如何访问函数python中的字符串？

Question

Trying to gain access to this string to test it if it has 3 or more blues "b" inside of it. ---Both test and three_or_more_blues are functions.----- I'm completely lost, any one got an idea? Please change my title if it doesn't fit my question. Not sure really how to ask the question. Thanks!

test(three_or_more_blues, "brrrrrbrrrrrb")

Answer 1

You could use .count().

sentence = 'brrrrrbrrrrrb'
amount = sentence.count('b')
print(amount)

And then you could use a loop to calculate your next step.

if (amount >= 3): 
    # Do something

Answer 2

Assuming test is a function that takes a function and a string as paramters, and three_or_more_blues is a function that returns true if its string parameter has 3 or more 'b' characters, then

def test(func, str):
    if func(str):
        # do something with str

test(three_or_more_blues, "brrrrrbrrrrrb")

Answer 3

I am not sure if I understand you correctly - you are asking how to pass the string 'brrrrrbrrrrrb' to the three_or_more_blues function?

If that is the case, than you just simply pass it when you call the three_or_more_blues function like this:

def test(func, some_string):
    func(some_string)  # here you call the passed function

# if three_or_more_blues would look like this:
def three_or_more_blues(some_string):
    print "Yes, 3 or more b's" if some_string.count('b') >= 0 else "No"

# you would get this from your function call
test(three_or_more_blues, "brrrrrbrrrrrb")  # prints: "Yes, 3 or more b's"