below the code block. I don't know if that can work, but there is a simpler way to solve it.

osanseviero
 one year ago
Best ResponseYou've already chosen the best response.0Yep...this worked...But how could I do this simpler?

e.mccormick
 one year ago
Best ResponseYou've already chosen the best response.1Look at what I asked about how much too far you are going. How far is it past the end of the string?

e.mccormick
 one year ago
Best ResponseYou've already chosen the best response.1Right. So, how could you change the range so that it goes 2 less?

osanseviero
 one year ago
Best ResponseYou've already chosen the best response.0so i could make the end of the range the leng  2

e.mccormick
 one year ago
Best ResponseYou've already chosen the best response.1Exactly. ``` #s=raw_input("Enter a word: ") s="This is a bob test for bob find bob" Bobs= 0 for i in range(len(s)2): if s[i]=="b": if s[i+1]=="o": if s[i+2]=="b": Bobs +=1 print("Number of bobs: " + str(Bobs)) ``` Number of bobs: 3

osanseviero
 one year ago
Best ResponseYou've already chosen the best response.0Oh... now I see :D

osanseviero
 one year ago
Best ResponseYou've already chosen the best response.0Thanks a lot :D Next problem set looks much harder

e.mccormick
 one year ago
Best ResponseYou've already chosen the best response.1You can also see one other good thing there for testing. Rather than enter a string each time, I just make a test string. That makes the trying out code faster.

osanseviero
 one year ago
Best ResponseYou've already chosen the best response.0Can you help me with the start of another one?

osanseviero
 one year ago
Best ResponseYou've already chosen the best response.0I will open a new question, thanks :)
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