2 replies to this topic

[jpd750]

Keep in mind, I am VERY new to python. Im trying to do this:

There is a string method called 'count'. Write an invocation that counts the number of 'a's in banana.

How do I do the above syntactically in python.

Thanks

[ShadowMage]

Heres how you would do it. You would want to use the list function to make the letters list, then you could count.

wordlist = list("banana")

That will assign the variable wordlist to be an array, and that array will have all the letters in banana.

To count how many there are now, you could do:

print wordlist.count("a")

and that should output 3.

Hope this helps.

[fedekun]

I think you will be able to understand this

>>> def count(str, letter):
	c = 0
	for word in str:
		if word == letter:
			c += 1
	return c

>>> count("banana", "a")

But you can also do this

>>> "banana".count("a")

So you could rewrite it as

>>> def count(str, letter):
	return str.count(letter)

>>> count("banana", "a")

Edited by fedekun, 21 December 2009 - 12:52 AM.