I am trying to figure out how I can count the uppercase letters in a string.
I have only been able to count lowercase letters:
def n_lower_chars(string): return sum(map(str.islower, string))
Example of what I am trying to accomplish:
Type word: HeLLo Capital Letters: 3
When I try to flip the function above, It produces errors:
def n_upper_chars(string): return sum(map(str.isupper, string))
Is there a way to convert a string from uppercase, or even part uppercase to lowercase?
E.g. Kilometers --> kilometers.
I'd like to capitalize the first letter of a
&str. It's a simple problem and I hope for a simple solution. Intuition tells me to do something like this:
let mut s = "foobar";s = s.to_uppercase();
&strs can't be indexed like this. The only way I've been able to do it seems overly convoluted. I convert the
&str to an iterator, convert the iterator to a vector, upper case the first item in the vector, which creates an iterator, which I index into, creating an
Option, which I unwrap to give me the upper-cased first letter. Then I convert the vector into an iterator, which I convert into a
String, which I convert to a
let s1 = "foobar";let mut v: Vec<char> = s1.chars().collect();v = v.to_uppercase().nth(0).unwrap();let s2: String = v.into_iter().collect();let s3 = &s2;
Is there an easier way than this, and if so, what? If not, why is Rust designed this way?
How to change the specified line to uppercase in vim?For example,i want to change the lines from 5th till 10th to uppercase.
ex mode ,
5,10gUU can't work.
This question already has an answer here:
Does anyone know a function that quickly canges the first letter of a
String to uppercase?sonething where you could go
let newfoo = first_letter_to_uppper_case("foobar".to_string()) or
let newfoo = "foobar".to_string().first_letter_to_uppper_case()