i need to count how many periods (points) appear in a string.
for example:
str="hellow.my.word."
the code should return 3.
I tried to use the following function but it returns the length of the string.
num=str.count('.')
What is the correct way to do it?
Use variable name other than str(str is built-in).
Secondly:
string = "hellow.my.word."
num=string.count('.') # num=3 ...THIS WORKS
Use a for comprehension to iterate over the string:
Also, don't use str as a variable name, it's a built-in function in python.
string="hellow.my.word."
sum([char == '.' for char in string]) # Returns 3
EDIT
Regarding @niemmi's comment, apparently this is possible using string.count('symbol'):
string.count('.') # returns 3
Docs: https://docs.python.org/2/library/string.html#string.count
str is certainly a callable it's not really a function. str is a type (IOW, a class), so when you call it it creates a new string instance.One possible solution is to filter out other characters than . and measure the length of resulting list:
len([1 for c in string if c == '.'])
len(re.findall("(\.)", my_string))